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Fix debuginfo__new() to set the build-id to dso before
dso__read_binary_type_filename() so that it can find
DSO_BINARY_TYPE__BUILDID_DEBUGINFO debuginfo correctly.
However, this may not change the result, because elfutils (libdwfl) has
its own debuginfo finder. With/without this patch, the perf probe
correctly find the debuginfo file.
This is just a failsafe and keep code's sanity (if you use
dso__read_binary_type_filename(), you must set the build-id to the dso.)
Reported-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Masami Hiramatsu <mhriamat@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Stefan Liebler <stli@linux.ibm.com>
Cc: Sven Schnelle <svens@linux.ibm.com>
Link: http://lore.kernel.org/lkml/162532651863.393143.11692691321219235810.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes in these csets:
64c2c2c62f92339b ("quota: Change quotactl_path() systcall to an fd-based one")
65ffb3d69ed3da28 ("quota: Wire up quotactl_fd syscall")
That silences these perf build warnings and add support for those new
syscalls in tools such as 'perf trace'.
For instance, this is now possible:
# perf trace -v -e quota*
event qualifier tracepoint filter: (common_pid != 158365 && common_pid != 2512) && (id == 179 || id == 443)
^C#
That is the filter expression attached to the raw_syscalls:sys_{enter,exit}
tracepoints.
$ grep quota tools/perf/arch/x86/entry/syscalls/syscall_64.tbl
179 common quotactl sys_quotactl
443 common quotactl_fd sys_quotactl_fd
$
This addresses these perf build warnings:
Warning: Kernel ABI header at 'tools/include/uapi/asm-generic/unistd.h' differs from latest version at 'include/uapi/asm-generic/unistd.h'
diff -u tools/include/uapi/asm-generic/unistd.h include/uapi/asm-generic/unistd.h
Warning: Kernel ABI header at 'tools/perf/arch/x86/entry/syscalls/syscall_64.tbl' differs from latest version at 'arch/x86/entry/syscalls/syscall_64.tbl'
diff -u tools/perf/arch/x86/entry/syscalls/syscall_64.tbl arch/x86/entry/syscalls/syscall_64.tbl
Warning: Kernel ABI header at 'tools/perf/arch/powerpc/entry/syscalls/syscall.tbl' differs from latest version at 'arch/powerpc/kernel/syscalls/syscall.tbl'
diff -u tools/perf/arch/powerpc/entry/syscalls/syscall.tbl arch/powerpc/kernel/syscalls/syscall.tbl
Warning: Kernel ABI header at 'tools/perf/arch/s390/entry/syscalls/syscall.tbl' differs from latest version at 'arch/s390/kernel/syscalls/syscall.tbl'
diff -u tools/perf/arch/s390/entry/syscalls/syscall.tbl arch/s390/kernel/syscalls/syscall.tbl
Warning: Kernel ABI header at 'tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl' differs from latest version at 'arch/mips/kernel/syscalls/syscall_n64.tbl'
diff -u tools/perf/arch/mips/entry/syscalls/syscall_n64.tbl arch/mips/kernel/syscalls/syscall_n64.tbl
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes from:
Fixes: 4ca9b3859dac14bb ("mm/madvise: introduce MADV_POPULATE_(READ|WRITE) to prefault page tables")
That result in these changes in the tools:
$ tools/perf/trace/beauty/madvise_behavior.sh > before
$ cp include/uapi/asm-generic/mman-common.h tools/include/uapi/asm-generic/mman-common.h
$ tools/perf/trace/beauty/madvise_behavior.sh > after
$ diff -u before after
--- before 2021-07-05 14:30:15.167212621 -0300
+++ after 2021-07-05 14:30:26.638462594 -0300
@@ -18,6 +18,8 @@
[19] = "KEEPONFORK",
[20] = "COLD",
[21] = "PAGEOUT",
+ [22] = "POPULATE_READ",
+ [23] = "POPULATE_WRITE",
[100] = "HWPOISON",
[101] = "SOFT_OFFLINE",
};
$
I.e. now when madvise gets those behaviours as args, it will be able to
translate from the number to a human readable string.
This addresses the following perf build warning:
Warning: Kernel ABI header at 'tools/include/uapi/asm-generic/mman-common.h' differs from latest version at 'include/uapi/asm-generic/mman-common.h'
diff -u tools/include/uapi/asm-generic/mman-common.h include/uapi/asm-generic/mman-common.h
Cc: David Hildenbrand <david@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Picking the changes from:
2e290c8d8d29278b ("drm: document minimum kernel version for DRM_CLIENT_CAP_*")
bbf4627ba6415711 ("drm: clarify and linkify DRM_CLIENT_CAP_WRITEBACK_CONNECTORS docs")
88938bf343efbc4d ("drm: reference mode flags in DRM_CLIENT_CAP_* docs")
Silencing these perf build warnings:
Warning: Kernel ABI header at 'tools/include/uapi/drm/drm.h' differs from latest version at 'include/uapi/drm/drm.h'
diff -u tools/include/uapi/drm/drm.h include/uapi/drm/drm.h
No changes in tooling as these are just C comment documentation changes.
Cc: Simon Ser <contact@emersion.fr>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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To pick the changes in:
2459e56fd8af0b47 ("drm/i915/uapi: implement object placement extension")
ebcb40298947bdb0 ("drm/i915/uapi: introduce drm_i915_gem_create_ext")
710217292a61110a ("drm/i915/query: Expose memory regions through the query uAPI")
e3bdccafb5bcfab2 ("drm/i915/uapi: convert i915_query and friend to kernel doc")
19d053d477a14506 ("drm/i915/uapi: convert i915_user_extension to kernel doc")
2ef6a01fb636997b ("drm/i915/uapi: fix kernel doc warnings")
That picks a new ioctl:
$ tools/perf/trace/beauty/drm_ioctl.sh > before
$ cp include/uapi/drm/i915_drm.h tools/include/uapi/drm/i915_drm.h
$ tools/perf/trace/beauty/drm_ioctl.sh > after
$ diff -u before after
--- before 2021-07-05 14:25:13.247680316 -0300
+++ after 2021-07-05 14:25:22.454874111 -0300
@@ -166,4 +166,5 @@
[DRM_COMMAND_BASE + 0x39] = "I915_QUERY",
[DRM_COMMAND_BASE + 0x3a] = "I915_GEM_VM_CREATE",
[DRM_COMMAND_BASE + 0x3b] = "I915_GEM_VM_DESTROY",
+ [DRM_COMMAND_BASE + 0x3c] = "I915_GEM_CREATE_EXT",
};
$
Addressing this perf build warning:
Warning: Kernel ABI header at 'tools/include/uapi/drm/i915_drm.h' differs from latest version at 'include/uapi/drm/i915_drm.h'
diff -u tools/include/uapi/drm/i915_drm.h include/uapi/drm/i915_drm.h
Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Picking the changes from:
08fdced60ca08e34 ("ALSA: rawmidi: Add framing mode")
Which entails no changes in the tooling side as it doesn't introduce new
ioctls.
To silence this perf tools build warning:
Warning: Kernel ABI header at 'tools/include/uapi/sound/asound.h' differs from latest version at 'include/uapi/sound/asound.h'
diff -u tools/include/uapi/sound/asound.h include/uapi/sound/asound.h
Cc: David Henningsson <coding@diwic.se>
Cc: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Recently bperf was added to use BPF to count perf events for various
purposes. This is an extension for the approach and targetting to
cgroup usages.
Unlike the other bperf, it doesn't share the events with other
processes but it'd reduce unnecessary events (and the overhead of
multiplexing) for each monitored cgroup within the perf session.
When --for-each-cgroup is used with --bpf-counters, it will open
cgroup-switches event per cpu internally and attach the new BPF
program to read given perf_events and to aggregate the results for
cgroups. It's only called when task is switched to a task in a
different cgroup.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210701211227.1403788-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Current 'perf report' fails to process a pipe input when --task or
--stat options are used. This is because they reset all the tool
callbacks and fails to find a matching event for a sample.
When pipe input is used, the event info is passed via ATTR records so it
needs to handle that operation. Otherwise the following error occurs.
Note, -14 (= -EFAULT) comes from evlist__parse_sample():
# perf record -a -o- sleep 1 | perf report -i- --stat
Can't parse sample, err = -14
0x271044 [0x38]: failed to process type: 9
Error:
failed to process sample
#
Committer testing:
Before:
$ perf record -o- sleep 1 | perf report -i- --stat
Can't parse sample, err = -14
[ perf record: Woken up 1 times to write data ]
0x1350 [0x30]: failed to process type: 9
Error:
failed to process sample
[ perf record: Captured and wrote 0.000 MB - ]
$
After:
$ perf record -o- sleep 1 | perf report -i- --stat
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.000 MB - ]
Aggregated stats:
TOTAL events: 41
COMM events: 2 ( 4.9%)
EXIT events: 1 ( 2.4%)
SAMPLE events: 9 (22.0%)
MMAP2 events: 4 ( 9.8%)
ATTR events: 1 ( 2.4%)
FINISHED_ROUND events: 1 ( 2.4%)
THREAD_MAP events: 1 ( 2.4%)
CPU_MAP events: 1 ( 2.4%)
EVENT_UPDATE events: 1 ( 2.4%)
TIME_CONV events: 1 ( 2.4%)
FEATURE events: 19 (46.3%)
cycles:uhH stats:
SAMPLE events: 9
$
Fixes: a4a4d0a7a2b20f78 ("perf report: Add --stats option to display quick data statistics")
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210630043058.1131295-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Pull RCU updates from Paul McKenney:
- Bitmap parsing support for "all" as an alias for all bits
- Documentation updates
- Miscellaneous fixes, including some that overlap into mm and lockdep
- kvfree_rcu() updates
- mem_dump_obj() updates, with acks from one of the slab-allocator
maintainers
- RCU NOCB CPU updates, including limited deoffloading
- SRCU updates
- Tasks-RCU updates
- Torture-test updates
* 'core-rcu-2021.07.04' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu: (78 commits)
tasks-rcu: Make show_rcu_tasks_gp_kthreads() be static inline
rcu-tasks: Make ksoftirqd provide RCU Tasks quiescent states
rcu: Add missing __releases() annotation
rcu: Remove obsolete rcu_read_unlock() deadlock commentary
rcu: Improve comments describing RCU read-side critical sections
rcu: Create an unrcu_pointer() to remove __rcu from a pointer
srcu: Early test SRCU polling start
rcu: Fix various typos in comments
rcu/nocb: Unify timers
rcu/nocb: Prepare for fine-grained deferred wakeup
rcu/nocb: Only cancel nocb timer if not polling
rcu/nocb: Delete bypass_timer upon nocb_gp wakeup
rcu/nocb: Cancel nocb_timer upon nocb_gp wakeup
rcu/nocb: Allow de-offloading rdp leader
rcu/nocb: Directly call __wake_nocb_gp() from bypass timer
rcu: Don't penalize priority boosting when there is nothing to boost
rcu: Point to documentation of ordering guarantees
rcu: Make rcu_gp_cleanup() be noinline for tracing
rcu: Restrict RCU_STRICT_GRACE_PERIOD to at most four CPUs
rcu: Make show_rcu_gp_kthreads() dump rcu_node structures blocking GP
...
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Pull lkmm fixlet from Paul E McKenney.
Fix missing underscore in Linux-kernel memory model docs.
* 'lkmm.2021.05.10c' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
tools/memory-model: Fix smp_mb__after_spinlock() spelling
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Pull tracing updates from Steven Rostedt:
- Added option for per CPU threads to the hwlat tracer
- Have hwlat tracer handle hotplug CPUs
- New tracer: osnoise, that detects latency caused by interrupts,
softirqs and scheduling of other tasks.
- Added timerlat tracer that creates a thread and measures in detail
what sources of latency it has for wake ups.
- Removed the "success" field of the sched_wakeup trace event. This has
been hardcoded as "1" since 2015, no tooling should be looking at it
now. If one exists, we can revert this commit, fix that tool and try
to remove it again in the future.
- tgid mapping fixed to handle more than PID_MAX_DEFAULT pids/tgids.
- New boot command line option "tp_printk_stop", as tp_printk causes
trace events to write to console. When user space starts, this can
easily live lock the system. Having a boot option to stop just after
boot up is useful to prevent that from happening.
- Have ftrace_dump_on_oops boot command line option take numbers that
match the numbers shown in /proc/sys/kernel/ftrace_dump_on_oops.
- Bootconfig clean ups, fixes and enhancements.
- New ktest script that tests bootconfig options.
- Add tracepoint_probe_register_may_exist() to register a tracepoint
without triggering a WARN*() if it already exists. BPF has a path
from user space that can do this. All other paths are considered a
bug.
- Small clean ups and fixes
* tag 'trace-v5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (49 commits)
tracing: Resize tgid_map to pid_max, not PID_MAX_DEFAULT
tracing: Simplify & fix saved_tgids logic
treewide: Add missing semicolons to __assign_str uses
tracing: Change variable type as bool for clean-up
trace/timerlat: Fix indentation on timerlat_main()
trace/osnoise: Make 'noise' variable s64 in run_osnoise()
tracepoint: Add tracepoint_probe_register_may_exist() for BPF tracing
tracing: Fix spelling in osnoise tracer "interferences" -> "interference"
Documentation: Fix a typo on trace/osnoise-tracer
trace/osnoise: Fix return value on osnoise_init_hotplug_support
trace/osnoise: Make interval u64 on osnoise_main
trace/osnoise: Fix 'no previous prototype' warnings
tracing: Have osnoise_main() add a quiescent state for task rcu
seq_buf: Make trace_seq_putmem_hex() support data longer than 8
seq_buf: Fix overflow in seq_buf_putmem_hex()
trace/osnoise: Support hotplug operations
trace/hwlat: Support hotplug operations
trace/hwlat: Protect kdata->kthread with get/put_online_cpus
trace: Add timerlat tracer
trace: Add osnoise tracer
...
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Pull Kselftest update from Shuah Khan:
"Fixes to existing tests and framework:
- migrate sgx test to kselftest harness
- add new test cases to sgx test
- ftrace test fix event-no-pid on 1-core machine
- splice test adjust for handler fallback removal"
* tag 'linux-kselftest-next-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
selftests/sgx: remove checks for file execute permissions
selftests/ftrace: fix event-no-pid on 1-core machine
selftests/sgx: Refine the test enclave to have storage
selftests/sgx: Add EXPECT_EEXIT() macro
selftests/sgx: Dump enclave memory map
selftests/sgx: Migrate to kselftest harness
selftests/sgx: Rename 'eenter' and 'sgx_call_vdso'
selftests: timers: rtcpie: skip test if default RTC device does not exist
selftests: lib.mk: Also install "config" and "settings"
selftests: splice: Adjust for handler fallback removal
selftests/tls: Add {} to avoid static checker warning
selftests/resctrl: Fix incorrect parsing of option "-t"
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Pull KUnit update from Shuah Khan:
"Fixes and features:
- add support for skipped tests
- introduce kunit_kmalloc_array/kunit_kcalloc() helpers
- add gnu_printf specifiers
- add kunit_shutdown
- add unit test for filtering suites by names
- convert lib/test_list_sort.c to use KUnit
- code organization moving default config to tools/testing/kunit
- refactor of internal parser input handling
- cleanups and updates to documentation
- code cleanup related to casts"
* tag 'linux-kselftest-kunit-fixes-5.14-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (29 commits)
kunit: add unit test for filtering suites by names
kasan: test: make use of kunit_skip()
kunit: test: Add example tests which are always skipped
kunit: tool: Support skipped tests in kunit_tool
kunit: Support skipped tests
thunderbolt: test: Reinstate a few casts of bitfields
kunit: tool: internal refactor of parser input handling
lib/test: convert lib/test_list_sort.c to use KUnit
kunit: introduce kunit_kmalloc_array/kunit_kcalloc() helpers
kunit: Remove the unused all_tests.config
kunit: Move default config from arch/um -> tools/testing/kunit
kunit: arch/um/configs: Enable KUNIT_ALL_TESTS by default
kunit: Add gnu_printf specifiers
lib/cmdline_kunit: Remove a cast which are no-longer required
kernel/sysctl-test: Remove some casts which are no-longer required
thunderbolt: test: Remove some casts which are no longer required
mmc: sdhci-of-aspeed: Remove some unnecessary casts from KUnit tests
iio: Remove a cast in iio-test-format which is no longer required
device property: Remove some casts in property-entry-test
Documentation: kunit: Clean up some string casts in examples
...
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Pull powerpc updates from Michael Ellerman:
- A big series refactoring parts of our KVM code, and converting some
to C.
- Support for ARCH_HAS_SET_MEMORY, and ARCH_HAS_STRICT_MODULE_RWX on
some CPUs.
- Support for the Microwatt soft-core.
- Optimisations to our interrupt return path on 64-bit.
- Support for userspace access to the NX GZIP accelerator on PowerVM on
Power10.
- Enable KUAP and KUEP by default on 32-bit Book3S CPUs.
- Other smaller features, fixes & cleanups.
Thanks to: Andy Shevchenko, Aneesh Kumar K.V, Arnd Bergmann, Athira
Rajeev, Baokun Li, Benjamin Herrenschmidt, Bharata B Rao, Christophe
Leroy, Daniel Axtens, Daniel Henrique Barboza, Finn Thain, Geoff Levand,
Haren Myneni, Jason Wang, Jiapeng Chong, Joel Stanley, Jordan Niethe,
Kajol Jain, Nathan Chancellor, Nathan Lynch, Naveen N. Rao, Nicholas
Piggin, Nick Desaulniers, Paul Mackerras, Russell Currey, Sathvika
Vasireddy, Shaokun Zhang, Stephen Rothwell, Sudeep Holla, Suraj Jitindar
Singh, Tom Rix, Vaibhav Jain, YueHaibing, Zhang Jianhua, and Zhen Lei.
* tag 'powerpc-5.14-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (218 commits)
powerpc: Only build restart_table.c for 64s
powerpc/64s: move ret_from_fork etc above __end_soft_masked
powerpc/64s/interrupt: clean up interrupt return labels
powerpc/64/interrupt: add missing kprobe annotations on interrupt exit symbols
powerpc/64: enable MSR[EE] in irq replay pt_regs
powerpc/64s/interrupt: preserve regs->softe for NMI interrupts
powerpc/64s: add a table of implicit soft-masked addresses
powerpc/64e: remove implicit soft-masking and interrupt exit restart logic
powerpc/64e: fix CONFIG_RELOCATABLE build warnings
powerpc/64s: fix hash page fault interrupt handler
powerpc/4xx: Fix setup_kuep() on SMP
powerpc/32s: Fix setup_{kuap/kuep}() on SMP
powerpc/interrupt: Use names in check_return_regs_valid()
powerpc/interrupt: Also use exit_must_hard_disable() on PPC32
powerpc/sysfs: Replace sizeof(arr)/sizeof(arr[0]) with ARRAY_SIZE
powerpc/ptrace: Refactor regs_set_return_{msr/ip}
powerpc/ptrace: Move set_return_regs_changed() before regs_set_return_{msr/ip}
powerpc/stacktrace: Fix spurious "stale" traces in raise_backtrace_ipi()
powerpc/pseries/vas: Include irqdomain.h
powerpc: mark local variables around longjmp as volatile
...
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Pull perf tool updates from Arnaldo Carvalho de Melo:
"Tools:
- Add cgroup support for 'perf top' (-G).
- Add support for KVM MSRs in 'perf kvm stat'
- Support probes on init functions in 'perf probe', to support the
bootconfig format.
- Improve error reporting in 'perf probe'.
- No need to synthesize BUILD_ID records in 'perf inject' if the
MMAP2 records have build ids already.
- Allow toggling source code ('s' hotkey) in 'perf annotate' in all
lines.
- Add itrace options support to 'perf annotate'.
- Support to custom DSO filters for 'perf script'.
Hardware enablement:
- Support the HYBRID_TOPOLOGY and HYBRID_CPU_PMU_CAPS features in the
perf.data file header.
- Support PMU prefix for mem-load and mem-store events, to support
hybrid (BIG little) CPUs such as Intel's Alderlake.
- Support hybrid CPUs in 'perf mem' and 'perf c2c'.
Hardware tracing:
- Intel PT now supports tracing KVM guests.
- Timestamp improvements for ARM's Coresight.
Build:
- Add 'make -C tools/perf build-test' entries for
libopencsd/CORESIGHT=1 and libbpf/LIBBPF_DYNAMIC=1.
- Use bison's --file-prefix-map option to avoid storing full paths
when using O= in the perf build.
Tests:
- Improve the 'perf test' entries for libpfm4 and BPF counters.
Misc:
- Sync msr-index.h, mount.h, kvm headers with the kernel originals.
- Add vendor events and metrics for Intel's Icelake Server & Client"
* tag 'perf-tools-for-v5.14-2021-07-01' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux: (123 commits)
perf session: Add missing evlist__delete when deleting a session
perf annotate: Allow 's' on source code lines
perf dlfilter: Add object_code() to perf_dlfilter_fns
perf dlfilter: Add attr() to perf_dlfilter_fns
perf dlfilter: Add srcline() to perf_dlfilter_fns
perf dlfilter: Add insn() to perf_dlfilter_fns
perf dlfilter: Add resolve_address() to perf_dlfilter_fns
perf build: Install perf_dlfilter.h
perf script: Add option to pass arguments to dlfilters
perf script: Add option to list dlfilters
perf script: Add dlfilter__filter_event_early()
perf script: Add API for filtering via dynamically loaded shared object
perf llvm: Return -ENOMEM when asprintf() fails
perf cs-etm: Delay decode of non-timeless data until cs_etm__flush_events()
tools headers UAPI: Synch KVM's svm.h header with the kernel
tools kvm headers arm64: Update KVM headers from the kernel sources
tools headers UAPI: Sync linux/kvm.h with the kernel sources
tools headers cpufeatures: Sync with the kernel sources
tools include UAPI: Update linux/mount.h copy
tools arch x86: Sync the msr-index.h copy with the kernel sources
...
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Merge more updates from Andrew Morton:
"190 patches.
Subsystems affected by this patch series: mm (hugetlb, userfaultfd,
vmscan, kconfig, proc, z3fold, zbud, ras, mempolicy, memblock,
migration, thp, nommu, kconfig, madvise, memory-hotplug, zswap,
zsmalloc, zram, cleanups, kfence, and hmm), procfs, sysctl, misc,
core-kernel, lib, lz4, checkpatch, init, kprobes, nilfs2, hfs,
signals, exec, kcov, selftests, compress/decompress, and ipc"
* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (190 commits)
ipc/util.c: use binary search for max_idx
ipc/sem.c: use READ_ONCE()/WRITE_ONCE() for use_global_lock
ipc: use kmalloc for msg_queue and shmid_kernel
ipc sem: use kvmalloc for sem_undo allocation
lib/decompressors: remove set but not used variabled 'level'
selftests/vm/pkeys: exercise x86 XSAVE init state
selftests/vm/pkeys: refill shadow register after implicit kernel write
selftests/vm/pkeys: handle negative sys_pkey_alloc() return code
selftests/vm/pkeys: fix alloc_random_pkey() to make it really, really random
kcov: add __no_sanitize_coverage to fix noinstr for all architectures
exec: remove checks in __register_bimfmt()
x86: signal: don't do sas_ss_reset() until we are certain that sigframe won't be abandoned
hfsplus: report create_date to kstat.btime
hfsplus: remove unnecessary oom message
nilfs2: remove redundant continue statement in a while-loop
kprobes: remove duplicated strong free_insn_page in x86 and s390
init: print out unknown kernel parameters
checkpatch: do not complain about positive return values starting with EPOLL
checkpatch: improve the indented label test
checkpatch: scripts/spdxcheck.py now requires python3
...
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|
Pull cgroup updates from Tejun Heo:
- cgroup.kill is added which implements atomic killing of the whole
subtree.
Down the line, this should be able to replace the multiple userland
implementations of "keep killing till empty".
- PSI can now be turned off at boot time to avoid overhead for
configurations which don't care about PSI.
* 'for-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup:
cgroup: make per-cgroup pressure stall tracking configurable
cgroup: Fix kernel-doc
cgroup: inline cgroup_task_freeze()
tests/cgroup: test cgroup.kill
tests/cgroup: move cg_wait_for(), cg_prepare_for_wait()
tests/cgroup: use cgroup.kill in cg_killall()
docs/cgroup: add entry for cgroup.kill
cgroup: introduce cgroup.kill
|
|
ASan reports a memory leak caused by evlist not being deleted on exit in
perf-report, perf-script and perf-data.
The problem is caused by evlist->session not being deleted, which is
allocated in perf_session__read_header, called in perf_session__new if
perf_data is in read mode.
In case of write mode, the session->evlist is filled by the caller.
This patch solves the problem by calling evlist__delete in
perf_session__delete if perf_data is in read mode.
Changes in v2:
- call evlist__delete from within perf_session__delete
v1: https://lore.kernel.org/lkml/20210621234317.235545-1-rickyman7@gmail.com/
ASan report follows:
$ ./perf script report flamegraph
=================================================================
==227640==ERROR: LeakSanitizer: detected memory leaks
<SNIP unrelated>
Indirect leak of 2704 byte(s) in 1 object(s) allocated from:
#0 0x4f4137 in calloc (/home/user/linux/tools/perf/perf+0x4f4137)
#1 0xbe3d56 in zalloc /home/user/linux/tools/lib/perf/../../lib/zalloc.c:8:9
#2 0x7f999e in evlist__new /home/user/linux/tools/perf/util/evlist.c:77:26
#3 0x8ad938 in perf_session__read_header /home/user/linux/tools/perf/util/header.c:3797:20
#4 0x8ec714 in perf_session__open /home/user/linux/tools/perf/util/session.c:109:6
#5 0x8ebe83 in perf_session__new /home/user/linux/tools/perf/util/session.c:213:10
#6 0x60c6de in cmd_script /home/user/linux/tools/perf/builtin-script.c:3856:12
#7 0x7b2930 in run_builtin /home/user/linux/tools/perf/perf.c:313:11
#8 0x7b120f in handle_internal_command /home/user/linux/tools/perf/perf.c:365:8
#9 0x7b2493 in run_argv /home/user/linux/tools/perf/perf.c:409:2
#10 0x7b0c89 in main /home/user/linux/tools/perf/perf.c:539:3
#11 0x7f5260654b74 (/lib64/libc.so.6+0x27b74)
Indirect leak of 568 byte(s) in 1 object(s) allocated from:
#0 0x4f4137 in calloc (/home/user/linux/tools/perf/perf+0x4f4137)
#1 0xbe3d56 in zalloc /home/user/linux/tools/lib/perf/../../lib/zalloc.c:8:9
#2 0x80ce88 in evsel__new_idx /home/user/linux/tools/perf/util/evsel.c:268:24
#3 0x8aed93 in evsel__new /home/user/linux/tools/perf/util/evsel.h:210:9
#4 0x8ae07e in perf_session__read_header /home/user/linux/tools/perf/util/header.c:3853:11
#5 0x8ec714 in perf_session__open /home/user/linux/tools/perf/util/session.c:109:6
#6 0x8ebe83 in perf_session__new /home/user/linux/tools/perf/util/session.c:213:10
#7 0x60c6de in cmd_script /home/user/linux/tools/perf/builtin-script.c:3856:12
#8 0x7b2930 in run_builtin /home/user/linux/tools/perf/perf.c:313:11
#9 0x7b120f in handle_internal_command /home/user/linux/tools/perf/perf.c:365:8
#10 0x7b2493 in run_argv /home/user/linux/tools/perf/perf.c:409:2
#11 0x7b0c89 in main /home/user/linux/tools/perf/perf.c:539:3
#12 0x7f5260654b74 (/lib64/libc.so.6+0x27b74)
Indirect leak of 264 byte(s) in 1 object(s) allocated from:
#0 0x4f4137 in calloc (/home/user/linux/tools/perf/perf+0x4f4137)
#1 0xbe3d56 in zalloc /home/user/linux/tools/lib/perf/../../lib/zalloc.c:8:9
#2 0xbe3e70 in xyarray__new /home/user/linux/tools/lib/perf/xyarray.c:10:23
#3 0xbd7754 in perf_evsel__alloc_id /home/user/linux/tools/lib/perf/evsel.c:361:21
#4 0x8ae201 in perf_session__read_header /home/user/linux/tools/perf/util/header.c:3871:7
#5 0x8ec714 in perf_session__open /home/user/linux/tools/perf/util/session.c:109:6
#6 0x8ebe83 in perf_session__new /home/user/linux/tools/perf/util/session.c:213:10
#7 0x60c6de in cmd_script /home/user/linux/tools/perf/builtin-script.c:3856:12
#8 0x7b2930 in run_builtin /home/user/linux/tools/perf/perf.c:313:11
#9 0x7b120f in handle_internal_command /home/user/linux/tools/perf/perf.c:365:8
#10 0x7b2493 in run_argv /home/user/linux/tools/perf/perf.c:409:2
#11 0x7b0c89 in main /home/user/linux/tools/perf/perf.c:539:3
#12 0x7f5260654b74 (/lib64/libc.so.6+0x27b74)
Indirect leak of 32 byte(s) in 1 object(s) allocated from:
#0 0x4f4137 in calloc (/home/user/linux/tools/perf/perf+0x4f4137)
#1 0xbe3d56 in zalloc /home/user/linux/tools/lib/perf/../../lib/zalloc.c:8:9
#2 0xbd77e0 in perf_evsel__alloc_id /home/user/linux/tools/lib/perf/evsel.c:365:14
#3 0x8ae201 in perf_session__read_header /home/user/linux/tools/perf/util/header.c:3871:7
#4 0x8ec714 in perf_session__open /home/user/linux/tools/perf/util/session.c:109:6
#5 0x8ebe83 in perf_session__new /home/user/linux/tools/perf/util/session.c:213:10
#6 0x60c6de in cmd_script /home/user/linux/tools/perf/builtin-script.c:3856:12
#7 0x7b2930 in run_builtin /home/user/linux/tools/perf/perf.c:313:11
#8 0x7b120f in handle_internal_command /home/user/linux/tools/perf/perf.c:365:8
#9 0x7b2493 in run_argv /home/user/linux/tools/perf/perf.c:409:2
#10 0x7b0c89 in main /home/user/linux/tools/perf/perf.c:539:3
#11 0x7f5260654b74 (/lib64/libc.so.6+0x27b74)
Indirect leak of 7 byte(s) in 1 object(s) allocated from:
#0 0x4b8207 in strdup (/home/user/linux/tools/perf/perf+0x4b8207)
#1 0x8b4459 in evlist__set_event_name /home/user/linux/tools/perf/util/header.c:2292:16
#2 0x89d862 in process_event_desc /home/user/linux/tools/perf/util/header.c:2313:3
#3 0x8af319 in perf_file_section__process /home/user/linux/tools/perf/util/header.c:3651:9
#4 0x8aa6e9 in perf_header__process_sections /home/user/linux/tools/perf/util/header.c:3427:9
#5 0x8ae3e7 in perf_session__read_header /home/user/linux/tools/perf/util/header.c:3886:2
#6 0x8ec714 in perf_session__open /home/user/linux/tools/perf/util/session.c:109:6
#7 0x8ebe83 in perf_session__new /home/user/linux/tools/perf/util/session.c:213:10
#8 0x60c6de in cmd_script /home/user/linux/tools/perf/builtin-script.c:3856:12
#9 0x7b2930 in run_builtin /home/user/linux/tools/perf/perf.c:313:11
#10 0x7b120f in handle_internal_command /home/user/linux/tools/perf/perf.c:365:8
#11 0x7b2493 in run_argv /home/user/linux/tools/perf/perf.c:409:2
#12 0x7b0c89 in main /home/user/linux/tools/perf/perf.c:539:3
#13 0x7f5260654b74 (/lib64/libc.so.6+0x27b74)
SUMMARY: AddressSanitizer: 3728 byte(s) leaked in 7 allocation(s).
Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
Acked-by: Ian Rogers <irogers@google.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210624231926.212208-1-rickyman7@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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In perf annotate, when 's' is pressed on a line containing source code,
it shows the message "Only available for assembly lines".
This patch gets rid of the error, moving the cursr to the next available
asm line (or the closest previous one if no asm line is found moving
forwards), before hiding source code lines.
Changes in v2:
- handle case of no asm line found in
annotate_browser__find_next_asm_line by returning NULL and
handling error in caller.
Signed-off-by: Riccardo Mancini <rickyman7@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Martin Liška <mliska@suse.cz>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210624223423.189550-1-rickyman7@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Add a function, for use by dlfilters, to read object code.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-11-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Add a function, for use by dlfilters, to return the perf_event_attr
structure.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-10-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Add a function, for use by dlfilters, to return source code file name and
line number.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Add a function, for use by dlfilters, to return instruction bytes.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-8-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Add a function, for use by dlfilters, to resolve addresses from branch
stacks or callchains.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-7-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Users of the --dlfilter option need to include perf_dlfilter.h
in their filters. Install it to the include path.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Add option --dlarg to pass arguments to dlfilters. The --dlarg option can
be repeated to pass more than 1 argument.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Add option --list-dlfilters to list dlfilters in the current directory or
the exec-path e.g. ~/libexec/perf-core/dlfilters. Use with option -v (must
come before option --list-dlfilters) to show long descriptions.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
filter_event_early() can be more than 30% faster than filter_event()
because it is called before internal filtering. In other respects it
is the same as filter_event(), except that it will be passed events
that have yet to be filtered out.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
In some cases, users want to filter very large amounts of data (e.g.
from AUX area tracing like Intel PT) looking for something specific.
While scripting such as Python can be used, Python is 10 to 20 times
slower than C. So define a C API so that custom filters can be written
and loaded.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210627131818.810-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Zhihao sent a patch but it made llvm__compile_bpf() return what
asprintf() returns on error, which is just -1, but since this function
returns -errno, fix it by returning -ENOMEM for this case instead.
Fixes: cb76371441d098 ("perf llvm: Allow passing options to llc ...")
Fixes: 5eab5a7ee032ac ("perf llvm: Display eBPF compiling command ...")
Reported-by: Hulk Robot <hulkci@huawei.com>
Reported-by: Zhihao Cheng <chengzhihao1@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Yu Kuai <yukuai3@huawei.com>
Cc: clang-built-linux@googlegroups.com
Link: http://lore.kernel.org/lkml/20210609115945.2193194-1-chengzhihao1@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Currently, timeless mode starts the decode on PERF_RECORD_EXIT, and
non-timeless mode starts decoding on the fist PERF_RECORD_AUX record.
This can cause the "data has no samples!" error if the first
PERF_RECORD_AUX record comes before the first (or any relevant)
PERF_RECORD_MMAP2 record because the mmaps are required by the decoder
to access the binary data.
This change pushes the start of non-timeless decoding to the very end of
parsing the file. The PERF_RECORD_EXIT event can't be used because it
might not exist in system-wide or snapshot modes.
I have not been able to find the exact cause for the events to be
intermittently in the wrong order in the basic scenario:
perf record -e cs_etm/@tmc_etr0/u top
But it can be made to happen every time with the --delay option. This is
because "enable_on_exec" is disabled, which causes tracing to start
before the process to be launched is exec'd. For example:
perf record -e cs_etm/@tmc_etr0/u --delay=1 top
perf report -D | grep 'AUX\|MAP'
0 16714475632740 0x520 [0x40]: PERF_RECORD_AUX offset: 0 size: 0x30 flags: 0 []
0 16714476494960 0x5d0 [0x40]: PERF_RECORD_AUX offset: 0x30 size: 0x30 flags: 0 []
0 16714478208900 0x660 [0x40]: PERF_RECORD_AUX offset: 0x60 size: 0x30 flags: 0 []
4294967295 16714478293340 0x700 [0x70]: PERF_RECORD_MMAP2 8712/8712: [0x557a460000(0x54000) @ 0 00:17 5329258 0]: r-xp /usr/bin/top
4294967295 16714478353020 0x770 [0x88]: PERF_RECORD_MMAP2 8712/8712: [0x7f86f72000(0x34000) @ 0 00:17 5214354 0]: r-xp /usr/lib/aarch64-linux-gnu/ld-2.31.so
Another scenario in which decoding from the first aux record fails is a
workload that forks. Although the aux record comes after 'bash', it
comes before 'top', which is what we are interested in. For example:
perf record -e cs_etm/@tmc_etr0/u -- bash -c top
perf report -D | grep 'AUX\|MAP'
4294967295 16853946421300 0x510 [0x70]: PERF_RECORD_MMAP2 8723/8723: [0x558f280000(0x142000) @ 0 00:17 5213953 0]: r-xp /usr/bin/bash
4294967295 16853946543560 0x580 [0x88]: PERF_RECORD_MMAP2 8723/8723: [0x7fbba6e000(0x34000) @ 0 00:17 5214354 0]: r-xp /usr/lib/aarch64-linux-gnu/ld-2.31.so
4294967295 16853946628420 0x608 [0x68]: PERF_RECORD_MMAP2 8723/8723: [0x7fbba9e000(0x1000) @ 0 00:00 0 0]: r-xp [vdso]
0 16853947067300 0x690 [0x40]: PERF_RECORD_AUX offset: 0 size: 0x3a60 flags: 0 []
...
0 16853966602580 0x1758 [0x40]: PERF_RECORD_AUX offset: 0xc2470 size: 0x30 flags: 0 []
4294967295 16853967119860 0x1818 [0x70]: PERF_RECORD_MMAP2 8723/8723: [0x5559e70000(0x54000) @ 0 00:17 5329258 0]: r-xp /usr/bin/top
4294967295 16853967181620 0x1888 [0x88]: PERF_RECORD_MMAP2 8723/8723: [0x7f9ed06000(0x34000) @ 0 00:17 5214354 0]: r-xp /usr/lib/aarch64-linux-gnu/ld-2.31.so
4294967295 16853967237180 0x1910 [0x68]: PERF_RECORD_MMAP2 8723/8723: [0x7f9ed36000(0x1000) @ 0 00:00 0 0]: r-xp [vdso]
A third scenario is when the majority of time is spent in a shared
library that is not loaded at startup. For example a dynamically loaded
plugin.
Testing
=======
Testing was done by checking if any samples that are present in the
old output are missing from the new output. Timestamps must be
stripped out with awk because now they are set to the last AUX sample,
rather than the first:
./perf script $4 | awk '!($4="")' > new.script
./perf-default script $4 | awk '!($4="")' > default.script
comm -13 <(sort -u new.script) <(sort -u default.script)
Testing showed that the new output is a superset of the old. When lines
appear in the comm output, it is not because they are missing but
because [unknown] is now resolved to sensible locations. For example
last putp branch here now resolves to libtinfo, so it's not missing
from the output, but is actually improved:
Old:
top 305 [001] 1 branches:uH: 402830 _init+0x30 (/usr/bin/top.procps) => 404a1c [unknown] (/usr/bin/top.procps)
top 305 [001] 1 branches:uH: 404a20 [unknown] (/usr/bin/top.procps) => 402970 putp@plt+0x0 (/usr/bin/top.procps)
top 305 [001] 1 branches:uH: 40297c putp@plt+0xc (/usr/bin/top.procps) => 0 [unknown] ([unknown])
New:
top 305 [001] 1 branches:uH: 402830 _init+0x30 (/usr/bin/top.procps) => 404a1c [unknown] (/usr/bin/top.procps)
top 305 [001] 1 branches:uH: 404a20 [unknown] (/usr/bin/top.procps) => 402970 putp@plt+0x0 (/usr/bin/top.procps)
top 305 [001] 1 branches:uH: 40297c putp@plt+0xc (/usr/bin/top.procps) => 7f8ab39208 putp+0x0 (/lib/libtinfo.so.5.9)
In the following two modes, decoding now works and the "data has no
samples!" error is not displayed any more:
perf record -e cs_etm/@tmc_etr0/u -- bash -c top
perf record -e cs_etm/@tmc_etr0/u --delay=1 top
In snapshot mode, there is also an improvement to decoding. Previously
samples for the 'kill' process that was used to send SIGUSR2 were
completely missing, because the process hadn't started yet. But now
there are additional samples present:
perf record -e cs_etm/@tmc_etr0/u --snapshot -a
perf script
stress 19380 [003] 161627.938153: 1000000 instructions:uH: aaaabb612fb4 [unknown] (/usr/bin/stress)
kill 19644 [000] 161627.938153: 1000000 instructions:uH: ffffae0ef210 [unknown] (/lib/aarch64-linux-gnu/ld-2.27.so)
stress 19380 [003] 161627.938153: 1000000 instructions:uH: ffff9e754d40 random_r+0x20 (/lib/aarch64-linux-gnu/libc-2.27.so)
Also tested was the round trip of 'perf inject' followed by 'perf
report' which has the same differences and improvements.
Signed-off-by: James Clark <james.clark@arm.com>
Reviewed-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Leo Yan <leo.yan@linaro.org>
Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Al Grant <al.grant@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Branislav Rankov <branislav.rankov@arm.com>
Cc: Denis Nikitin <denik@chromium.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lore.kernel.org/lkml/20210609130421.13934-1-james.clark@arm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
To pick up the changes from:
59d21d67f37481cf ("KVM: SVM: Software reserved fields")
Picking the new SVM_EXIT_SW exit reasons.
Addressing this perf build warning:
Warning: Kernel ABI header at 'tools/arch/x86/include/uapi/asm/svm.h' differs from latest version at 'arch/x86/include/uapi/asm/svm.h'
diff -u tools/arch/x86/include/uapi/asm/svm.h arch/x86/include/uapi/asm/svm.h
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Vineeth Pillai <viremana@linux.microsoft.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
To pick the changes from:
f0376edb1ddcab19 ("KVM: arm64: Add ioctl to fetch/store tags in a guest")
That don't causes any changes in tooling (when built on x86), only
addresses this perf build warning:
Warning: Kernel ABI header at 'tools/arch/arm64/include/uapi/asm/kvm.h' differs from latest version at 'arch/arm64/include/uapi/asm/kvm.h'
diff -u tools/arch/arm64/include/uapi/asm/kvm.h arch/arm64/include/uapi/asm/kvm.h
Cc: Marc Zyngier <maz@kernel.org>
Cc: Steven Price <steven.price@arm.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
To pick the changes in:
19238e75bd8ed8ff ("kvm: x86: Allow userspace to handle emulation errors")
cb082bfab59a224a ("KVM: stats: Add fd-based API to read binary stats data")
b87cc116c7e1bc62 ("KVM: PPC: Book3S HV: Add KVM_CAP_PPC_RPT_INVALIDATE capability")
f0376edb1ddcab19 ("KVM: arm64: Add ioctl to fetch/store tags in a guest")
0dbb11230437895f ("KVM: X86: Introduce KVM_HC_MAP_GPA_RANGE hypercall")
6dba940352038b56 ("KVM: x86: Introduce KVM_GET_SREGS2 / KVM_SET_SREGS2")
644f706719f0297b ("KVM: x86: hyper-v: Introduce KVM_CAP_HYPERV_ENFORCE_CPUID")
That automatically adds support for these new ioctls:
$ tools/perf/trace/beauty/kvm_ioctl.sh > before
$ cp include/uapi/linux/kvm.h tools/include/uapi/linux/kvm.h
$ tools/perf/trace/beauty/kvm_ioctl.sh > after
$ diff -u before after
--- before 2021-07-01 13:42:07.006387354 -0300
+++ after 2021-07-01 13:45:16.051649301 -0300
@@ -95,6 +95,9 @@
[0xc9] = "XEN_HVM_SET_ATTR",
[0xca] = "XEN_VCPU_GET_ATTR",
[0xcb] = "XEN_VCPU_SET_ATTR",
+ [0xcc] = "GET_SREGS2",
+ [0xcd] = "SET_SREGS2",
+ [0xce] = "GET_STATS_FD",
[0xe0] = "CREATE_DEVICE",
[0xe1] = "SET_DEVICE_ATTR",
[0xe2] = "GET_DEVICE_ATTR",
$
This silences these perf build warning:
Warning: Kernel ABI header at 'tools/arch/x86/include/uapi/asm/kvm.h' differs from latest version at 'arch/x86/include/uapi/asm/kvm.h'
diff -u tools/arch/x86/include/uapi/asm/kvm.h arch/x86/include/uapi/asm/kvm.h
Warning: Kernel ABI header at 'tools/include/uapi/linux/kvm.h' differs from latest version at 'include/uapi/linux/kvm.h'
diff -u tools/include/uapi/linux/kvm.h include/uapi/linux/kvm.h
Cc: Aaron Lewis <aaronlewis@google.com>
Cc: Ashish Kalra <ashish.kalra@amd.com>
Cc: Bharata B Rao <bharata@linux.ibm.com>
Cc: Jing Zhang <jingzhangos@google.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Maxim Levitsky <mlevitsk@redhat.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Steven Price <steven.price@arm.com>
Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
To pick the changes from:
1348924ba8169f35 ("x86/msr: Define new bits in TSX_FORCE_ABORT MSR")
cbcddaa33d7e11a0 ("perf/x86/rapl: Use CPUID bit on AMD and Hygon parts")
This only causes these perf files to be rebuilt:
CC /tmp/build/perf/bench/mem-memcpy-x86-64-asm.o
CC /tmp/build/perf/bench/mem-memset-x86-64-asm.o
And addresses this perf build warning:
Warning: Kernel ABI header at 'tools/arch/x86/include/asm/cpufeatures.h' differs from latest version at 'arch/x86/include/asm/cpufeatures.h'
diff -u tools/arch/x86/include/asm/cpufeatures.h arch/x86/include/asm/cpufeatures.h
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
To pick the changes from:
dd8b477f9a3d8edb ("mount: Support "nosymfollow" in new mount api")
That ends up adding support for the new MOUNT_ATTR_NOSYMFOLLOW mount
attribute:
$ tools/perf/trace/beauty/fsmount.sh > before
$ cp include/uapi/linux/mount.h tools/include/uapi/linux/mount.h
$ tools/perf/trace/beauty/fsmount.sh > after
$ diff -u before after
--- before 2021-07-01 13:34:04.542517355 -0300
+++ after 2021-07-01 13:34:12.423694537 -0300
@@ -7,4 +7,5 @@
[ilog2(0x00000020) + 1] = "STRICTATIME",
[ilog2(0x00000080) + 1] = "NODIRATIME",
[ilog2(0x00100000) + 1] = "IDMAP",
+ [ilog2(0x00200000) + 1] = "NOSYMFOLLOW",
};
$
So now one can use it in --filter expressions for tracepoints.
This silences this perf build warnings:
Warning: Kernel ABI header at 'tools/include/uapi/linux/mount.h' differs from latest version at 'include/uapi/linux/mount.h'
diff -u tools/include/uapi/linux/mount.h include/uapi/linux/mount.h
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
To pick up the changes from these csets:
1348924ba8169f35 ("x86/msr: Define new bits in TSX_FORCE_ABORT MSR")
That cause no changes to tooling:
$ tools/perf/trace/beauty/tracepoints/x86_msr.sh > before
$ cp arch/x86/include/asm/msr-index.h tools/arch/x86/include/asm/msr-index.h
$ tools/perf/trace/beauty/tracepoints/x86_msr.sh > after
$ diff -u before after
$
Just silences this perf build warning:
Warning: Kernel ABI header at 'tools/arch/x86/include/asm/msr-index.h' differs from latest version at 'arch/x86/include/asm/msr-index.h'
diff -u tools/arch/x86/include/asm/msr-index.h arch/x86/include/asm/msr-index.h
Cc: Borislav Petkov <bp@suse.de>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
When decode Arm SPE trace, it waits for PERF_RECORD_EXIT event (the last
perf event) for processing trace data, which is needless and even might
cause logic error, e.g. it might fail to correlate perf events with Arm
SPE events correctly.
So this patch removes the condition checking for PERF_RECORD_EXIT event.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Al Grant <Al.Grant@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210519071939.1598923-6-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
It's possible that record in Arm SPE trace is later than perf event and
vice versa. This asks to correlate the perf events and Arm SPE
synthesized events to be processed in the manner of correct timing.
To achieve the time ordering, this patch reverses the flow, it firstly
calls arm_spe_sample() and then calls arm_spe_decode(). By comparing
the timestamp value and detect the perf event is coming earlier than Arm
SPE trace data, it bails out from the decoding loop, the last record is
pushed into auxtrace stack and is deferred to generate sample. To track
the timestamp, everytime it updates timestamp for the latest record.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Al Grant <Al.Grant@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20210519071939.1598923-5-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
In current code, it assigns the arch timer counter to the synthesized
samples Arm SPE trace, thus the samples don't contain the kernel time
but only contain the raw counter value.
To fix the issue, this patch converts the timer counter to kernel time
and assigns it to sample timestamp.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Al Grant <Al.Grant@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20210519071939.1598923-4-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
When handle a perf event, Arm SPE decoder needs to decide if this perf
event is earlier or later than the samples from Arm SPE trace data; to
do comparision, it needs to use the same unit for the time.
This patch converts the event kernel time to arch timer's counter value,
thus it can be used to compare with counter value contained in Arm SPE
Timestamp packet.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Al Grant <Al.Grant@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20210519071939.1598923-3-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
During the recording phase, "perf record" tool synthesizes event
PERF_RECORD_TIME_CONV for the hardware clock parameters and saves the
event into the data file.
Afterwards, when processing the data file, the event TIME_CONV will be
processed at the very early time and is stored into session context.
This patch extracts these parameters from the session context and saves
into the structure "spe->tc" with the type perf_tsc_conversion, so that
the parameters are ready for conversion between clock counter and time
stamp.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Al Grant <Al.Grant@arm.com>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20210519071939.1598923-2-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
The callback cs_etm_find_snapshot() is invoked for snapshot mode, its
main purpose is to find the correct AUX trace data and returns "head"
and "old" (we can call "old" as "old head") to the caller, the caller
__auxtrace_mmap__read() uses these two pointers to decide the AUX trace
data size.
This patch removes cs_etm_find_snapshot() with below reasons:
- The first thing in cs_etm_find_snapshot() is to check if the head has
wrapped around, if it is not, directly bails out. The checking is
pointless, this is because the "head" and "old" pointers both are
monotonical increasing so they never wrap around.
- cs_etm_find_snapshot() adjusts the "head" and "old" pointers and
assumes the AUX ring buffer is fully filled with the hardware trace
data, so it always subtracts the difference "mm->len" from "head" to
get "old". Let's imagine the snapshot is taken in very short
interval, the tracers only fill a small chunk of the trace data into
the AUX ring buffer, in this case, it's wrongly to copy the whole the
AUX ring buffer to perf file.
- As the "head" and "old" pointers are monotonically increased, the
function __auxtrace_mmap__read() handles these two pointers properly.
It calculates the reminders for these two pointers, and the size is
clamped to be never more than "snapshot_size". We can simply reply on
the function __auxtrace_mmap__read() to calculate the correct result
for data copying, it's not necessary to add Arm CoreSight specific
callback.
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Reviewed-by: James Clark <james.clark@arm.com>
Tested-by: James Clark <james.clark@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Daniel Kiss <daniel.kiss@arm.com>
Cc: Denis Nikitin <denik@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Cc: coresight@lists.linaro.org
Link: http://lore.kernel.org/lkml/20210701093537.90759-3-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
Some helper functions will be used for cgroup counting too. Move them
to a header file for sharing.
Committer notes:
Fix the build on older systems with:
- struct bpf_map_info map_info = {0};
+ struct bpf_map_info map_info = { .id = 0, };
This wasn't breaking the build in such systems as bpf_counter.c isn't
built due to:
tools/perf/util/Build:
perf-$(CONFIG_PERF_BPF_SKEL) += bpf_counter.o
The bpf_counter.h file on the other hand is included from places that
are built everywhere.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210625071826.608504-4-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
|
|
On x86, there is a set of instructions used to save and restore register
state collectively known as the XSAVE architecture. There are about a
dozen different features managed with XSAVE. The protection keys
register, PKRU, is one of those features.
The hardware optimizes XSAVE by tracking when the state has not changed
from its initial (init) state. In this case, it can avoid the cost of
writing state to memory (it would usually just be a bunch of 0's).
When the pkey register is 0x0 the hardware optionally choose to track the
register as being in the init state (optimize away the writes). AMD CPUs
do this more aggressively compared to Intel.
On x86, PKRU is rarely in its (very permissive) init state. Instead, the
value defaults to something very restrictive. It is not surprising that
bugs have popped up in the rare cases when PKRU reaches its init state.
Add a protection key selftest which gets the protection keys register into
its init state in a way that should work on Intel and AMD. Then, do a
bunch of pkey register reads to watch for inadvertent changes.
This adds "-mxsave" to CFLAGS for all the x86 vm selftests in order to
allow use of the XSAVE instruction __builtin functions. This will make
the builtins available on all of the vm selftests, but is expected to be
harmless.
Link: https://lkml.kernel.org/r/20210611164202.1849B712@viggo.jf.intel.com
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
|
|
The pkey test code keeps a "shadow" of the pkey register around. This
ensures that any bugs which might write to the register can be caught more
quickly.
Generally, userspace has a good idea when the kernel is going to write to
the register. For instance, alloc_pkey() is passed a permission mask.
The caller of alloc_pkey() can update the shadow based on the return value
and the mask.
But, the kernel can also modify the pkey register in a more sneaky way.
For mprotect(PROT_EXEC) mappings, the kernel will allocate a pkey and
write the pkey register to create an execute-only mapping. The kernel
never tells userspace what key it uses for this.
This can cause the test to fail with messages like:
protection_keys_64.2: pkey-helpers.h:132: _read_pkey_reg: Assertion `pkey_reg == shadow_pkey_reg' failed.
because the shadow was not updated with the new kernel-set value.
Forcibly update the shadow value immediately after an mprotect().
Link: https://lkml.kernel.org/r/20210611164200.EF76AB73@viggo.jf.intel.com
Fixes: 6af17cf89e99 ("x86/pkeys/selftests: Add PROT_EXEC test")
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The alloc_pkey() sefltest function wraps the sys_pkey_alloc() system call.
On success, it updates its "shadow" register value because
sys_pkey_alloc() updates the real register.
But, the success check is wrong. pkey_alloc() considers any non-zero
return code to indicate success where the pkey register will be modified.
This fails to take negative return codes into account.
Consider only a positive return value as a successful call.
Link: https://lkml.kernel.org/r/20210611164157.87AB4246@viggo.jf.intel.com
Fixes: 5f23f6d082a9 ("x86/pkeys: Add self-tests")
Reported-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Patch series "selftests/vm/pkeys: Bug fixes and a new test".
There has been a lot of activity on the x86 front around the XSAVE
architecture which is used to context-switch processor state (among other
things). In addition, AMD has recently joined the protection keys club by
adding processor support for PKU.
The AMD implementation helped uncover a kernel bug around the PKRU "init
state", which actually applied to Intel's implementation but was just
harder to hit. This series adds a test which is expected to help find
this class of bug both on AMD and Intel. All the work around pkeys on x86
also uncovered a few bugs in the selftest.
This patch (of 4):
The "random" pkey allocation code currently does the good old:
srand((unsigned int)time(NULL));
*But*, it unfortunately does this on every random pkey allocation.
There may be thousands of these a second. time() has a one second
resolution. So, each time alloc_random_pkey() is called, the PRNG is
*RESET* to time(). This is nasty. Normally, if you do:
srand(<ANYTHING>);
foo = rand();
bar = rand();
You'll be quite guaranteed that 'foo' and 'bar' are different. But, if
you do:
srand(1);
foo = rand();
srand(1);
bar = rand();
You are quite guaranteed that 'foo' and 'bar' are the *SAME*. The recent
"fix" effectively forced the test case to use the same "random" pkey for
the whole test, unless the test run crossed a second boundary.
Only run srand() once at program startup.
This explains some very odd and persistent test failures I've been seeing.
Link: https://lkml.kernel.org/r/20210611164153.91B76FB8@viggo.jf.intel.com
Link: https://lkml.kernel.org/r/20210611164155.192D00FF@viggo.jf.intel.com
Fixes: 6e373263ce07 ("selftests/vm/pkeys: fix alloc_random_pkey() to make it really random")
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Cc: Sandipan Das <sandipan@linux.ibm.com>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: "Desnes A. Nunes do Rosario" <desnesn@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Michal Suchanek <msuchanek@suse.de>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Adds some selftests for exclusive device memory.
Link: https://lkml.kernel.org/r/20210616105937.23201-9-apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Acked-by: Jason Gunthorpe <jgg@nvidia.com>
Tested-by: Ralph Campbell <rcampbell@nvidia.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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The cgroup_is_v2() is to check if the given subsystem is mounted on
cgroup v2 or not. It'll be used by BPF cgroup code later.
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20210625071826.608504-3-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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Masami Hiramatsu
Arnaldo Carvalho de Melo
Namhyung Kim
Linus Torvalds
Riccardo Mancini
Adrian Hunter
James Clark
Leo Yan
Dave Hansen
Alistair Popple