Received: by 2002:a25:8b91:0:0:0:0:0 with SMTP id j17csp599184ybl; Wed, 4 Dec 2019 07:53:21 -0800 (PST) X-Google-Smtp-Source: APXvYqw5x1FIZ6SZAEHEurRBcTogpYfsgD8hw4tMk3F/u1MaCGduyrWcjZw4JpMTNeSuUwmuwl+u X-Received: by 2002:aca:4e87:: with SMTP id c129mr3043278oib.153.1575474801503; Wed, 04 Dec 2019 07:53:21 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1575474801; cv=none; d=google.com; s=arc-20160816; b=j8Z4yuXrWx41kL5z+5IJeS+1CySz1QnvXCJ6nlGWlAbO7s5b1R3u8UrJF0MH/W+9St 33tD3/KS/i5Fmtfj2LiG2l3M61dB7yL5Rd4auAz6N5H81WoMV3B5MXg4DB/P4EHuPU8w 8CeOEx7rS4bWh42d8viI9xzAGvEoeCD+CTUd1/TkNV9S1JAOzgvJI+55g7YYHvUuoKhK vqA+TFfY2caVgvB/NwTHt+hOjN8KaI10N1Ezyh7p+SPD9fVrAUVcCpx1RwCa0LRpW86C T8cN3Nx5kKnJS45LBNxefFogn4NCe3d5bkZx/1ZN3QbQ2IQNX+iDlxeiPDXnhJxHmy/m Qdmg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:user-agent:references :message-id:in-reply-to:subject:cc:to:from:date; bh=Q2y9sTgNSlMy9UULXsasR841F1elAGR6b4/WHw1qbJs=; b=m8mHgwWvUXrNGFpNlsrdmPJNW4zi6dEK0Ymf0RfHh3EMSTVZ7I217yR7wGw2vkBUSp h3yLMHLyKEbCrtYsnxi1abSGkPpPyWkRaktQC5GRzEDVFCR2Xmx5y6p7SZtoVEWWPgi0 v7Ty5S2PDTZcAAP0VWj/DuWRs8kNyYWu4sIwOvLVjHStvs8xw6HJpy5f4NvspOHSQDWY UqqUB6Y48CUdDITpaNmXvhK2pA1G42dllr7qo6flJv3sFyUC2vNymUtxPEinwbp2mxT+ Imohm8u3UQJk8TgB2Y6vXvlz/nXSr62DjgO5MauvUZtg9jfoGA4KQbf6sov6xgPtNFFk YRiA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 7si2855125otk.79.2019.12.04.07.53.08; Wed, 04 Dec 2019 07:53:21 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728316AbfLDPZo (ORCPT + 99 others); Wed, 4 Dec 2019 10:25:44 -0500 Received: from gentwo.org ([3.19.106.255]:46968 "EHLO gentwo.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727828AbfLDPZn (ORCPT ); Wed, 4 Dec 2019 10:25:43 -0500 Received: by gentwo.org (Postfix, from userid 1002) id 1134D3EED9; Wed, 4 Dec 2019 15:25:43 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by gentwo.org (Postfix) with ESMTP id 0FDC23EBB9; Wed, 4 Dec 2019 15:25:43 +0000 (UTC) Date: Wed, 4 Dec 2019 15:25:43 +0000 (UTC) From: Christopher Lameter X-X-Sender: cl@www.lameter.com To: Michal Hocko cc: LKML , linux-mm@kvack.org Subject: Re: SLUB: purpose of sysfs events on cache creation/removal In-Reply-To: <20191204132812.GF25242@dhcp22.suse.cz> Message-ID: References: <20191126121901.GE20912@dhcp22.suse.cz> <20191126165420.GL20912@dhcp22.suse.cz> <20191127162400.GT20912@dhcp22.suse.cz> <20191127174317.GD26807@dhcp22.suse.cz> <20191204132812.GF25242@dhcp22.suse.cz> 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 Wed, 4 Dec 2019, Michal Hocko wrote: > > > 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. Drop the events. These are internal kernel structures and supporting notifiers to userspace is a bit unusual.