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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 A4E63C432C0 for ; Wed, 27 Nov 2019 17:43:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7476F2071E for ; Wed, 27 Nov 2019 17:43:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574876603; bh=7n/KZtpRiTjohP5m286k/mZdMpMe7XcqDJHWTGhntVM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=A1NaqSt4BxgEvexzbQaZ2FxUS0hB/J6Dx/bKe0VhSq1JYiuCkiUvkL7YPetjzjOUJ 2QgPzNd60GbvxNPkvO9q6jn4ww3igxmCEVYKkyID6c888JLXgByB5mGo3yNe60P6Ct O5KF/PeTPu4wJex1Zo+qjceZvJ6dMkgfsNuKfxOo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727125AbfK0RnW (ORCPT ); Wed, 27 Nov 2019 12:43:22 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:38986 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726576AbfK0RnW (ORCPT ); Wed, 27 Nov 2019 12:43:22 -0500 Received: by mail-wm1-f67.google.com with SMTP id s14so1747621wmh.4 for ; Wed, 27 Nov 2019 09:43:20 -0800 (PST) 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:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=tSJWGvRdO6CDjk2KxjQwZuJhy9Tg5L6rOZn+ujJ/7s0=; b=l4ZR4/lOUOzCy29UwPOA06UEFV973rxG09u2lhxTDl+bw7hnEVYd5zBF4A9ZpVBs29 wmSGq5HslF3i/f2mMQ7pKNO+vCx7sS9zs4tVHEtmiAZkziA4oPm6eeIi91WMk99gaJkb qHmxyn7bgl6BqkbCpWc+KQneW2ADRO/vtEA4UAiY8dZMqMakYckH5+EZVHlJ+eOPsus/ O6Ier0v0xZP4xZnif4S2PmGbtE3ANoYmJQ5p/HG+xASIBRoQj2d6nxEJFXKkTuiJAhCb q9Z5+SfQhMBkoBTl8Sz7P983yYXiLc0vCT6ocNO44qhXCYiOomCN2fEmtPQJotSvUZ7c alAA== X-Gm-Message-State: APjAAAUmMGMBzN6gPBfvcTc9SDqd9F7WRaO1WyIAeQ+LwX16RKfrqK/7 tuW9s2jl8a4430PB7v+1tLLF1aS0 X-Google-Smtp-Source: APXvYqzv9kcJZil504sQkm/RB2JOZoRsmDokWfG9DlfgoAOwM/RjtikAFwIH+MsDscDTE8hWf/AQJA== X-Received: by 2002:a1c:7d01:: with SMTP id y1mr5341026wmc.157.1574876600033; Wed, 27 Nov 2019 09:43:20 -0800 (PST) Received: from localhost (ip-37-188-137-84.eurotel.cz. [37.188.137.84]) by smtp.gmail.com with ESMTPSA id t12sm2235062wrs.96.2019.11.27.09.43.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2019 09:43:19 -0800 (PST) Date: Wed, 27 Nov 2019 18:43:17 +0100 From: Michal Hocko To: Christopher Lameter Cc: LKML , linux-mm@kvack.org Subject: Re: SLUB: purpose of sysfs events on cache creation/removal Message-ID: <20191127174317.GD26807@dhcp22.suse.cz> References: <20191126121901.GE20912@dhcp22.suse.cz> <20191126165420.GL20912@dhcp22.suse.cz> <20191127162400.GT20912@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 27-11-19 16:26:11, Cristopher Lameter wrote: > On Wed, 27 Nov 2019, Michal Hocko wrote: > > > Would you mind a patch that would add a kernel command line parameter > > that would work like memcg_sysfs_enabled? The default for the config > > would be on. Or it would be preferrable to simply drop only events? > > Just drop the events may be best. Then we know if someone is using it. I would be worried that a lack of events might be surprising and a potential userspace wouldn't know that something has changed. -- Michal Hocko SUSE Labs