From: Rik van Riel <riel@redhat.com>
To: Frederic Weisbecker <fweisbec@gmail.com>,
Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
James Hartsock <hartsjc@redhat.com>,
Ingo Molnar <mingo@kernel.org>
Subject: Re: [PATCH] nohz: Fix collision between tick and other hrtimers
Date: Sun, 25 Dec 2016 21:56:57 -0500 [thread overview]
Message-ID: <1482721017.11006.83.camel@redhat.com> (raw)
In-Reply-To: <1482596100-16494-1-git-send-email-fweisbec@gmail.com>
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On Sat, 2016-12-24 at 17:15 +0100, Frederic Weisbecker wrote:
> When the tick is stopped and an interrupt occurs afterward, we check
> on
> that interrupt exit if the next tick needs to be rescheduled. If it
> doesn't need any update, we don't want to do anything.
>
> In order to check if the tick needs an update, we compare it against
> the
> clockevent device deadline. Now that's a problem because the
> clockevent
> device is at a lower level than the tick itself if it is implemented
> on top of hrtimer.
Ohhhhh, good find. That is one subtle bug.
Acked-by: Rik van Riel <riel@redhat.com>
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next prev parent reply other threads:[~2016-12-26 2:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-24 16:15 [PATCH] nohz: Fix collision between tick and other hrtimers Frederic Weisbecker
2016-12-26 2:56 ` Rik van Riel [this message]
2016-12-26 16:40 ` Frederic Weisbecker
2016-12-26 23:44 ` Wanpeng Li
2016-12-29 16:42 ` Thomas Gleixner
2016-12-29 16:53 ` Frederic Weisbecker
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