From: Tejun Heo <tj@kernel.org>
To: Adrian Hunter <adrian.hunter@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
Ulrich Obergfell <uobergfe@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH] workqueue: warn if memory reclaim tries to flush !WQ_MEM_RECLAIM workqueue
Date: Fri, 11 Mar 2016 12:52:16 -0500 [thread overview]
Message-ID: <20160311175216.GK24046@htj.duckdns.org> (raw)
In-Reply-To: <56E18EF6.1010006@intel.com>
Hello,
On Thu, Mar 10, 2016 at 05:12:54PM +0200, Adrian Hunter wrote:
> > @@ -2711,6 +2744,8 @@ static bool start_flush_work(struct work
> > pwq = worker->current_pwq;
> > }
> >
> > + check_flush_dependency(pwq->wq, work);
> > +
> > insert_wq_barrier(pwq, barr, work, worker);
> > spin_unlock_irq(&pool->lock);
>
> I am hitting the warnings when using cancel_delayed_work_sync(). I would
> have thought that forward progress would still be guaranteed in that case.
> Is it true that it is not?
I'm not sure I understand what you're trying to say. If you're trying
to do cancel_delayed_work_sync() from a memreclaim wq on a work item
which is executing on !memreclaim wq, that'd be an incorrect thing to
do as that can deadlock the memreclaim wq under memory pressure.
Thanks.
--
tejun
prev parent reply other threads:[~2016-03-11 17:52 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-03 0:28 [PATCH 1/2] watchdog: introduce touch_softlockup_watchdog_sched() Tejun Heo
2015-12-03 0:28 ` [PATCH 2/2] workqueue: implement lockup detector Tejun Heo
2015-12-03 14:49 ` Tejun Heo
2015-12-03 17:50 ` Don Zickus
2015-12-03 19:43 ` Tejun Heo
2015-12-03 20:12 ` Ulrich Obergfell
2015-12-03 20:54 ` Tejun Heo
2015-12-04 8:02 ` Ingo Molnar
2015-12-04 16:52 ` Don Zickus
2015-12-04 13:19 ` Ulrich Obergfell
2015-12-07 19:06 ` [PATCH v2 " Tejun Heo
2015-12-07 21:38 ` Don Zickus
2015-12-07 21:39 ` Tejun Heo
2015-12-08 16:00 ` Don Zickus
2015-12-08 16:31 ` Tejun Heo
2015-12-03 9:33 ` [PATCH 1/2] watchdog: introduce touch_softlockup_watchdog_sched() Peter Zijlstra
2015-12-03 10:00 ` Peter Zijlstra
2015-12-03 14:48 ` Tejun Heo
2015-12-03 15:04 ` Peter Zijlstra
2015-12-03 15:06 ` Tejun Heo
2015-12-03 19:26 ` [PATCH] workqueue: warn if memory reclaim tries to flush !WQ_MEM_RECLAIM workqueue Tejun Heo
2015-12-03 20:43 ` Peter Zijlstra
2015-12-03 20:56 ` Tejun Heo
2015-12-03 21:09 ` Peter Zijlstra
2015-12-03 22:04 ` Tejun Heo
2015-12-04 12:51 ` Peter Zijlstra
2015-12-07 15:58 ` Tejun Heo
2016-01-26 17:38 ` Thierry Reding
2016-01-28 10:12 ` Peter Zijlstra
2016-01-28 12:47 ` Thierry Reding
2016-01-28 12:48 ` Thierry Reding
2016-01-29 11:09 ` Tejun Heo
2016-01-29 15:17 ` Peter Zijlstra
2016-01-29 18:28 ` Tejun Heo
2016-01-29 10:59 ` [PATCH wq/for-4.5-fixes] workqueue: skip flush dependency checks for legacy workqueues Tejun Heo
2016-01-29 15:07 ` Thierry Reding
2016-01-29 18:32 ` Tejun Heo
2016-02-02 6:54 ` Archit Taneja
2016-03-10 15:12 ` [PATCH] workqueue: warn if memory reclaim tries to flush !WQ_MEM_RECLAIM workqueue Adrian Hunter
2016-03-11 17:52 ` Tejun Heo [this message]
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