Messages in this thread | | | Date | Wed, 29 Jan 2014 15:39:36 -0800 | From | "Paul E. McKenney" <> | Subject | [GIT PULL timers] Timer-wheel bandaids^Wcommits |
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Hello, Ingo,
This pull request contains latency bandaids^Woptimizations to the timer-wheel code that are useful in conjunction with NO_HZ_FULL Kconfig option. These optimizations reduce the jiffy-by-jiffy looping in cases where there is either zero or one timers in the timer wheel, which is a common case for NO_HZ_FULL "worker" CPUs that run almost entirely in usermode for a single task.
Each of these commits has at least two Reviewed-by, one Acked-by, and one Tested-by tag, so they are ready for more extensive testing in -tip.
Thanx, Paul
The following changes since commit 00e2bcd6d35f59fce7fa0e76e24d08f74c6a8506:
clocksource: Timer-sun5i: Switch to sched_clock_register() (2014-01-19 13:23:23 +0100)
are available in the git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/timers
for you to fetch changes up to 6f089d0be7fef9705b3a7755b05d1092e772b910:
timers: Make internal_add_timer() update ->next_timer if ->active_timers == 0 (2014-01-29 15:25:16 -0800)
---------------------------------------------------------------- Oleg Nesterov (1): timers: Make internal_add_timer() update ->next_timer if ->active_timers == 0
Paul E. McKenney (4): timers: Track total number of timers in list timers: Reduce __run_timers() latency for empty list timers: Reduce future __run_timers() latency for newly emptied list timers: Reduce future __run_timers() latency for first add to empty list
kernel/timer.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-)
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