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 C4E58C433F5 for ; Tue, 24 May 2022 10:47:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 288B18D0003; Tue, 24 May 2022 06:47:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 238948D0002; Tue, 24 May 2022 06:47:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 14A648D0003; Tue, 24 May 2022 06:47:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 05B0E8D0002 for ; Tue, 24 May 2022 06:47:32 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id CD3EF21077 for ; Tue, 24 May 2022 10:47:31 +0000 (UTC) X-FDA: 79500310302.16.69012B2 Received: from smtp-out2.suse.de (smtp-out2.suse.de [195.135.220.29]) by imf29.hostedemail.com (Postfix) with ESMTP id 9FADE12002B for ; Tue, 24 May 2022 10:47:20 +0000 (UTC) Received: from relay2.suse.de (relay2.suse.de [149.44.160.134]) by smtp-out2.suse.de (Postfix) with ESMTP id A43C61F8B8; Tue, 24 May 2022 10:47:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1653389249; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=a/JkmIrb3U0V/yu8PhyV+N8XrbjKAUo7AoBVKzx+G8o=; b=Rb3brHeSayt8ozGawjFpwJcpvr999BpR3pDQSkTLuEcz3hN1uVvTRiwpyoqnj5WBbqdbfP /TQRnq2orPaNUKVKgZnKJ3ryV4w0E7kHBeTVB+jZF4GkIEu7LsnZuQ7uoEYsdoPSKyWcFL gpRbufrymhC1QhjhY7nO7Vta82G2XVw= Received: from suse.cz (unknown [10.100.201.86]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by relay2.suse.de (Postfix) with ESMTPS id 360582C141; Tue, 24 May 2022 10:47:28 +0000 (UTC) Date: Tue, 24 May 2022 12:47:28 +0200 From: Michal Hocko To: hezhongkun Cc: hannes@cmpxchg.org, roman.gushchin@linux.dev, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, lizefan.x@bytedance.com Subject: Re: [PATCH] mm: memcontrol: add the mempolicy interface for cgroup v2. Message-ID: References: <20220524103638.473-1-hezhongkun.hzk@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220524103638.473-1-hezhongkun.hzk@bytedance.com> X-Stat-Signature: fkb1t3trq99c6yio98bn5hbk4cjha1qh X-Rspam-User: Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=suse.com header.s=susede1 header.b=Rb3brHeS; dmarc=pass (policy=quarantine) header.from=suse.com; spf=pass (imf29.hostedemail.com: domain of mhocko@suse.com designates 195.135.220.29 as permitted sender) smtp.mailfrom=mhocko@suse.com X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 9FADE12002B X-HE-Tag: 1653389240-538976 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 Tue 24-05-22 18:36:38, hezhongkun wrote: > From: Hezhongkun > > Mempolicy is difficult to use because it is set in-process > via a system call. We want to make it easier to use mempolicy > in cgroups, so that we can control low-priority cgroups to > allocate memory in specified nodes. So this patch want to > adds the mempolicy interface. > > the mempolicy priority of memcgroup is higher than the priority > of task. The order of getting the policy is, > memcgroup->policy,task->policy or vma policy, default policy. > memcgroup's policy is owned by itself, so descendants will > not inherit it. Why cannot you use cpuset cgroup? -- Michal Hocko SUSE Labs