From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail6.bemta7.messagelabs.com (mail6.bemta7.messagelabs.com [216.82.255.55]) by kanga.kvack.org (Postfix) with ESMTP id 697906B002C for ; Wed, 12 Oct 2011 17:09:18 -0400 (EDT) From: Satoru Moriya Date: Wed, 12 Oct 2011 17:08:57 -0400 Subject: RE: [PATCH -v2 -mm] add extra free kbytes tunable Message-ID: <65795E11DBF1E645A09CEC7EAEE94B9CB516D055@USINDEVS02.corp.hds.com> References: <20110901105208.3849a8ff@annuminas.surriel.com> <20110901100650.6d884589.rdunlap@xenotime.net> <20110901152650.7a63cb8b@annuminas.surriel.com> <20111010153723.6397924f.akpm@linux-foundation.org> <65795E11DBF1E645A09CEC7EAEE94B9CB516CBC4@USINDEVS02.corp.hds.com> <20111011125419.2702b5dc.akpm@linux-foundation.org> <65795E11DBF1E645A09CEC7EAEE94B9CB516CBFE@USINDEVS02.corp.hds.com> <20111011135445.f580749b.akpm@linux-foundation.org> In-Reply-To: <20111011135445.f580749b.akpm@linux-foundation.org> Content-Language: en-US Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: David Rientjes , Rik van Riel , Randy Dunlap , Satoru Moriya , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "lwoodman@redhat.com" , Seiji Aguchi , "hughd@google.com" , "hannes@cmpxchg.org" On 10/11/2011 04:54 PM, Andrew Morton wrote: > On Tue, 11 Oct 2011 16:23:22 -0400 > Satoru Moriya wrote: > >> Also, if we increase the free-page reserves a.k.a min_free_kbytes,=20 >> the possibility of direct reclaim on other workloads increases. >> I think it's a bad side effect. >=20 > extra_free_kbytes has the same side-effect. I don't think so. If we make low watermark bigger to increase free-page reserves by extra_free_kbytes, the possibility of direct reclaim on other workload does not increase directly because min watermark is not changed.=20 Of course, as David pointed out, other workloads may incur a regression because kswapd uses more cpu time. Thanks, Satoru -- 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 internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org