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=-0.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 0D43DC10F25 for ; Sun, 8 Mar 2020 01:58:16 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id B73812070A for ; Sun, 8 Mar 2020 01:58:15 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="h9XGTl4A" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B73812070A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 4A7E96B0005; Sat, 7 Mar 2020 20:58:15 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 459E66B0006; Sat, 7 Mar 2020 20:58:15 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 36EB76B0007; Sat, 7 Mar 2020 20:58:15 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0019.hostedemail.com [216.40.44.19]) by kanga.kvack.org (Postfix) with ESMTP id 1C8F96B0005 for ; Sat, 7 Mar 2020 20:58:15 -0500 (EST) Received: from smtpin19.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id A2F5E181AC9CB for ; Sun, 8 Mar 2020 01:58:14 +0000 (UTC) X-FDA: 76570534908.19.glue00_650ae63da3009 X-HE-Tag: glue00_650ae63da3009 X-Filterd-Recvd-Size: 2457 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf12.hostedemail.com (Postfix) with ESMTP for ; Sun, 8 Mar 2020 01:58:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; 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=sC8gQrUqvjk77AMEkpgTPlQtp+KRWQyDZNoS30Hnuno=; b=h9XGTl4A3PG2USDSzqk1jmV9hw S3dWv/eoWLIN3LQSmbb185J+RQb0Xz1LALe6+x6V4QijpKN9mQnZiCjZac4rYimd9Di/8EBsp3s4j 7D2DOjVI8/ceKBMQ1iFpa+QIliMDGYoEtOjainCuR3QbIKVqkDvsc9KiGXnQFrdTQostIR/BIUTgl Hua+b97LbJMvs7gpeZ3b5IgsfzDI+glTb978QRxgeN479eIhiqp6jdmZ3vEmpdky0bTQqN6ecypL9 m+pljgV89DJUneUJHAgEXntsMzihisOGdesAzSZ3PXIHAj8g9XCqysz0N8Q/Agb/lMizY/5hBXqlN jZk7Kc3A==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jAlCc-0007Ik-NO; Sun, 08 Mar 2020 01:58:02 +0000 Date: Sat, 7 Mar 2020 17:58:02 -0800 From: Matthew Wilcox To: Andrew Morton Cc: Jaewon Kim , walken@google.com, bp@suse.de, linux-mm@kvack.org, linux-kernel@vger.kernel.org, jaewon31.kim@gmail.com Subject: Re: [PATCH] mm: mmap: show vm_unmapped_area error log Message-ID: <20200308015802.GD31215@bombadil.infradead.org> References: <20200304030206.1706-1-jaewon31.kim@samsung.com> <5E605749.9050509@samsung.com> <20200305202443.8de3598558336b1d75afbba7@linux-foundation.org> <5E61EAB6.5080609@samsung.com> <20200307154744.acd523831b45efa8d0fc1dfa@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200307154744.acd523831b45efa8d0fc1dfa@linux-foundation.org> 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 Sat, Mar 07, 2020 at 03:47:44PM -0800, Andrew Morton wrote: > On Fri, 6 Mar 2020 15:16:22 +0900 Jaewon Kim wrote: > > Even on 64 bit kernel, the mmap failure can happen for a 32 bit task. > > Virtual memory space shortage of a task on mmap is reported to userspace > > as -ENOMEM. It can be confused as physical memory shortage of overall > > system. But userspace can trigger this printk. We don't usually allow printks under those circumstances, even ratelimited.