diff options
| author | Jiri Olsa <jolsa@redhat.com> | 2014-09-08 16:31:07 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2014-09-16 10:30:36 +0200 |
| commit | c88f2096136416b261bd3647cc260935f6e95805 (patch) | |
| tree | 73fb420bd2e65cda6ef2c25a2e72f30e4399d262 /kernel/events/core.c | |
| parent | a08b6769d4c5e8d2a3192a45e40b3cdcca0da6a1 (diff) | |
perf: Do not check PERF_EVENT_STATE_EXIT on syscall read path
Revert PERF_EVENT_STATE_EXIT check on read syscall path.
It breaks standard way to read counter, which is to open
the counter, wait for the monitored process to die and
read the counter.
Reported-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Stephane Eranian <eranian@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: David Ahern <dsahern@gmail.com>
Link: http://lkml.kernel.org/r/20140908143107.GG17728@krava.brq.redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/events/core.c')
| -rw-r--r-- | kernel/events/core.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index f917dec6f897..733c61636f0d 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3601,8 +3601,7 @@ perf_read_hw(struct perf_event *event, char __user *buf, size_t count) * error state (i.e. because it was pinned but it couldn't be * scheduled on to the CPU at some point). */ - if ((event->state == PERF_EVENT_STATE_ERROR) || - (event->state == PERF_EVENT_STATE_EXIT)) + if (event->state == PERF_EVENT_STATE_ERROR) return 0; if (count < event->read_size) |