Commit-ID: c88f2096136416b261bd3647cc260935f6e95805 Gitweb: http://git.kernel.org/tip/c88f2096136416b261bd3647cc260935f6e95805 Author: Jiri Olsa <jolsa@xxxxxxxxxx> AuthorDate: Mon, 8 Sep 2014 16:31:07 +0200 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Tue, 16 Sep 2014 10:30:36 +0200 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@xxxxxxxxxx> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx> Acked-by: Stephane Eranian <eranian@xxxxxxxxxx> Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx> Cc: Namhyung Kim <namhyung@xxxxxxxxxx> Cc: Paul Mackerras <paulus@xxxxxxxxx> Cc: Stephane Eranian <eranian@xxxxxxxxxx> Cc: David Ahern <dsahern@xxxxxxxxx> Link: http://lkml.kernel.org/r/20140908143107.GG17728@xxxxxxxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/events/core.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index f917dec..733c616 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) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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