linux-kernel - Re: [PATCH 1/4] mm, rmap: do easy-job first in anon_vma

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Date:	Wed, 7 Aug 2013 16:16:24 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Johannes Weiner <hannes@...xchg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Minchan Kim <minchan@...nel.org>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH 1/4] mm, rmap: do easy-job first in anon_vma_fork

Hello, Johannes.

On Tue, Aug 06, 2013 at 08:58:54AM -0400, Johannes Weiner wrote:
> >  	if (anon_vma_clone(vma, pvma))
> > -		return -ENOMEM;
> > -
> > -	/* Then add our own anon_vma. */
> > -	anon_vma = anon_vma_alloc();
> > -	if (!anon_vma)
> > -		goto out_error;
> > -	avc = anon_vma_chain_alloc(GFP_KERNEL);
> > -	if (!avc)
> >  		goto out_error_free_anon_vma;
> 
> Which heavy work?  anon_vma_clone() is anon_vma_chain_alloc() in a
> loop.
> 
> Optimizing error paths only makes sense if they are common and you
> actually could save something by reordering.  This matches neither.

Yes, you are right. I drop this one.

Thanks.
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