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Date:	Tue, 09 Jun 2015 21:47:51 -0700
From:	Joe Perches <joe@...ches.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Hocko <mhocko@...e.cz>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, sergey.senozhatsky.work@...il.com
Subject: Re: [RFC][PATCH 0/5] do not dereference NULL pools in pools'
 destroy() functions

On Tue, 2015-06-09 at 19:17 -0700, Andrew Morton wrote:
> On Tue, 9 Jun 2015 21:00:58 -0500 (CDT) Christoph Lameter <cl@...ux.com> wrote:
> > On Tue, 9 Jun 2015, Andrew Morton wrote:
> > > > Why do this at all?
> > Did some grepping and I did see some call sites that do this but the
> > majority has to do other processing as well.
> > 
> > 200 call sites? Do we have that many uses of caches? Typical prod system
> > have ~190 caches active and the merging brings that down to half of that.
> I didn't try terribly hard.
> z:/usr/src/linux-4.1-rc7> grep -r -C1 kmem_cache_destroy .  | grep "if [(]" | wc -l
> 158
> 
> It's a lot, anyway.

Yeah.

$ git grep -E -B1 -w "(kmem_cache|mempool|dma_pool)_destroy" *| \
  grep -P "\bif\s*\(" | wc -l
268


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