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From: Marcelo Tosatti <mtosatti@redhat.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-rt-users@vger.kernel.org,
	Juri Lelli <juri.lelli@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [patch 2/2] mm: page_alloc: drain pages remotely
Date: Wed, 17 Jun 2020 07:12:12 -0300
Message-ID: <20200617101212.GB392445@fuller.cnet> (raw)
In-Reply-To: <20200617074617.p4m5l5uu5urmagsc@linutronix.de>

On Wed, Jun 17, 2020 at 09:46:17AM +0200, Sebastian Andrzej Siewior wrote:
> On 2020-06-16 14:04:25 [-0300], Marcelo Tosatti wrote:
> > It is affected. The workqueue thread for a given CPU is SCHED_OTHER, which can't
> > interrupt a SCHED_FIFO task which does not sleep.
> 
> Okay. So it is a problem which exists independently of -RT.
> As I pointed out to Juri, vmstat_update() should have the very same
> problem, correct?

Yes.


      reply index

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16 16:11 [patch 0/2] re-enable remote per-cpu-pages draining Marcelo Tosatti
2020-06-16 16:11 ` [patch 1/2] rt: add local_lock_on and local_lock_irqsave_on to locallock.h Marcelo Tosatti
2020-06-16 16:11 ` [patch 2/2] mm: page_alloc: drain pages remotely Marcelo Tosatti
2020-06-16 16:32   ` Sebastian Andrzej Siewior
2020-06-16 16:55     ` Marcelo Tosatti
2020-06-17  7:42       ` Sebastian Andrzej Siewior
2020-06-17 10:11         ` Marcelo Tosatti
2020-06-17 12:01           ` Sebastian Andrzej Siewior
2020-06-16 17:04     ` Marcelo Tosatti
2020-06-17  7:46       ` Sebastian Andrzej Siewior
2020-06-17 10:12         ` Marcelo Tosatti [this message]

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