Re: [PATCH 0/2] nohz: Avoid double clock write
From: Frederic Weisbecker
Date: Mon Aug 11 2014 - 19:00:29 EST
On Thu, Jul 31, 2014 at 06:45:54PM +0200, Frederic Weisbecker wrote:
> 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.
> 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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