Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753227AbbLRG7L (ORCPT ); Fri, 18 Dec 2015 01:59:11 -0500 Received: from mga02.intel.com ([134.134.136.20]:34687 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751907AbbLRG7K convert rfc822-to-8bit (ORCPT ); Fri, 18 Dec 2015 01:59:10 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,445,1444719600"; d="scan'208";a="874056317" From: "Luck, Tony" To: Kamezawa Hiroyuki , Xishi Qiu CC: "Izumi, Taku" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" , "akpm@linux-foundation.org" , "mel@csn.ul.ie" , "Hansen, Dave" , "matt@codeblueprint.co.uk" Subject: RE: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option Thread-Topic: [PATCH v3 2/2] mm: Introduce kernelcore=mirror option Thread-Index: AQHRMjAhAQ0e9br7T0uYMif+yG96M57ChRIAgACu/pCAAL3uAIAASYOAgAAKFICAAYydgIAAQHeAgAjmdICAABNEAIAAAY+AgAAgD4CAAAPQAIAAUa3QgAERRID//8h9sA== Date: Fri, 18 Dec 2015 06:59:08 +0000 Message-ID: <3908561D78D1C84285E8C5FCA982C28F39F88DAC@ORSMSX114.amr.corp.intel.com> References: <1449631109-14756-1-git-send-email-izumi.taku@jp.fujitsu.com> <1449631177-14863-1-git-send-email-izumi.taku@jp.fujitsu.com> <56679FDC.1080800@huawei.com> <3908561D78D1C84285E8C5FCA982C28F39F7F4CD@ORSMSX114.amr.corp.intel.com> <5668D1FA.4050108@huawei.com> <56691819.3040105@huawei.com> <566A9AE1.7020001@huawei.com> <56722258.6030800@huawei.com> <567223A7.9090407@jp.fujitsu.com> <56723E8B.8050201@huawei.com> <567241BE.5030806@jp.fujitsu.com> <3908561D78D1C84285E8C5FCA982C28F39F882E8@ORSMSX114.amr.corp.intel.com> <56736B7D.3040709@jp.fujitsu.com> In-Reply-To: <56736B7D.3040709@jp.fujitsu.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-titus-metadata-40: eyJDYXRlZ29yeUxhYmVscyI6IiIsIk1ldGFkYXRhIjp7Im5zIjoiaHR0cDpcL1wvd3d3LnRpdHVzLmNvbVwvbnNcL0ludGVsMyIsImlkIjoiOTg1NDcxZjEtMTc4My00YTMxLThiMGItYmM5MTQ1NGI1OWIxIiwicHJvcHMiOlt7Im4iOiJDVFBDbGFzc2lmaWNhdGlvbiIsInZhbHMiOlt7InZhbHVlIjoiQ1RQX0lDIn1dfV19LCJTdWJqZWN0TGFiZWxzIjpbXSwiVE1DVmVyc2lvbiI6IjE1LjQuMTAuMTkiLCJUcnVzdGVkTGFiZWxIYXNoIjoidVdhb2phSHNNUXNoTDVOampKWlUydDBHQ0hvSEtma201VHJOWTFQQll1WT0ifQ== x-ctpclassification: CTP_IC x-originating-ip: [10.22.254.139] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1239 Lines: 25 >Hmm...like this ? > sysctl.vm.fallback_mirror_memory = 0 // never fallback # default. > sysctl.vm.fallback_mirror_memory = 1 // the user memory may be allocated from mirrored zone. > sysctl.vm.fallback_mirror_memory = 2 // usually kernel allocates memory from mirrored zone before OOM. > sysctl.vm.fallback_mirror_memory = 3 // 1+2 Should option 2 say: // allow kernel to allocate from non-mirror zone to avoid OOM > However I believe my customer's choice is always 0, above implementation can be done in a clean way. > (adding a flag to zones (mirrored or not) and controlling fallback zonelist walk.) Modes allow us to make all of the people happy (I hope). > BTW, we need this Taku's patch to make a progress. I think other devs should be done in another > development cycle. What does he need to get your Acks ? The concept is great. It's even "Tested-by: Tony Luck ". I need to read the code more carefully before Acked-by. -Tony -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/