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=-2.4 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,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 3C223CA9EC0 for ; Mon, 28 Oct 2019 12:55:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E839220873 for ; Mon, 28 Oct 2019 12:55:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=yandex-team.ru header.i=@yandex-team.ru header.b="vBo73IPU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E839220873 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=yandex-team.ru Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 987676B0007; Mon, 28 Oct 2019 08:55:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 939446B0008; Mon, 28 Oct 2019 08:55:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8265D6B000A; Mon, 28 Oct 2019 08:55:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0126.hostedemail.com [216.40.44.126]) by kanga.kvack.org (Postfix) with ESMTP id 652306B0007 for ; Mon, 28 Oct 2019 08:55:25 -0400 (EDT) Received: from smtpin20.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id DD136824999B for ; Mon, 28 Oct 2019 12:55:24 +0000 (UTC) X-FDA: 76093189368.20.pin70_2f2153a3eae1d X-HE-Tag: pin70_2f2153a3eae1d X-Filterd-Recvd-Size: 3018 Received: from forwardcorp1o.mail.yandex.net (forwardcorp1o.mail.yandex.net [95.108.205.193]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Mon, 28 Oct 2019 12:55:23 +0000 (UTC) Received: from mxbackcorp1g.mail.yandex.net (mxbackcorp1g.mail.yandex.net [IPv6:2a02:6b8:0:1402::301]) by forwardcorp1o.mail.yandex.net (Yandex) with ESMTP id 71BB12E09CF; Mon, 28 Oct 2019 15:55:21 +0300 (MSK) Received: from iva4-c987840161f8.qloud-c.yandex.net (iva4-c987840161f8.qloud-c.yandex.net [2a02:6b8:c0c:3da5:0:640:c987:8401]) by mxbackcorp1g.mail.yandex.net (nwsmtp/Yandex) with ESMTP id 6aykFKr5ke-tJBSrcoG; Mon, 28 Oct 2019 15:55:21 +0300 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=yandex-team.ru; s=default; t=1572267321; bh=8ZYFRTzWqu504O6KQ7FUcpox3cZWhyoBz5ojDPWSmYE=; h=In-Reply-To:Message-ID:From:Date:References:To:Subject:Cc; b=vBo73IPUe3lrjMad2DFnaYStzbQtHX6+YDN8Zspbs17A3PUhAE2CpNckQRNrj+NQH Fc/ykjTuHoaEP25SzA0GilwBqxkYuDk/Vog1pEEZ+1V9GKWmEN/wj1TMj63mquBT+n 9bq3FElt7uiVv3dj0zaldvpCQ2e4tNqLPw32lFcQ= Authentication-Results: mxbackcorp1g.mail.yandex.net; dkim=pass header.i=@yandex-team.ru Received: from dynamic-red.dhcp.yndx.net (dynamic-red.dhcp.yndx.net [2a02:6b8:0:40c:148a:8f3:5b61:9f4]) by iva4-c987840161f8.qloud-c.yandex.net (nwsmtp/Yandex) with ESMTPSA id HgRUn4uEtY-tJWiB8BI; Mon, 28 Oct 2019 15:55:19 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) Subject: Re: [PATCH RFC] fs/fcntl: add fcntl F_GET_RSS To: Florian Weimer Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org, Michal Hocko , Alexander Viro , Johannes Weiner , Andrew Morton , Linus Torvalds , Roman Gushchin References: <157225848971.557.16257813537984792761.stgit@buzz> <87k18p6qjk.fsf@mid.deneb.enyo.de> From: Konstantin Khlebnikov Message-ID: Date: Mon, 28 Oct 2019 15:55:19 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: <87k18p6qjk.fsf@mid.deneb.enyo.de> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-CA Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 28/10/2019 14.46, Florian Weimer wrote: > * Konstantin Khlebnikov: > >> This implements fcntl() for getting amount of resident memory in cache. >> Kernel already maintains counter for each inode, this patch just exposes >> it into userspace. Returned size is in kilobytes like values in procfs. > > I think this needs a 32-bit compat implementation which clamps the > returned value to INT_MAX. > 32-bit machine couldn't hold more than 2TB cache in one file. Even radix tree wouldn't fit into low memory area.