Messages in this thread | | | From | Frederic Weisbecker <> | Subject | [PATCH 0/2] nohz: Avoid double clock write | Date | Thu, 31 Jul 2014 18:45:54 +0200 |
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Hi Thomas,
The tick reschedules itself unconditionally. That's what we want as long as the CPU is in periodic mode. It's not that relevant when the CPU is in dynticks mode though as the clock write is likely to be overwritten by the nohz code on irq exit.
In low-res mode, that even result in unexpected periodic behaviour when no timer is scheduled in the future.
So here is a set that proposes the removal of these double writes.
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git origin/nohz/drop-double-write-v2
Thanks, Frederic ---
Viresh Kumar (2): nohz: Fix spurious periodic tick behaviour in low-res dynticks mode nohz: Avoid tick's double reprogramming in highres mode
kernel/time/tick-sched.c | 8 ++++++++ 1 file changed, 8 insertions(+)
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