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 C7B0FC43215 for ; Tue, 26 Nov 2019 12:19:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 90595207DD for ; Tue, 26 Nov 2019 12:19:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1574770745; bh=OgsFd4sy4v6UpdihzAdNnw4tUbwpCdwMdmstE3vjEUI=; h=Date:From:To:Cc:Subject:List-ID:From; b=ntX4nWLO5D41MraDczv5a00Ma3fMLdK9qw+/XUYB674KovPN74/kMxkal4xBAbKHb 180MSdWzgTIru7lSwm9RpWeoIzbyLQ4L3SWm62iU+dB65kUYdR/ccVykLP4P2OWLks EZUMyXZQnNPaLO+Qcngux8q8YE87ryjLfj7iiYNE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728301AbfKZMTE (ORCPT ); Tue, 26 Nov 2019 07:19:04 -0500 Received: from mail-wm1-f46.google.com ([209.85.128.46]:52792 "EHLO mail-wm1-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727615AbfKZMTE (ORCPT ); Tue, 26 Nov 2019 07:19:04 -0500 Received: by mail-wm1-f46.google.com with SMTP id l1so2980775wme.2 for ; Tue, 26 Nov 2019 04:19:03 -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:mime-version :content-disposition:user-agent; bh=7FMoRj/ytJrUR66B8EfiOg4Y0/kxvjsVOapeN7HOSP0=; b=p4To6L/uUB4Ynfx7xv9qYg7QuplT6BywCInGbTvO70p7KOEHOF7T4FECjv05a/l7EA pCjPMiBaFxR4pe+3hRAvs3KwYMZhkhq/NhVPTd5Nr/BVauiSiKH2m++0/jH65PvXmWOT ILSo5VBDmduw14z8IvMPXgw20oTeQV7NttmjsCsdylkKNSbrWersAkLvbVyRrQlsoDPB IXq0EymWCaphhE/9nrJ7OiBFEtp/a29Oks1li4Q/T63kuH6rYsjR/6+PIa1MIemoDBSG sLPUgG9OS2BNT+8di8HFdZALDyJathMBjtFV9ZKiHJtO9qiHdB4dDwi8JLFv0oeeFS1E H9VA== X-Gm-Message-State: APjAAAUjDPPf+UVuByThSUzaIhharhuApPTBKF8NuxcCp3fHMoTYOlH6 ArSDvEYtN1C7LA2Hs8kTfkOsC3zO X-Google-Smtp-Source: APXvYqxrUOL9z2BdQOQxB0IBtlt/5B6vcbAXvaMuNfOtiZR8bhwJK4TpfNTavnKN5FLTbsYbr+2Wuw== X-Received: by 2002:a7b:c006:: with SMTP id c6mr4186483wmb.52.1574770742789; Tue, 26 Nov 2019 04:19:02 -0800 (PST) Received: from localhost (prg-ext-pat.suse.com. [213.151.95.130]) by smtp.gmail.com with ESMTPSA id k18sm14941263wrm.82.2019.11.26.04.19.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 26 Nov 2019 04:19:02 -0800 (PST) Date: Tue, 26 Nov 2019 13:19:01 +0100 From: Michal Hocko To: Cristopher Lameter Cc: LKML , linux-mm@kvack.org Subject: SLUB: purpose of sysfs events on cache creation/removal Message-ID: <20191126121901.GE20912@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline 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 Hi, I have just learnt about KOBJ_{ADD,REMOVE} sysfs events triggered on kmem cache creation/removal when SLUB is configured. This functionality goes all the way down to initial SLUB merge. I do not see any references in the Documentation explaining what those events are used for and whether there are any real users. Could you shed some more light into this? -- Michal Hocko SUSE Labs