linux-kernel - Re: nohz fail (was: perf related boot hang.)

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Message-ID: <CAHg_5goeUsCP8zrZhkGyAvO3sPpt2VZFc5oNaQst9u0gSAmpdA@mail.gmail.com>
Date:	Thu, 4 Sep 2014 23:05:02 +0200
From:	Catalin Iacob <iacobcatalin@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Dave Jones <davej@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: nohz fail (was: perf related boot hang.)

On Thu, Sep 4, 2014 at 10:17 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> Yeah, that's expected. You need to apply the nine patches on top of -rc1:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
>         nohz/fixes
>
> "nohz: Restore NMI safe local irq work for local nohz kick" only fixes
> part of the issue.

Ok, but if the whole series is needed, isn't it better if it all goes
into 3.17? Otherwise 3.17 is a clear regression for some users; it's
definitely for me since before 3.17-rc1 I never saw this bug and now I
see it every time I do something CPU intensive. Maybe the regression
is acceptable because the it's confined to some CONFIG_NO_HZ_*
combination (I think) which is still rather experimental, that's your
call to make, but it's still a regression.
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