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=-9.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 D1550C04AB4 for ; Tue, 14 May 2019 13:17:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AE73E20879 for ; Tue, 14 May 2019 13:17:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726407AbfENNRG (ORCPT ); Tue, 14 May 2019 09:17:06 -0400 Received: from mail-wr1-f65.google.com ([209.85.221.65]:42539 "EHLO mail-wr1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726348AbfENNRE (ORCPT ); Tue, 14 May 2019 09:17:04 -0400 Received: by mail-wr1-f65.google.com with SMTP id l2so19167914wrb.9 for ; Tue, 14 May 2019 06:17:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=4NHszGXSdUYSHK5uiVaOzd/y+HHMtNL3fJ2rPoCVo3g=; b=VZocPOVESSDEPvFL0dJL+elMQ2Nb5SYlsD4nuQip05q+rekdjt1P9QmQXwQr4020y1 rfSH/h0zxy11PaBkABxFwEI2S0tHoizmzY/7jXWp9kh39cp01loi74dEMVWnzlpZBiSa RcCxGOF4fXk3Lhg/iPBpELisQXpJCLPSodBu8kDIV9JPw1Lx7iyZoTRtahYMrJ1dTI9y gx2MDKC+qGVAdAJcwQg+metyZZsuZuBastHWAxF9GtBIb3ehS7uWqY9tdlIOgEQwaV6G ZYBfluvCcTFV+6ZOZpuE18DHRciPN5ypgRtqKOjPmzVOUTiw6QBRmB986D2+C5oVvTPv +Vuw== X-Gm-Message-State: APjAAAU74qt6YA8KNWXV/DjOAfFT7E3z7uEXs+mnwJXbz7C3u/mC0Km5 QDQoZTuEtzg+kGQgSByZLK/wQ75c3ZDMrA== X-Google-Smtp-Source: APXvYqz90MXu1Y+IegMsTYBwvQ7q04E4Nwy8CUaUfOYUksdQNjQvegVE/S1PVrMeC+cUogaaT3sQLA== X-Received: by 2002:adf:cd0d:: with SMTP id w13mr21219109wrm.38.1557839822566; Tue, 14 May 2019 06:17:02 -0700 (PDT) Received: from localhost (nat-pool-brq-t.redhat.com. [213.175.37.10]) by smtp.gmail.com with ESMTPSA id o4sm3420247wmc.38.2019.05.14.06.17.01 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 14 May 2019 06:17:01 -0700 (PDT) From: Oleksandr Natalenko To: linux-kernel@vger.kernel.org Cc: Kirill Tkhai , Vlastimil Babka , Michal Hocko , Matthew Wilcox , Pavel Tatashin , Timofey Titovets , Aaron Tomlin , Grzegorz Halat , linux-mm@kvack.org Subject: [PATCH RFC v2 4/4] mm/ksm: add force merging/unmerging documentation Date: Tue, 14 May 2019 15:16:54 +0200 Message-Id: <20190514131654.25463-5-oleksandr@redhat.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190514131654.25463-1-oleksandr@redhat.com> References: <20190514131654.25463-1-oleksandr@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Document respective sysfs knob. Signed-off-by: Oleksandr Natalenko --- Documentation/admin-guide/mm/ksm.rst | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/Documentation/admin-guide/mm/ksm.rst b/Documentation/admin-guide/mm/ksm.rst index 9303786632d1..4302b92910ec 100644 --- a/Documentation/admin-guide/mm/ksm.rst +++ b/Documentation/admin-guide/mm/ksm.rst @@ -78,6 +78,17 @@ KSM daemon sysfs interface The KSM daemon is controlled by sysfs files in ``/sys/kernel/mm/ksm/``, readable by all but writable only by root: +force_madvise + write-only control to force merging/unmerging for specific + task. + + To mark the VMAs as mergeable, use: + ``echo PID > /sys/kernel/mm/ksm/force_madvise`` + + To unmerge all the VMAs, use: + ``echo -PID > /sys/kernel/mm/ksm/force_madvise`` + (note the prepending "minus") + pages_to_scan how many pages to scan before ksmd goes to sleep e.g. ``echo 100 > /sys/kernel/mm/ksm/pages_to_scan``. -- 2.21.0