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 30EB1C43603 for ; Wed, 4 Dec 2019 15:25:45 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 060CF207DD for ; Wed, 4 Dec 2019 15:25:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 060CF207DD Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 8791A6B0B38; Wed, 4 Dec 2019 10:25:44 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7DB5E6B0B39; Wed, 4 Dec 2019 10:25:44 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6F2146B0B3A; Wed, 4 Dec 2019 10:25:44 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0045.hostedemail.com [216.40.44.45]) by kanga.kvack.org (Postfix) with ESMTP id 564A76B0B38 for ; Wed, 4 Dec 2019 10:25:44 -0500 (EST) Received: from smtpin27.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 207A7824D19F for ; Wed, 4 Dec 2019 15:25:44 +0000 (UTC) X-FDA: 76227833808.27.grade72_14ea8772d0557 X-HE-Tag: grade72_14ea8772d0557 X-Filterd-Recvd-Size: 1754 Received: from gentwo.org (gentwo.org [3.19.106.255]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Wed, 4 Dec 2019 15:25:43 +0000 (UTC) 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.006403, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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.