events: Ensure that timers are updated without requiring read() call
authorEric B Munson <emunson@mgebm.net>
Fri, 24 Jun 2011 16:26:26 +0000 (12:26 -0400)
committerIngo Molnar <mingo@elte.hu>
Fri, 1 Jul 2011 09:06:34 +0000 (11:06 +0200)
commit0d6412085b7ff58612af52e51ffa864f0df4b8fd
treeb0aa2622aa0262b1238b07fad38d76c9c61d6e32
parentc4794295917ebeda8013b6cb9c8d71ab4f74a1fa
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@mgebm.net>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1308932786-5111-1-git-send-email-emunson@mgebm.net
Signed-off-by: Ingo Molnar <mingo@elte.hu>
kernel/events/core.c