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| author |   Masami Hiramatsu <mhiramat@kernel.org> | 2019-11-18 17:12:30 +0900 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-11-18 19:03:38 -0300 |
| commit | 72363540c009db5014252a1a15e149d30f88bcc3 (patch) | |
| tree | 7ed7280e33e8eac0015570922f9ada1bb6f79282 /tools/perf/util/probe-file.h | |
| parent | perf probe: Generate event name with line number (diff) | |
| download | linux-dev-72363540c009db5014252a1a15e149d30f88bcc3.tar.xz linux-dev-72363540c009db5014252a1a15e149d30f88bcc3.zip | |
perf probe: Support multiprobe event
Support multiprobe event if the event is based on function and lines and
kernel supports it. In this case, perf probe creates the first probe
with an event, and tries to append following probes on that event, since
those probes must be on the same source code line.
Before this patch;
# perf probe -a vfs_read:18
Added new events:
probe:vfs_read_L18 (on vfs_read:18)
probe:vfs_read_L18_1 (on vfs_read:18)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_read_L18_1 -aR sleep 1
#
After this patch (on multiprobe supported kernel)
# perf probe -a vfs_read:18
Added new events:
probe:vfs_read_L18 (on vfs_read:18)
probe:vfs_read_L18 (on vfs_read:18)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_read_L18 -aR sleep 1
#
Committer testing:
On a kernel that doesn't support multiprobe events, after this patch:
# uname -a
Linux quaco 5.3.8-200.fc30.x86_64 #1 SMP Tue Oct 29 14:46:22 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux
# grep append /sys/kernel/debug/tracing/README
be modified by appending '.descending' or '.ascending' to a
can be modified by appending any of the following modifiers
#
# perf probe -a vfs_read:18
Added new events:
probe:vfs_read_L18 (on vfs_read:18)
probe:vfs_read_L18_1 (on vfs_read:18)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_read_L18_1 -aR sleep 1
# perf probe -l
probe:vfs_read_L18 (on vfs_read:18@fs/read_write.c)
probe:vfs_read_L18_1 (on vfs_read:18@fs/read_write.c)
#
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Tom Zanussi <tom.zanussi@linux.intel.com>
Link: http://lore.kernel.org/lkml/157406475010.24476.586290752591512351.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/probe-file.h')
| -rw-r--r-- | tools/perf/util/probe-file.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/probe-file.h b/tools/perf/util/probe-file.h index 986c1c94f64f..850d1b52d60a 100644 --- a/tools/perf/util/probe-file.h +++ b/tools/perf/util/probe-file.h @@ -71,6 +71,7 @@ bool probe_type_is_available(enum probe_type type); bool kretprobe_offset_is_supported(void); bool uprobe_ref_ctr_is_supported(void); bool user_access_is_supported(void); +bool multiprobe_event_is_supported(void); #else /* ! HAVE_LIBELF_SUPPORT */ static inline struct probe_cache *probe_cache__new(const char *tgt __maybe_unused, struct nsinfo *nsi __maybe_unused) { |