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=-2.5 required=3.0 tests=MAILING_LIST_MULTI,SPF_PASS, USER_AGENT_MUTT autolearn=ham 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 5F79EC0044C for ; Wed, 31 Oct 2018 10:15:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2F48120685 for ; Wed, 31 Oct 2018 10:15:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 2F48120685 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728568AbeJaTMd (ORCPT ); Wed, 31 Oct 2018 15:12:33 -0400 Received: from mx2.suse.de ([195.135.220.15]:50700 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727865AbeJaTMd (ORCPT ); Wed, 31 Oct 2018 15:12:33 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 5F308AE3E; Wed, 31 Oct 2018 10:15:03 +0000 (UTC) Date: Wed, 31 Oct 2018 11:15:01 +0100 From: Michal Hocko To: Miles Chen Cc: Andrew Morton , Joe Perches , Matthew Wilcox , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com Subject: Re: [PATCH v3] mm/page_owner: use kvmalloc instead of kmalloc Message-ID: <20181031101501.GL32673@dhcp22.suse.cz> References: <1540790176-32339-1-git-send-email-miles.chen@mediatek.com> <20181029080708.GA32673@dhcp22.suse.cz> <20181029081706.GC32673@dhcp22.suse.cz> <1540862950.12374.40.camel@mtkswgap22> <20181030060601.GR32673@dhcp22.suse.cz> <1540882551.23278.12.camel@mtkswgap22> <20181030081537.GV32673@dhcp22.suse.cz> <1540975637.10275.10.camel@mtkswgap22> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1540975637.10275.10.camel@mtkswgap22> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 31-10-18 16:47:17, Miles Chen wrote: > On Tue, 2018-10-30 at 09:15 +0100, Michal Hocko wrote: > > On Tue 30-10-18 14:55:51, Miles Chen wrote: > > [...] > > > It's a real problem when using page_owner. > > > I found this issue recently: I'm not able to read page_owner information > > > during a overnight test. (error: read failed: Out of memory). I replace > > > kmalloc() with vmalloc() and it worked well. > > > > Is this with trimming the allocation to a single page and doing shorter > > than requested reads? > > > I printed out the allocate count on my device the request count is <= > 4096. So I tested this scenario by trimming the count to from 4096 to > 1024 bytes and it works fine. > > count = count > 1024? 1024: count; > > It tested it on both 32bit and 64bit kernel. Are you saying that you see OOMs for 4k size? -- Michal Hocko SUSE Labs