From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Mikulas Patocka <mpatocka@redhat.com>,
Mike Snitzer <snitzer@redhat.com>,
Alasdair Kergon <agk@redhat.com>, Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, dm-devel@redhat.com,
Joe Thornber <ejt@redhat.com>
Subject: Re: [RFC][PATCH] dm: Remove dm_bufio_cond_resched()
Date: Fri, 23 Sep 2016 11:05:24 +0200 [thread overview]
Message-ID: <20160923090524.GE5008@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <alpine.DEB.2.20.1609230956540.5640@nanos>
On Fri, Sep 23, 2016 at 10:00:37AM +0200, Thomas Gleixner wrote:
> On Fri, 23 Sep 2016, Peter Zijlstra wrote:
> > It is, might_sleep() implies might_resched(). In fact, that's all what
> > PREEMPT_VOLUNTARY is, make the might_sleep() debug test imply a resched
> > point.
>
> Grr, how intuitive - NOT!
No, it actually makes sense. Because you 'obviously' only call
might_sleep() in contexts that should be able to sleep (if not, it'll
holler). So they're already placed right for preemption.
next prev parent reply other threads:[~2016-09-23 9:05 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-13 8:45 [RFC][PATCH] dm: Remove dm_bufio_cond_resched() Peter Zijlstra
2016-09-13 12:49 ` Thomas Gleixner
2016-09-13 13:39 ` Mike Snitzer
2016-09-19 10:53 ` Peter Zijlstra
2016-09-22 20:53 ` Mikulas Patocka
2016-09-22 20:59 ` Thomas Gleixner
2016-09-23 7:34 ` Peter Zijlstra
2016-09-23 8:00 ` Thomas Gleixner
2016-09-23 9:05 ` Peter Zijlstra [this message]
2016-09-23 9:13 ` Thomas Gleixner
2016-09-23 9:26 ` Ingo Molnar
2016-09-23 12:17 ` Mike Galbraith
2016-09-23 12:26 ` Peter Zijlstra
2016-09-23 12:39 ` Mike Galbraith
2016-09-23 12:42 ` Mike Snitzer
2016-09-23 12:46 ` Peter Zijlstra
2016-09-23 14:32 ` [dm-devel] " Bart Van Assche
2016-09-19 9:49 ` Mikulas Patocka
2016-09-19 10:47 ` Peter Zijlstra
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