linux-kernel - Re: [PATCH] add check do_direct

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Message-Id: <1185923052.31134.24.camel@dyn9047017100.beaverton.ibm.com>
Date:	Tue, 31 Jul 2007 16:04:12 -0700
From:	Badari Pulavarty <pbadari@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Joe Jin <joe.jin@...cle.com>, Zach Brown <zach.brown@...cle.com>,
	gurudas pai <gurudas.pai@...cle.com>,
	torvalds@...ux-foundation.org, jens.axboe@...cle.com,
	lkml <linux-kernel@...r.kernel.org>, wen.gang.wang@...cle.com
Subject: Re: [PATCH] add check do_direct_IO() return val

On Tue, 2007-07-31 at 15:34 -0700, Andrew Morton wrote:
> On Tue, 31 Jul 2007 15:25:11 -0700
> Badari Pulavarty <pbadari@...ibm.com> wrote:
> 
> > +	dio->map_bh.b_state = 0;
> 
> ho hum, thanks.
> 
> We zero out so many fields in there now that a kzalloc() might yield
> a net gain.  0.000001% in an unnamed benchmark!

Yep. I think its worth doing a kzalloc(). I wanted to understand the
*actual*  problem to make sure we are addressing it, rather than 
kzalloc() made it disappear.

Thanks,
Badari

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