linux-kernel - Re: [PATCH 1/4] vmscan: simplify shrink_inactive

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Date:	Thu, 15 Apr 2010 17:01:36 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Mel Gorman <mel@....ul.ie>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Dave Chinner <david@...morbit.com>,
	Chris Mason <chris.mason@...cle.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/4] vmscan: simplify shrink_inactive_list()

Mel Gorman <mel@....ul.ie> writes:
>
> $ stack-o-meter vmlinux-vanilla vmlinux-2-simplfy-shrink 
> add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-144 (-144)
> function                                     old     new   delta
> shrink_zone                                 1232    1160     -72
> kswapd                                       748     676     -72

And the next time someone adds a new feature to these code paths or
the compiler inlines differently these 72 bytes are easily there
again. It's not really a long term solution. Code is tending to get
more complicated all the time. I consider it unlikely this trend will
stop any time soon.

So just doing some stack micro optimizations doesn't really help 
all that much.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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