linux-kernel - Re: [PATCH] mm: vmscan: remove redundant querying to shrinker

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Message-ID: <20130614111034.GA306@gmail.com>
Date:	Fri, 14 Jun 2013 20:10:34 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Heesub Shin <heesub.shin@...sung.com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mgorman@...e.de, riel@...hat.com,
	kyungmin.park@...sung.com, d.j.shin@...sung.com,
	sunae.seo@...sung.com
Subject: Re: [PATCH] mm: vmscan: remove redundant querying to shrinker


Hello,

On Fri, Jun 14, 2013 at 07:07:51PM +0900, Heesub Shin wrote:
> shrink_slab() queries each slab cache to get the number of
> elements in it. In most cases such queries are cheap but,
> on some caches. For example, Android low-memory-killer,
> which is operates as a slab shrinker, does relatively
> long calculation once invoked and it is quite expensive.

LMK as shrinker is really bad, which everybody didn't want
when we reviewed it a few years ago so that's a one of reason
LMK couldn't be promoted to mainline yet. So your motivation is
already not atrractive. ;-)

> 
> This patch removes redundant queries to shrinker function
> in the loop of shrink batch.

I didn't review the patch and others don't want it, I guess.
Because slab shrink is under construction and many patches were
already merged into mmtom. Please look at latest mmotm tree.

	git://git.kernel.org/pub/scm/linux/kernel/git/mhocko/mm.git

If you concern is still in there and it's really big concern of MM
we should take care, NOT LMK, plese, resend it.

Thanks.

-- 
Kind regards,
Minchan Kim
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