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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 714BDC433FE for ; Tue, 22 Nov 2022 12:59:23 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EF9098E0001; Tue, 22 Nov 2022 07:59:22 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id EA7456B0075; Tue, 22 Nov 2022 07:59:22 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D95EC8E0001; Tue, 22 Nov 2022 07:59:22 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id CD3646B0074 for ; Tue, 22 Nov 2022 07:59:22 -0500 (EST) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 7869AA028C for ; Tue, 22 Nov 2022 12:59:22 +0000 (UTC) X-FDA: 80161084164.07.51CC503 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf26.hostedemail.com (Postfix) with ESMTP id 299CA14000C for ; Tue, 22 Nov 2022 12:59:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=i57W19x5PXh8Z3pxQkjTS0ujZiYLHbcoZpQUee7crUs=; b=prla3oClXlJySOqAiMwQyq6HbW ri297PC3xL/8GS4SFeW6Y+6QZILiqmuexwlK01g5n021bKE9edQRIFm3R+N/oSAoxnrCRT/DZQYHH tXOUnfXKZrGNcRib0T6J75PIUtSX9RATZK+mTw7mcGNiAp0MSkEcJXgMboLX8BSZe+kkzxqi3qmm/ yl2FD5b7y9SwQCBcn8u5VCabEhSkRorvgZ0wuZ4EuC1M/nsUpmcHC2u9dH4N96JYyjymjcQuFMffq mWTEGvJ86gxPDkhr4bzx+Lga2YxMYaDsR+IO/AuI11bzbDKDnnSfe+JuvhtlyRPEQgzcNPoxwiJ8W ajFxHl7w==; Received: from hch by bombadil.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1oxSrn-009Scv-M7; Tue, 22 Nov 2022 12:59:11 +0000 Date: Tue, 22 Nov 2022 04:59:11 -0800 From: Christoph Hellwig To: "Darrick J. Wong" Cc: Lukas Czerner , Hugh Dickins , Jan Kara , Eric Sandeen , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org Subject: Re: [PATCH v2 1/3] quota: add quota in-memory format support Message-ID: References: <20221121142854.91109-1-lczerner@redhat.com> <20221121142854.91109-2-lczerner@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1669121962; a=rsa-sha256; cv=none; b=LpU+ybRy1l1RiWh+5+FtAwhZM+nepbkI7OPv8JkBsRTB0wjkABxZSzqWWnxX3ZH8fhxfFh XxuLymMjEmTvIo21U2rqHUyXy5p7sMba6RWK4T0rtVzcCFe0qGUXPB+5bxFfA66ZO9kSFc kaP8xHQSlWbQjYBpzRNfd5YYf5IGbN0= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=prla3oCl; dmarc=none; spf=none (imf26.hostedemail.com: domain of BATV+ebc7d116b695001c1e40+7030+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+ebc7d116b695001c1e40+7030+infradead.org+hch@bombadil.srs.infradead.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669121962; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=i57W19x5PXh8Z3pxQkjTS0ujZiYLHbcoZpQUee7crUs=; b=Hgfn3CZvzZzH6Z8OfGpypsXa/qEKnzc7deQJ+pHAXRfzo4/autghjhnjqc5M8NvsCWzcyO lu8WZ88AUdlRwI7KXGwqIyyJGpjbz++ZP4iUbqmttPtK6izmzWoEgI+3dhfjyobyebVf4Q SsVd81zkSodaO4aoCi0xtapOB3adaOk= Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=prla3oCl; dmarc=none; spf=none (imf26.hostedemail.com: domain of BATV+ebc7d116b695001c1e40+7030+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+ebc7d116b695001c1e40+7030+infradead.org+hch@bombadil.srs.infradead.org X-Stat-Signature: 97adyjywgxnead39xfezi4a6nyqw999u X-Rspamd-Queue-Id: 299CA14000C X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1669121961-814046 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 Mon, Nov 21, 2022 at 09:48:18AM -0800, Darrick J. Wong wrote: > Would it be wise to "persist" dquot contents to a (private) tmpfs file > to facilitate incore dquot reclaim? The tmpfs file data can be paged > out, or even punched if all the dquot records in that page go back to > default settings. That seems like a good idea for memory usage, but I think this might also make the code much simpler, as that just requires fairly trivial quota_read and quota_write methods in the shmem code instead of new support for an in-memory quota file.