From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id A816ECA9EA0 for ; Tue, 22 Oct 2019 07:49:04 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 66ED520B7C for ; Tue, 22 Oct 2019 07:49:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 66ED520B7C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.cz Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 02F5F6B0006; Tue, 22 Oct 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test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id D2C1FB5A1; Tue, 22 Oct 2019 07:49:00 +0000 (UTC) Subject: Re: lot of MemAvailable but falling cache and raising PSI To: Stefan Priebe - Profihost AG , Michal Hocko Cc: "linux-mm@kvack.org" , l.roehrs@profihost.ag, cgroups@vger.kernel.org, Johannes Weiner References: <52235eda-ffe2-721c-7ad7-575048e2d29d@profihost.ag> <20190910082919.GL2063@dhcp22.suse.cz> <132e1fd0-c392-c158-8f3a-20e340e542f0@profihost.ag> <20190910090241.GM2063@dhcp22.suse.cz> <743a047e-a46f-32fa-1fe4-a9bd8f09ed87@profihost.ag> <20190910110741.GR2063@dhcp22.suse.cz> <364d4c2e-9c9a-d8b3-43a8-aa17cccae9c7@profihost.ag> <20190910125756.GB2063@dhcp22.suse.cz> <20190910132418.GC2063@dhcp22.suse.cz> <2fe81a9e-5d29-79cf-f747-c66ae35defd0@profihost.ag> <4f6f1bc9-08f4-d53a-8788-a761be769757@suse.cz> <76ad5b29-815b-3d87-cefa-ec5b222279f1@profihost.ag> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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Profihost AG wrote: >> Hi, could you try the patch below? I suspect you're hitting a corner >> case where compaction_suitable() returns COMPACT_SKIPPED for the >> ZONE_DMA, triggering reclaim even if other zones have plenty of free >> memory. And should_continue_reclaim() then returns true until twice the >> requested page size is reclaimed (compact_gap()). That means 4MB >> reclaimed for each THP allocation attempt, which roughly matches the >> trace data you preovided previously. >> >> The amplification to 4MB should be removed in patches merged for 5.4, so >> it would be only 32 pages reclaimed per THP allocation. The patch below >> tries to remove this corner case completely, and it should be more >> visible on your 5.2.x, so please apply it there. >> > is there any reason to not apply that one on top of 4.19? > > Greets, > Stefan > It should work, cherrypicks fine without conflict here.