From: Rik van Riel <riel@redhat.com>
To: Marcelo Tosatti <mtosatti@redhat.com>,
Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-kernel@vger.kernel.org, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: kernel/timer: avoid spurious ksoftirqd wakeups (v2)
Date: Mon, 06 Apr 2015 19:20:01 -0400 [thread overview]
Message-ID: <552314A1.9090800@redhat.com> (raw)
In-Reply-To: <20150406231557.GA5094@amt.cnet>
On 04/06/2015 07:15 PM, Marcelo Tosatti wrote:
>
>
> It is only necessary to raise timer softirq
> in case there are active timers.
>
> Limit the ksoftirqd wakeup to that case.
>
> Fixes a latency spike with isolated CPUs and
> nohz full mode.
>
> v2: fix variable initialization
> do not raise timer softirq due to pending irqwork
>
> Reported-and-tested-by: Luiz Capitulino <lcapitulino@redhat.com>
> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
--
All rights reversed
next prev parent reply other threads:[~2015-04-06 23:20 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-06 23:15 kernel/timer: avoid spurious ksoftirqd wakeups (v2) Marcelo Tosatti
2015-04-06 23:20 ` Rik van Riel [this message]
2015-04-07 21:10 ` Thomas Gleixner
2015-04-07 22:12 ` Frederic Weisbecker
2015-04-10 18:09 ` Marcelo Tosatti
2015-04-11 1:30 ` Luiz Capitulino
2015-04-11 9:25 ` Thomas Gleixner
2015-04-13 15:06 ` Luiz Capitulino
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