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

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Date:	Tue, 3 Nov 2015 01:52:13 +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 Sat, 31 Oct 2015, Tetsuo Handa wrote:
> 
> > 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.
> 
> The vmstat system does not guarantee that the counters are up to date
> always. The whole point is the deferral of updates for performance
> reasons. They are updated *at some point* within stat_interval. That needs
> to happen and that is what this patchset is fixing.
> 
I'm still unclear. I think that the result of this patchset is

  The counters are never updated even after stat_interval
  if some workqueue item is doing a __GFP_WAIT memory allocation.

but the patch description sounds as if

  The counters will be updated even if some workqueue item is
  doing a __GFP_WAIT memory allocation.

which denies the actual result I tested with this patchset applied.
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