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=-9.9 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1,USER_IN_DEF_DKIM_WL 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 41505C43331 for ; Tue, 24 Mar 2020 19:17:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 15A042074D for ; Tue, 24 Mar 2020 19:17:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="tIMOfdTl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726560AbgCXTRO (ORCPT ); Tue, 24 Mar 2020 15:17:14 -0400 Received: from mail-pl1-f193.google.com ([209.85.214.193]:40110 "EHLO mail-pl1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725835AbgCXTRO (ORCPT ); Tue, 24 Mar 2020 15:17:14 -0400 Received: by mail-pl1-f193.google.com with SMTP id h11so7809065plk.7 for ; Tue, 24 Mar 2020 12:17:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:from:to:cc:subject:in-reply-to:message-id:references :user-agent:mime-version; bh=Rh4HBg/agEMeOOZna2pzZhd8r6lKpuw8m53EKKUPZHc=; b=tIMOfdTlHbbOdLWgQGt6oJeQvoMFtQVTFpy2pLi7nTYBlhcgtjoQBFLNrAmUCFix+T Wp/wocBxPQTXgY7/RgRBxViOlX3qvt4qAYEk/YW1KHupUy3P9tp2KaMOzrX0R6sTFgf6 PliVP2qUb/uLXnzP8BjH8l1c4dAaUAh3rFpjd7ig+b66BRc+pgAFmsMRdIB6fEqjczvQ yQTmo6/rDRuUJ5/DZl7UmqTf1BXpa/ALNbK4+wuduHiTGxYnqbqiVNJ6K3EZFv9wHg8E xLxeTBC5Y9IaRg2G++TFA5LGhvZDI2ZYBb4si3IViJ1w3uXfMxd2yLIR9+XuIcNGFgWl 9f3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:in-reply-to:message-id :references:user-agent:mime-version; bh=Rh4HBg/agEMeOOZna2pzZhd8r6lKpuw8m53EKKUPZHc=; b=kHwvnMUc3Cxy/fNLSgkVWgjq89BfEm8Es9fMSRTDjejuCA3rLpzL+dDbfiIjmZSdRN NAhaakblB+uwZSdYVSfEi6Tn1m4CxhDNbKR04aXh3nbQVUJ7zK/USbnz5m5Q+Z7xKd8P vMcu9+slNcs3hXVgRfIGPcrJRW8ns0YcxjDQdy83R9ww7yiZQlk12nejtTsL1n9wYbJc GbEwBHxnYYZnAFrjynDqypKdmEp7wdLp7VmfDyNNvEJ1rKnRFVWpBbHz1FdQfWzXtGbn HmGDLJhyVRpvucOUhSj66SSfZHpPkDzGEO/y16YUUPHk5+KVGE8h30JXPGQcHdwwz24m Pyyg== X-Gm-Message-State: ANhLgQ2Uj76t3bRgt50hfodSykaNAPtUeMhyOdNuLeIi55dH2ELWZBs+ lfMU6zwLwVxXjddCaU2OvHtdQg== X-Google-Smtp-Source: ADFU+vupg7MB8LHNKMkljbJFFhiE3/MiCNtH+/LIaDpRYt4jhcqCLjd6AEqV1lRYWFM6fJ38Oue/Bw== X-Received: by 2002:a17:902:8ec3:: with SMTP id x3mr22947183plo.137.1585077433211; Tue, 24 Mar 2020 12:17:13 -0700 (PDT) Received: from [2620:15c:17:3:3a5:23a7:5e32:4598] ([2620:15c:17:3:3a5:23a7:5e32:4598]) by smtp.gmail.com with ESMTPSA id k17sm16391918pfp.194.2020.03.24.12.17.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Mar 2020 12:17:12 -0700 (PDT) Date: Tue, 24 Mar 2020 12:17:11 -0700 (PDT) From: David Rientjes X-X-Sender: rientjes@chino.kir.corp.google.com To: "Kirill A. Shutemov" cc: Hui Zhu , hannes@cmpxchg.org, mhocko@kernel.org, vdavydov.dev@gmail.com, akpm@linux-foundation.org, hughd@google.com, yang.shi@linux.alibaba.com, dan.j.williams@intel.com, aneesh.kumar@linux.ibm.com, sean.j.christopherson@intel.com, thellstrom@vmware.com, guro@fb.com, shakeelb@google.com, chris@chrisdown.name, tj@kernel.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Hui Zhu Subject: Re: [PATCH] mm, memcg: Add memory.transparent_hugepage_disabled In-Reply-To: <20200324121758.paxxthsi2f4hngfa@box> Message-ID: References: <1585045916-27339-1-git-send-email-teawater@gmail.com> <20200324121758.paxxthsi2f4hngfa@box> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 24 Mar 2020, Kirill A. Shutemov wrote: > On Tue, Mar 24, 2020 at 06:31:56PM +0800, Hui Zhu wrote: > > /sys/kernel/mm/transparent_hugepage/enabled is the only interface to > > control if the application can use THP in system level. > > No. We have prctl(PR_SET_THP_DISABLE) too. > Yeah, I think this is the key point since this can be inherited across fork and thus you already have the ability to disable thp for a process where you cannot even modify the binary to do MADV_NOHUGEPAGE.