linux-kernel - Re: [PATCH][RESEND] nommu: yield CPU periodically while disposing large VM

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Message-ID: <1289912637.3449.3.camel@iscandar.digidescorp.com>
Date:	Tue, 16 Nov 2010 07:03:57 -0600
From:	"Steven J. Magnani" <steve@...idescorp.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Greg Ungerer <gerg@...pgear.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH][RESEND] nommu: yield CPU periodically while disposing
 large VM

On Mon, 2010-11-15 at 20:47 -0800, Andrew Morton wrote:
> On Mon, 15 Nov 2010 08:29:11 -0600 "Steven J. Magnani" <steve@...idescorp.com> wrote:
> 
> > As efficient as schedule() may be, it still scares me to call it on
> > reclaim of every block of memory allocated by a terminating process,
> > particularly on the relatively slow processors that inhabit NOMMU land.
> 
> This is cond_resched(), not schedule()!  cond_resched() is just a few
> instructions, except for the super-rare case where it calls schedule().

The light comes on..._cond_resched() is overloaded. I was looking at the
static version, which calls schedule(). The extern version is much more
lightweight.

I'll respin the patch.

Thanks,
------------------------------------------------------------------------
 Steven J. Magnani               "I claim this network for MARS!
 www.digidescorp.com              Earthling, return my space modulator!"

 #include <standard.disclaimer>



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