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=-2.5 required=3.0 tests=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 6EF68C432C0 for ; Tue, 26 Nov 2019 12:19:05 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 358D32075C for ; Tue, 26 Nov 2019 12:19:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 358D32075C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id BF4326B02E5; Tue, 26 Nov 2019 07:19:04 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id BA5596B02E6; Tue, 26 Nov 2019 07:19:04 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ABA7D6B02E7; Tue, 26 Nov 2019 07:19:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0205.hostedemail.com [216.40.44.205]) by kanga.kvack.org (Postfix) with ESMTP id 940146B02E5 for ; Tue, 26 Nov 2019 07:19:04 -0500 (EST) Received: from smtpin12.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 4F6848249980 for ; Tue, 26 Nov 2019 12:19:04 +0000 (UTC) X-FDA: 76198333008.12.chess57_6c4257f5bc748 X-HE-Tag: chess57_6c4257f5bc748 X-Filterd-Recvd-Size: 2491 Received: from mail-wm1-f49.google.com (mail-wm1-f49.google.com [209.85.128.49]) by imf45.hostedemail.com (Postfix) with ESMTP for ; Tue, 26 Nov 2019 12:19:03 +0000 (UTC) Received: by mail-wm1-f49.google.com with SMTP id b11so2956137wmb.5 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=XpmeiTntfQPlf1StOYgERNQ2940HDDZyS1wsXggMOWp7L40jtUFqZFl54iBL6O/yPx /OTUxIBNFx6zzbrnNECeaYaGeO4h92Dgvg0Wr2zCoyEltikTRhqQB2kFK8wjj0/OySNL PCAPHtH++FuwyVOY+yCZO8+g1cLmmFyBD3cKqKsxm14OnwwutHQfhP2Ac56CAvtzDIK+ Z0Qx4WQzmfIQAZWR3O7vkhWkb5QoYsXHZf+RhRpLFF3pAs764UpRkklvdoxqxxTXNDgB nTHh4TB9SAIvR+WVFPxQwIdlP99mDPPMQ7LBr5iVSVHaFzn/1rHN1aUTVDEDIb4m1bGu aqKA== X-Gm-Message-State: APjAAAXgKhJayqrptcBIRwf0fU4k6BaiQynIt8/Qsl4x/Ra8RABfwfz4 6eFNQkZ673kgDcxMslMLkgA= 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) X-Bogosity: Ham, tests=bogofilter, spamicity=0.128296, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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