linux-kernel - Re: [PATCH 20/32] aio: Give shared kioctx fields their own cachelines

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Message-ID: <20130107234820.GJ26407@google.com>
Date:	Mon, 7 Jan 2013 15:48:20 -0800
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, linux-aio@...ck.org,
	linux-fsdevel@...r.kernel.org, zab@...hat.com, bcrl@...ck.org,
	jmoyer@...hat.com, axboe@...nel.dk, viro@...iv.linux.org.uk,
	tytso@....edu
Subject: Re: [PATCH 20/32] aio: Give shared kioctx fields their own cachelines

On Thu, Jan 03, 2013 at 03:25:12PM -0800, Andrew Morton wrote:
> On Wed, 26 Dec 2012 17:59:59 -0800
> Kent Overstreet <koverstreet@...gle.com> wrote:
> 
> >  	struct {
> > -		struct mutex	ring_lock;
> > +		atomic_t	reqs_active;
> >  	} ____cacheline_aligned;
> 
> Is there a reason why this guy remains aligned on CONFIG_SMP=n?

No good one, but I see you've already fixed it in your tree.
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