linux-kernel - Re: [PATCH] cpuset: mm: Reduce large amounts of memory barrier related damage v3

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Message-ID: <1332760047.16159.93.camel@twins>
Date:	Mon, 26 Mar 2012 13:07:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Miao Xie <miaox@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Christoph Lameter <cl@...ux.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpuset: mm: Reduce large amounts of memory barrier
 related damage v3

On Mon, 2012-03-26 at 12:56 +0200, Peter Zijlstra wrote:
>  static inline bool put_mems_allowed(unsigned int seq)
>  {
> -       return !read_seqcount_retry(&current->mems_allowed_seq, seq);
> +       return likely(!read_seqcount_retry(&current->mems_allowed_seq, seq));
>  } 

Ignore this hunk, read_seqcount_retry() already has a branch hint in.
I'll send a new version if people thing the rest of the patch is worth
it.
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