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Message-Id: <1308838537-6682-1-git-send-email-emunson@mgebm.net> Date: Thu, 23 Jun 2011 10:15:37 -0400 From: Eric B Munson <emunson@...bm.net> To: mingo@...e.hu Cc: a.p.zijlstra@...llo.nl, borislav.petkov@....com, bblum@...rew.cmu.edu, linux-kernel@...r.kernel.org, mhack@...ibm.com, Eric B Munson <emunson@...bm.net> Subject: [PATCH] events: Ensure that timers are updated without requiring read() call The event tracing infrastructure exposes two timers which should be updated each time the value of the counter is updated. Currently, these counters are only updated when userspace calls read() on the fd associated with an event. This means that counters which are read via the mmap'd page exclusively never have their timers updated. This patch adds ensures that the timers are updated each time the values in the mmap'd page are updated. Signed-off-by: Eric B Munson <emunson@...bm.net> --- kernel/events/core.c | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/kernel/events/core.c b/kernel/events/core.c index 9efe710..3dd4ebe 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -3369,6 +3369,7 @@ void perf_event_update_userpage(struct perf_event *event) struct perf_buffer *buffer; rcu_read_lock(); + update_event_times(event); buffer = rcu_dereference(event->buffer); if (!buffer) goto unlock; -- 1.7.4.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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