linux-kernel - Re: [PATCH v2] mempolicy: reduce references to the current

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Message-ID: <alpine.DEB.2.00.1104151634050.3847@chino.kir.corp.google.com>
Date:	Fri, 15 Apr 2011 16:35:02 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Namhyung Kim <namhyung@...il.com>
cc:	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] mempolicy: reduce references to the current

On Fri, 15 Apr 2011, Namhyung Kim wrote:

> Remove duplicated reference to the 'current' task using a local
> variable. Since refering the current can be a burden, it'd better
> cache the reference, IMHO. At least this saves some bytes on x86_64.
> 
>   $ size mempolicy-{old,new}.o
>      text    data    bss     dec     hex filename
>     25203    2448   9176   36827    8fdb mempolicy-old.o
>     25136    2448   9184   36768    8fa0 mempolicy-new.o
> 

So this is the opposite of what Andrew did in c06b1fca18c3 
(mm/page_alloc.c: don't cache `current' in a local) for the page 
allocator?
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