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Add a testcase for kprobe event naming. This testcase checks whether the
kprobe events can automatically ganerate its event name on normal
function and dot-suffixed function. Also it checks whether the kprobe
events can correctly define new event with given event name and group
name.
Link: http://lkml.kernel.org/r/61ae96fd1fcd14ee652c8b6525c218b8661bb0d2.1499453040.git.naveen.n.rao@linux.vnet.ibm.com
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
[Updated tests to use vfs_read and symbols with '.isra.',
added check for kprobe_events and a command to clear it on exit,
various additional checks and tests]
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Add a kprobes test to ensure that we are able to add a probe on a
module function using 'p <mod>:<func>' format, with/without having to
specify a probe name.
Link: http://lkml.kernel.org/r/2d8087e25a7ad9206f3e2b7b4bb0c3c86eaa38af.1499453040.git.naveen.n.rao@linux.vnet.ibm.com
Suggested-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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KPROBES_ON_FTRACE is only available on powerpc64le. Update comment to
clarify this.
Also, we should use an offset of 8 to ensure that the probe does not
fall on ftrace location. The current offset of 4 will fall before the
function local entry point and won't fire, while an offset of 12 or 16
will fall on ftrace location. Offset 8 is currently guaranteed to not be
the ftrace location.
Link: http://lkml.kernel.org/r/3d32e8fa076070e83527476fdfa3a747bb9a1a3a.1499453040.git.naveen.n.rao@linux.vnet.ibm.com
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Add a testcase to test kprobes via ftrace interface
with many concurrent kprobe events.
This tries to add many kprobe events (up to 256) on
kernel functions. To avoid making ftrace-based
kprobes (kprobes on fentry), it skips first N bytes
(on x86 N=5, on ppc or arm N=4) of function entry.
After that, it enables all those events, disable it,
and remove it.
Since the unoptimization buffer reclaiming will
be delayed, after removing events, it will wait
enough time.
Link: http://lkml.kernel.org/r/149577388470.11702.11832460851769204511.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Pull kselftest updates from Shuah Khan:
"This update consists of:
- important fixes for build failures and clean target related
warnings to address regressions introduced in commit 88baa78d1f31
("selftests: remove duplicated all and clean target")
- several minor spelling fixes in and log messages and comment
blocks.
- Enabling configs for better test coverage in ftrace, vm, and
cpufreq tests.
- .gitignore changes"
* tag 'linux-kselftest-4.12-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: (26 commits)
selftests: x86: add missing executables to .gitignore
selftests: watchdog: accept multiple params on command line
selftests: create cpufreq kconfig fragments
selftests: x86: override clean in lib.mk to fix warnings
selftests: sync: override clean in lib.mk to fix warnings
selftests: splice: override clean in lib.mk to fix warnings
selftests: gpio: fix clean target to remove all generated files and dirs
selftests: add gpio generated files to .gitignore
selftests: powerpc: override clean in lib.mk to fix warnings
selftests: gpio: override clean in lib.mk to fix warnings
selftests: futex: override clean in lib.mk to fix warnings
selftests: lib.mk: define CLEAN macro to allow Makefiles to override clean
selftests: splice: fix clean target to not remove default_file_splice_read.sh
selftests: gpio: add config fragment for gpio-mockup
selftests: breakpoints: allow to cross-compile for aarch64/arm64
selftests/Makefile: Add missed PHONY targets
selftests/vm/run_vmtests: Fix wrong comment
selftests/Makefile: Add missed closing `"` in comment
selftests/vm/run_vmtests: Polish output text
selftests/timers: fix spelling mistake: "Asynchronous"
...
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Fix to compare a zero-filled hexadecimal value with a part of
string of long hexadecimal value.
In check_types(), the last part of testcase compares with
the hex value formatted by "%x" with a part of a string of
long hex value (trimmed by tail -c and head -c). However,
if that part of long hex value contains zero (e.g. "05" of
"a3082059"), printf generated value (e.g. "5") is diffrent
string, and the test case failed.
To fix this, pass "%02x" instead of "%x" to printf.
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
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When a kretprobe is installed on a kernel function, there is a maximum
limit of how many calls in parallel it can catch (aka "maxactive"). A
kernel module could call register_kretprobe() and initialize maxactive
(see example in samples/kprobes/kretprobe_example.c).
But that is not exposed to userspace and it is currently not possible to
choose maxactive when writing to /sys/kernel/debug/tracing/kprobe_events
The default maxactive can be as low as 1 on single-core with a
non-preemptive kernel. This is too low and we need to increase it not
only for recursive functions, but for functions that sleep or resched.
This patch updates the format of the command that can be written to
kprobe_events so that maxactive can be optionally specified.
I need this for a bpf program attached to the kretprobe of
inet_csk_accept, which can sleep for a long time.
This patch includes a basic selftest:
> # ./ftracetest -v test.d/kprobe/
> === Ftrace unit tests ===
> [1] Kprobe dynamic event - adding and removing [PASS]
> [2] Kprobe dynamic event - busy event check [PASS]
> [3] Kprobe dynamic event with arguments [PASS]
> [4] Kprobes event arguments with types [PASS]
> [5] Kprobe dynamic event with function tracer [PASS]
> [6] Kretprobe dynamic event with arguments [PASS]
> [7] Kretprobe dynamic event with maxactive [PASS]
>
> # of passed: 7
> # of failed: 0
> # of unresolved: 0
> # of untested: 0
> # of unsupported: 0
> # of xfailed: 0
> # of undefined(test bug): 0
BugLink: https://github.com/iovisor/bcc/issues/1072
Link: http://lkml.kernel.org/r/1491215782-15490-1-git-send-email-alban@kinvolk.io
Acked-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Alban Crequy <alban@kinvolk.io>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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Add a testcase for types of kprobe event. This checks
kprobe event can accept and correctly expressed the
arguments typed as s32, u32, x32 and bitfield.
Here is the test result.
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# ./ftracetest test.d/kprobe/kprobe_args_type.tc
=== Ftrace unit tests ===
[1] Kprobes event arguments with types [PASS]
# of passed: 1
# of failed: 0
# of unresolved: 0
# of untested: 0
# of unsupported: 0
# of xfailed: 0
# of undefined(test bug): 0
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Link: http://lkml.kernel.org/r/147928409063.22982.3499119203875115458.stgit@devbox
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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do_fork() is no longer defined on x86, so probe _do_fork() instead.
Fixes: 3033f14ab78c ("clone: support passing tls argument via C ...")
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
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The kprobe testcases create, use and delete dynamic events during the
test but didn't clear the trace buffer so it'll leave the result after
it finishes.
# ./ftracetest
...
# cat trace
# tracer: nop
#
# entries-in-buffer/entries-written: 2/2 #P:12
#
# _-----=> irqs-off
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / delay
# TASK-PID CPU# |||| TIMESTAMP FUNCTION
# | | | |||| | |
ftracetest-26474 [009] d..1 79417.143782: Unknown type 1099
ftracetest-26498 [009] d..1 79417.208034: Unknown type 1101
Link: http://lkml.kernel.org/r/1415239470-28705-2-git-send-email-namhyung@kernel.org
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Add a kprobes on ftrace testcase. The testcase verifies that
- enabling and disabling function tracing works on a function which
already contains a dynamic kprobe
- adding and removing a dynamic kprobe works on a function which is
already enabled for function tracing
Link: http://lkml.kernel.org/p/1413802323-5297-2-git-send-email-heiko.carstens@de.ibm.com
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Add two selftest scripts which tests kprobe-tracer as the startup
selftest does.
These test cases are testing that the kprobe_event can accept a
kprobe event with $stack related arguments and a kretprobe event
with $retval argument.
Link: http://lkml.kernel.org/p/20141008040307.13415.45145.stgit@kbuild-f20.novalocal
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Add XFAIL and POSIX 1003.3 standard codes (UNRESOLVED/
UNTESTED/UNSUPPORTED) as result codes. These are used for the
results that test case is expected to fail or unsupported
feature (by config).
To return these result code, this introduces exit_unresolved,
exit_untested, exit_unsupported and exit_xfail functions,
which use real-time signals to notify the result code to
ftracetest.
This also set "errexit" option for the testcases, so that
the tests don't need to exit explicitly.
Note that if the test returns UNRESOLVED/UNSUPPORTED/FAIL,
its test log including executed commands is shown on console
and main logfile as below.
------
# ./ftracetest samples/
=== Ftrace unit tests ===
[1] failure-case example [FAIL]
execute: /home/fedora/ksrc/linux-3/tools/testing/selftests/ftrace/samples/fail.tc
+ . /home/fedora/ksrc/linux-3/tools/testing/selftests/ftrace/samples/fail.tc
++ cat non-exist-file
cat: non-exist-file: No such file or directory
[2] pass-case example [PASS]
[3] unresolved-case example [UNRESOLVED]
execute: /home/fedora/ksrc/linux-3/tools/testing/selftests/ftrace/samples/unresolved.tc
+ . /home/fedora/ksrc/linux-3/tools/testing/selftests/ftrace/samples/unresolved.tc
++ trap exit_unresolved INT
++ kill -INT 29324
+++ exit_unresolved
+++ kill -s 38 29265
+++ exit 0
[4] unsupported-case example [UNSUPPORTED]
execute: /home/fedora/ksrc/linux-3/tools/testing/selftests/ftrace/samples/unsupported.tc
+ . /home/fedora/ksrc/linux-3/tools/testing/selftests/ftrace/samples/unsupported.tc
++ exit_unsupported
++ kill -s 40 29265
++ exit 0
[5] untested-case example [UNTESTED]
[6] xfail-case example [XFAIL]
# of passed: 1
# of failed: 1
# of unresolved: 1
# of untested: 1
# of unsupported: 1
# of xfailed: 1
# of undefined(test bug): 0
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Link: http://lkml.kernel.org/p/20140929120211.30203.99510.stgit@kbuild-f20.novalocal
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Add basic testcases for kprobe dynamic events.
This also shows that the ftracetest accepts sub-directory
for new testcases.
Link: http://lkml.kernel.org/p/20140922234254.23415.46964.stgit@kbuild-f20.novalocal
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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Masami Hiramatsu
Naveen N. Rao
Linus Torvalds
Alban Crequy
Ben Hutchings
Namhyung Kim
Heiko Carstens
Masami Hiramatsu