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 2FCFDC2BD09 for ; Wed, 4 Dec 2019 13:28:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 06E3920803 for ; Wed, 4 Dec 2019 13:28:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575466098; bh=ABbuF9Ja1XTvgy9sKK5WrZynfbuZKtQHLjV0toF4fIY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=VuKOT0NUwYsORpWuYwbVJUXwBC2ImUmkF7vJPw4lWBPv+CaZjj9MwDMjPPW3tJJyM wbVkCOvYC+SUue8H0jQaQjPkjrr5ZvF5mp101aHOT5qSDsAD1Wmb8zypAycje9/o7k vbCvXITtFmt7v8dyfyoTTOSzvms0OmezfJMugpXw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727906AbfLDN2Q (ORCPT ); Wed, 4 Dec 2019 08:28:16 -0500 Received: from mail-wr1-f68.google.com ([209.85.221.68]:41067 "EHLO mail-wr1-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727530AbfLDN2Q (ORCPT ); Wed, 4 Dec 2019 08:28:16 -0500 Received: by mail-wr1-f68.google.com with SMTP id c9so2173099wrw.8 for ; Wed, 04 Dec 2019 05:28:15 -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=+umYpmj3RQMgtbzhJoN9gGSxfzKMbRv2glQbXHfZy4o=; b=QsLiCxnFnJwvaDEX+CeDvWnolklsqh9sztKp3uWya1PI5ON5Ums8XyYTq4S9kR30A8 HbdZHL7+6GRKj/JJkdnIIt1YUyjwvj/mrJVgZo8ayajgyPAtjqWoVQT/WLHNKnW66DpV +z4XSuCZiF6Jr0xvCs+KcFrxWAqk9EY5u1IGWoq7xMqXlpFjIoFKXMKWVr22C0THKR3U Y34oTWLvkZmQDoozHdnU5Sgf+5YapF61D88RXqzV9PtzIhEnM2ErnnAcRguBHlm1pXbt Ddv5tepOUFoKb15NbPzlDvp0v0kyXhR8tRSxnFL1Oc1HCXDB1R0ShvkVlQwvaOj7jBF6 2DBg== X-Gm-Message-State: APjAAAXRAfQQ9uk+crH8ORYih4aKPEG2/dx0pBFzzoVDJMcsUD2ZFSZN 8wSkwrCh81Iw/LOoW3IOpS9eQ2YnO08= X-Google-Smtp-Source: APXvYqwBQ4xYTm6PxE2YxFS/RKJtRVFg1psBTqCj/aLhBIfASHzQOS5JBH1XqkdNtWXLUIAQQDvigg== X-Received: by 2002:a5d:6144:: with SMTP id y4mr4119206wrt.367.1575466094463; Wed, 04 Dec 2019 05:28:14 -0800 (PST) Received: from localhost (prg-ext-pat.suse.com. [213.151.95.130]) by smtp.gmail.com with ESMTPSA id c1sm6273706wmk.22.2019.12.04.05.28.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Dec 2019 05:28:12 -0800 (PST) Date: Wed, 4 Dec 2019 14:28:12 +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: <20191204132812.GF25242@dhcp22.suse.cz> References: <20191126121901.GE20912@dhcp22.suse.cz> <20191126165420.GL20912@dhcp22.suse.cz> <20191127162400.GT20912@dhcp22.suse.cz> <20191127174317.GD26807@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191127174317.GD26807@dhcp22.suse.cz> 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 18:43:17, Michal Hocko wrote: > 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. It would be great to land with some decision here. -- Michal Hocko SUSE Labs