From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail191.messagelabs.com (mail191.messagelabs.com [216.82.242.19]) by kanga.kvack.org (Postfix) with ESMTP id 97BAF8D0080 for ; Tue, 16 Nov 2010 08:04:04 -0500 (EST) Received: from [10.10.7.10] by digidescorp.com (Cipher SSLv3:RC4-MD5:128) (MDaemon PRO v10.1.1) with ESMTP id md50001484960.msg for ; Tue, 16 Nov 2010 07:03:59 -0600 Subject: Re: [PATCH][RESEND] nommu: yield CPU periodically while disposing large VM From: "Steven J. Magnani" Reply-To: steve@digidescorp.com In-Reply-To: <20101115204703.fc774a17.akpm@linux-foundation.org> References: <1289507596-17613-1-git-send-email-steve@digidescorp.com> <20101111184059.5744a42f.akpm@linux-foundation.org> <1289831351.2524.15.camel@iscandar.digidescorp.com> <20101115204703.fc774a17.akpm@linux-foundation.org> Content-Type: text/plain; charset="UTF-8" Date: Tue, 16 Nov 2010 07:03:57 -0600 Message-ID: <1289912637.3449.3.camel@iscandar.digidescorp.com> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Greg Ungerer , KOSAKI Motohiro List-ID: On Mon, 2010-11-15 at 20:47 -0800, Andrew Morton wrote: > On Mon, 15 Nov 2010 08:29:11 -0600 "Steven J. Magnani" 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: email@kvack.org