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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD43BC54E58 for ; Wed, 13 Mar 2024 11:00:15 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1342F80022; Wed, 13 Mar 2024 07:00:15 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0E41B940010; Wed, 13 Mar 2024 07:00:15 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id F163C80022; Wed, 13 Mar 2024 07:00:14 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id E142D940010 for ; Wed, 13 Mar 2024 07:00:14 -0400 (EDT) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 6DAA2A185A for ; Wed, 13 Mar 2024 11:00:14 +0000 (UTC) X-FDA: 81891721548.17.773CA77 Received: from mail78-58.sinamail.sina.com.cn (mail78-58.sinamail.sina.com.cn [219.142.78.58]) by imf22.hostedemail.com (Postfix) with ESMTP id EEE3CC0025 for ; Wed, 13 Mar 2024 11:00:10 +0000 (UTC) Authentication-Results: imf22.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf22.hostedemail.com: domain of hdanton@sina.com designates 219.142.78.58 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1710327612; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vUAyzHAUT/L/3w2veAwM81inKGN1JXUXcLkAWipbJjc=; b=TcklrDlSttab9IwaP5/nO22otFJX29aVqM9mnzmdzWElXUhIPOl7iakfByhPaKbzwCGK9L K1fQk7v1b/OO5hzySTTN0cHkQCWAW+vpu+yaG8OOpy1iyCVslzPAN5n9/uFSYKjgOlbINK fu9LbP8vT0++s1BCOE8WWClNu3zmllY= ARC-Authentication-Results: i=1; imf22.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf22.hostedemail.com: domain of hdanton@sina.com designates 219.142.78.58 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1710327612; a=rsa-sha256; cv=none; b=1S8ecGa+8dJkD7FLPQawaT+Emi9b3a05d7F4c4P8RRK38M7Imb9OqCiLdgnpoPbTy8sFaK QUNZ1RXvRQWZAvLrOCURWtL33vv/Mie3fUeUZ92j92pPM8ewqceSCB4NC/ZS0M6eNTmyBW 6hEcJZaqgkGFxQZKT5rApL0TCx6r/24= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([116.24.9.180]) by sina.com (172.16.235.25) with ESMTP id 65F1873100001394; Wed, 13 Mar 2024 19:00:04 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com X-SMAIL-MID: 16864934210262 X-SMAIL-UIID: 0B8297D186AD46CEB1A98DA75BCB2E4F-20240313-190004-1 From: Hillf Danton To: Johannes Weiner Cc: Yu Zhao , Axel Rasmussen , Chris Down , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: MGLRU premature memcg OOM on slow writes Date: Wed, 13 Mar 2024 18:59:53 +0800 Message-Id: <20240313105953.2234-1-hdanton@sina.com> In-Reply-To: <20240312210822.GB65481@cmpxchg.org> References: <20240229235134.2447718-1-axelrasmussen@google.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: EEE3CC0025 X-Rspam-User: X-Rspamd-Server: rspam02 X-Stat-Signature: i7sunkmfse8nska4ijqwqd83miu5hiek X-HE-Tag: 1710327610-529547 X-HE-Meta: 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 O0ACV2mj /Mhu+4UJW2EBi6F6Ur9M6+4axc0kCD55Ij33OCwcSIT/Xraas6fVU5wcswl/ns4WkeISDnM6ElQ16A18H3IBZ/7NMiyNn+s/SWEqOz96fsgQ8RwfC8HBg6bmp1NvCAiPAQIINejNDuWb5f8uCZjiAfdADyFANLSY740gt2a+dKBST3v8V7QchVsE3CYRrwtdPbZJbIoDN0OrlOYKSHSs2a76pvTLKoq59e9kP 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: List-Subscribe: List-Unsubscribe: On Tue, 12 Mar 2024 17:08:22 -0400 Johannes Weiner > > Back to the broader question though: if reclaim demand outstrips clean > pages and the only viable candidates are dirty ones (e.g. an > allocation spike in the presence of dirty/writeback pages), there only > seem to be 3 options: > > 1) sleep-wait for writeback > 2) continue scanning, aka busy-wait for writeback + age inversions > 3) find nothing and declare OOM 4) make dirty ratio match your writeback bandwidth [1] [1] Subject: Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free https://lore.kernel.org/lkml/CA+55aFzNe=3e=cDig+vEzZS5jm2c6apPV4s5NKG4eYL4_jxQjQ@mail.gmail.com/