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a=rsa-sha256; c=relaxed/relaxed; d=fb.onmicrosoft.com; s=selector1-fb-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=wIsFOT/ThnSgY1/P/9Bwo6Ae2LKsIzQUi/sJaebZOAE=; b=gHJBA8WB5z48aIgXchriiOw8BjYlwgL82yTC5oYOpP/z6ybmPcw3rdTvbpx+KCw2xBm6eBEr2V1es3yQ8yiGLwbKyHFMjrCutdFiB0fV/4KqiAhEjaPkLyt3uQNwMjorjBasK/tNnebebguoe/0Pj5TQaMcQXpFg7bVMjTPLiMw= Received: from DM5PR15MB1883.namprd15.prod.outlook.com (10.174.247.135) by DM5SPR00MB335.namprd15.prod.outlook.com (10.173.225.150) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.1558.19; Wed, 30 Jan 2019 12:21:07 +0000 Received: from DM5PR15MB1883.namprd15.prod.outlook.com ([fe80::9c23:2db3:1e2a:4796]) by DM5PR15MB1883.namprd15.prod.outlook.com ([fe80::9c23:2db3:1e2a:4796%9]) with mapi id 15.20.1558.025; Wed, 30 Jan 2019 12:21:07 +0000 From: Chris Mason To: Dave Chinner CC: "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-xfs@vger.kernel.org" , Roman Gushchin , "akpm@linux-foundation.org" , "mhocko@kernel.org" , "vdavydov.dev@gmail.com" Subject: Re: [PATCH 1/2] Revert "mm: don't reclaim inodes with many attached pages" Thread-Topic: [PATCH 1/2] Revert "mm: don't reclaim inodes with many attached pages" Thread-Index: AQHUuFK1zOCFq26G8UWPT6kjO3PxRaXHu+OA Date: Wed, 30 Jan 2019 12:21:07 +0000 Message-ID: <25EAF93D-BC63-4409-AF21-F45B2DDF5D66@fb.com> References: <20190130041707.27750-1-david@fromorbit.com> <20190130041707.27750-2-david@fromorbit.com> In-Reply-To: <20190130041707.27750-2-david@fromorbit.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: MailMate (1.12.4r5594) x-clientproxiedby: BN3PR05CA0034.namprd05.prod.outlook.com (2603:10b6:400::44) To DM5PR15MB1883.namprd15.prod.outlook.com (2603:10b6:4:4f::7) x-ms-exchange-messagesentrepresentingtype: 1 x-originating-ip: [67.253.148.112] x-ms-publictraffictype: Email x-microsoft-exchange-diagnostics: 1;DM5SPR00MB335;20:Mx8BM8q4Vx1SSrQBx/fEAnQEplfrYSryiPi0ONzHsAE5VPGcTaDVNQkjLpK+sU01MT//izWKFZd+Bi4Yddb3CyB6KJH31o1oOm58H0zkNDGTD3rMAj6zBhv/pJ7HxdzfdgrHACCb3NVQ/7EyL+1JGMeaM+aEoACPc/gL7ECDfEA= x-ms-office365-filtering-correlation-id: cde1cef4-04bb-43d5-9709-08d686ad68f9 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600110)(711020)(4605077)(2017052603328)(7153060)(7193020);SRVR:DM5SPR00MB335; 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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: cde1cef4-04bb-43d5-9709-08d686ad68f9 X-MS-Exchange-CrossTenant-originalarrivaltime: 30 Jan 2019 12:21:05.9398 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5SPR00MB335 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-01-30_09:,, signatures=0 X-Proofpoint-Spam-Reason: safe X-FB-Internal: Safe X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 29 Jan 2019, at 23:17, Dave Chinner wrote: > From: Dave Chinner > > This reverts commit a76cf1a474d7dbcd9336b5f5afb0162baa142cf0. > > This change causes serious changes to page cache and inode cache > behaviour and balance, resulting in major performance regressions > when combining worklaods such as large file copies and kernel > compiles. > > https://bugzilla.kernel.org/show_bug.cgi?id=3D202441 I'm a little confused by the latest comment in the bz: https://bugzilla.kernel.org/show_bug.cgi?id=3D202441#c24 Are these reverts sufficient? Roman beat me to suggesting Rik's followup. We hit a different problem=20 in prod with small slabs, and have a lot of instrumentation on Rik's=20 code helping. -chris