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=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, 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 417D7C2BD09 for ; Wed, 4 Dec 2019 15:25:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2095B2084F for ; Wed, 4 Dec 2019 15:25:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728320AbfLDPZo (ORCPT ); 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.