diff options
| author | Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> | 2015-09-03 20:07:50 -0700 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-09-13 11:27:28 +0200 |
| commit | 7d88962e230c8342080e7e2fe9dd5be43dc13b79 (patch) | |
| tree | 6a74bd3eff85ef018877b85de360f0ede033db7c /include/linux/perf_event.h | |
| parent | fa8c269353d560b7c28119ad7617029f92e40b15 (diff) | |
| download | lwn-7d88962e230c8342080e7e2fe9dd5be43dc13b79.tar.gz lwn-7d88962e230c8342080e7e2fe9dd5be43dc13b79.zip | |
perf/core: Add return value for perf_event_read()
When we implement the ability to read several counters at once (using
the PERF_PMU_TXN_READ transaction interface), perf_event_read() can
fail when the 'group' parameter is true (eg: trying to read too many
events at once).
For now, have perf_event_read() return an integer. Ignore the return
value when the 'group' parameter is false.
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/1441336073-22750-8-git-send-email-sukadev@linux.vnet.ibm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/perf_event.h')
0 files changed, 0 insertions, 0 deletions