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 61205C19F2D for ; Thu, 11 Aug 2022 08:21:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F0A038E0003; Thu, 11 Aug 2022 04:21:36 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EB8E88E0001; Thu, 11 Aug 2022 04:21:36 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DA7D58E0003; Thu, 11 Aug 2022 04:21:36 -0400 (EDT) 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 C88198E0001 for ; Thu, 11 Aug 2022 04:21:36 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 93903160778 for ; Thu, 11 Aug 2022 08:21:36 +0000 (UTC) X-FDA: 79786617792.20.D82C834 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf12.hostedemail.com (Postfix) with ESMTP id E010C40024 for ; Thu, 11 Aug 2022 08:21:35 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id D889F68AA6; Thu, 11 Aug 2022 10:21:32 +0200 (CEST) Date: Thu, 11 Aug 2022 10:21:32 +0200 From: Christoph Hellwig To: Michal Hocko Cc: Christoph Hellwig , Andrew Morton , Baoquan He , John Donnelly , David Hildenbrand , linux-mm@kvack.org, LKML Subject: Re: [PATCH] dma/pool: do not complain if DMA pool is not allocated Message-ID: <20220811082132.GA17685@lst.de> References: <20220325122559.14251-1-mhocko@kernel.org> <20220325164856.GA16800@lst.de> <20220811072817.GB13886@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=none; dmarc=none; spf=none (imf12.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1660206096; a=rsa-sha256; cv=none; b=Vb6ewzAA+kCw5wu49evyPLniN2gxrYgMCgDFkSCHrj+BWfxYh871VFfJGuyK6GYp02qHtb TCi+JFc6ZbYQx6asE4pQau6D2DL2Enooxk6nIEmSLPHe+5U87tj8co8x1FTII3SOB0kpAt USrKZgSWHTQ9/JAL0YGFQ2w7PPW5uIo= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1660206096; 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; bh=+++mWKs+PRosioxhX1JiVw/0p9nAGmUvp4UMAb3hcL8=; b=L+Z+TVxKII5owVY/RVLP0sX/17nY8vSGzUAskEad0jpCHXC0G21EZCboaroEXvQCXjnpiN DpQkfyV0FwN1454STO76zj9o0EKpfUnRn1pWS1iQXgbBqdCDa/mXM+0J7ki2vcirddamlz RjuwpfFxhbOXL/oNI4tpFx0wICdVgLI= X-Rspam-User: Authentication-Results: imf12.hostedemail.com; dkim=none; dmarc=none; spf=none (imf12.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de X-Stat-Signature: ntbdirwkyo6m91hw7xbmrx4tsjqw3u3z X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: E010C40024 X-HE-Tag: 1660206095-864580 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 Thu, Aug 11, 2022 at 10:20:43AM +0200, Michal Hocko wrote: > Meminfo part says > Node 0 DMA free:160kB boost:0kB min:0kB low:0kB high:0kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15996kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB > > So the zone has 15MB of managed memory (by the page allocator), yet only > 160kB is free early boot during the allocation. So it is mostly consumed > by somebody. I haven't really checked by whom. > > Does that exaplain the above better? Yes. I'm really curious who eats up all the GFP_DMA memory early during boot, though.