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 1249AC3F2D1 for ; Sun, 8 Mar 2020 01:58:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D00F22075A 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" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726292AbgCHB6O (ORCPT ); Sat, 7 Mar 2020 20:58:14 -0500 Received: from bombadil.infradead.org ([198.137.202.133]:33952 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726266AbgCHB6O (ORCPT ); Sat, 7 Mar 2020 20:58:14 -0500 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> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.