linux-kernel - Re: [PATCH 17/19] fs: buffer: Do not use unnecessary atomic operations when discarding buffers

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Message-ID: <20140513143050.GU23991@suse.de>
Date:	Tue, 13 May 2014 15:30:50 +0100
From:	Mel Gorman <mgorman@...e.de>
To:	Jan Kara <jack@...e.cz>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Vlastimil Babka <vbabka@...e.cz>,
	Michal Hocko <mhocko@...e.cz>, Hugh Dickins <hughd@...gle.com>,
	Dave Hansen <dave.hansen@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 17/19] fs: buffer: Do not use unnecessary atomic
 operations when discarding buffers

On Tue, May 13, 2014 at 03:49:43PM +0200, Jan Kara wrote:
> > > operation which is available on a lot of architectures, we'll be stuck
> > > with a cmpxchg loop instead :/
> > > 
> > > *sigh*
> > > 
> > > Anyway, nothing wrong with this patch, however, you could, if you really
> > > wanted to push things, also include BH_Lock in that clear :-)
> > 
> > That's a bold strategy Cotton.
> > 
> > Untested patch on top
>   Although this looks correct, I have to say I prefer the explicit
> unlock_buffer() unless this has a measurable benefit.
> 

I will keep this as a separate patch, move it to the end of the series
and check what the profiles look like. Thanks.

-- 
Mel Gorman
SUSE Labs
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