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author | Thomas Gleixner <tglx@linutronix.de> | 2012-05-25 22:08:58 +0000 |
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committer | Thomas Gleixner <tglx@linutronix.de> | 2012-06-06 13:49:01 +0200 |
commit | 99d5f3aac674fe081ffddd2dbb8946ccbc14c410 (patch) | |
tree | d4a6cb5f0d4906f2ce983d2db8b4046b96706f53 /REPORTING-BUGS | |
parent | facbb4a7efbd658046bf615f03cd97a1504785d8 (diff) | |
download | op-kernel-dev-99d5f3aac674fe081ffddd2dbb8946ccbc14c410.zip op-kernel-dev-99d5f3aac674fe081ffddd2dbb8946ccbc14c410.tar.gz |
timers: Add accounting of non deferrable timers
The code in get_next_timer_interrupt() is suboptimal as it has to run
through the cascade to find the next expiring timer. On a completely
idle core we should only do that when there is an active timer
enqueued and base->next_timer does not give us a fast answer.
Add accounting of the active timers to the now consolidated
attach/detach code. I deliberately avoided sanity checks because the
code is fully symetric and any fiddling with timers w/o using the API
functions will lead to cute explosions anyway. ulong is big enough
even on 32bit and if we really run into the situation to have more
than 1<<32 timers enqueued there, then we are definitely not in a
state to go idle and run through that code.
This allows us to fix another shortcoming of get_next_timer_interrupt().
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Gilad Ben-Yossef <gilad@benyossef.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Link: http://lkml.kernel.org/r/20120525214819.236377028@linutronix.de
Diffstat (limited to 'REPORTING-BUGS')
0 files changed, 0 insertions, 0 deletions