linux-kernel - Re: [patch 3/3] vmstat: Create our own workqueue

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Message-Id: <201510311143.BIH87000.tOSVFHOFJMLFOQ@I-love.SAKURA.ne.jp>
Date:	Sat, 31 Oct 2015 11:43:00 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	cl@...ux.com
Cc:	htejun@...il.com, akpm@...ux-foundation.org, mhocko@...nel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	torvalds@...ux-foundation.org, hannes@...xchg.org, mgorman@...e.de
Subject: Re: [patch 3/3] vmstat: Create our own workqueue

Christoph Lameter wrote:
> On Thu, 29 Oct 2015, Tejun Heo wrote:
> 
> > Wait, this series doesn't include Tetsuo's change.  Of course it won't
> > fix the deadlock problem.  What's necessary is Tetsuo's patch +
> > WQ_MEM_RECLAIM.
> 
> This series is only dealing with vmstat changes. Do I get an ack here?
> 

Then, you need to update below description (or drop it) because
patch 3/3 alone will not guarantee that the counters are up to date.

  Christoph Lameter wrote:
  > Seems that vmstat needs its own workqueue now since the general
  > workqueue mechanism has been *enhanced* which means that the
  > vmstat_updates cannot run reliably but are being blocked by
  > work requests doing memory allocation. Which causes vmstat
  > to be unable to keep the counters up to date.

I am waiting for decision from candidates listed at
http://lkml.kernel.org/r/201510251952.CEF04109.OSOtLFHFVFJMQO@I-love.SAKURA.ne.jp .
If your series is not for backporting, please choose one from
the candidates. Can you accept the original patch at
http://lkml.kernel.org/r/201510212126.JIF90648.HOOFJVFQLMStOF@I-love.SAKURA.ne.jp
which implements (1) from the candidates?
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