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Wed, 11 Mar 2020 17:35:30 +0000 Date: Wed, 11 Mar 2020 10:35:26 -0700 From: Roman Gushchin To: Vlastimil Babka CC: Rik van Riel , Andrew Morton , , , , Qian Cai , Mel Gorman , Anshuman Khandual , Joonsoo Kim Subject: Re: [PATCH] mm,page_alloc,cma: conditionally prefer cma pageblocks for movable allocations Message-ID: <20200311173526.GH96999@carbon.dhcp.thefacebook.com> References: <20200306150102.3e77354b@imladris.surriel.com> <8e67d88f-3ec8-4795-35dc-47e3735e530e@suse.cz> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <8e67d88f-3ec8-4795-35dc-47e3735e530e@suse.cz> X-ClientProxiedBy: MWHPR2201CA0055.namprd22.prod.outlook.com (2603:10b6:301:16::29) To MWHPR15MB1661.namprd15.prod.outlook.com (2603:10b6:300:124::23) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from carbon.dhcp.thefacebook.com (2620:10d:c090:400::5:820) by MWHPR2201CA0055.namprd22.prod.outlook.com (2603:10b6:301:16::29) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.2793.17 via Frontend Transport; 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X-Microsoft-Antispam-Message-Info: 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 X-MS-Exchange-AntiSpam-MessageData: FheSwvJzupDjCehpEpo8sGcfMAff64jQG+5zK8vSfWXZr/rRfgqHeGzkKQlukOvSjJUc8dpof1PnBgF0xEvLwMlpkF1hOyuJwjhRERBp5eHk6vi0//FH3llGJt+aY7v44zreiEoFYpVDfPnu4oREjQhzzP7NjKP/64ko76JOzKfChGz0jI9XCjU3foPsBih7 X-MS-Exchange-CrossTenant-Network-Message-Id: f4812235-a36d-4ec0-0baf-08d7c5e2983c X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Mar 2020 17:35:30.7455 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 8ae927fe-1255-47a7-a2af-5f3a069daaa2 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: rw0A8RFNMTYyv+1423o/l8TnnhTcYx1BEEUkvSgBcsnF9fsDZUyPzH/C+0bro1PZ X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR15MB1359 X-OriginatorOrg: fb.com X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-03-11_07:2020-03-11,2020-03-11 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 spamscore=0 clxscore=1011 bulkscore=0 mlxlogscore=853 mlxscore=0 phishscore=0 malwarescore=0 lowpriorityscore=0 adultscore=0 suspectscore=1 impostorscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2001150001 definitions=main-2003110102 X-FB-Internal: deliver 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 Wed, Mar 11, 2020 at 09:51:07AM +0100, Vlastimil Babka wrote: > On 3/6/20 9:01 PM, Rik van Riel wrote: > > Posting this one for Roman so I can deal with any upstream feedback and > > create a v2 if needed, while scratching my head over the next piece of > > this puzzle :) > > > > ---8<--- > > > > From: Roman Gushchin > > > > Currently a cma area is barely used by the page allocator because > > it's used only as a fallback from movable, however kswapd tries > > hard to make sure that the fallback path isn't used. > > Few years ago Joonsoo wanted to fix these kinds of weird MIGRATE_CMA corner > cases by using ZONE_MOVABLE instead [1]. Unfortunately it was reverted due to > unresolved bugs. Perhaps the idea could be resurrected now? Hi Vlastimil! Thank you for this reminder! I actually looked at it and also asked Joonsoo in private about the state of this patch(set). As I understand, Joonsoo plans to resubmit it later this year. What Rik and I are suggesting seems to be much simpler, however it's perfectly possible that Joonsoo's solution is preferable long-term. So if the proposed patch looks ok for now, I'd suggest to go with it and return to this question once we'll have a new version of ZONE_MOVABLE solution. Thanks!