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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 A2923C43381 for ; Tue, 26 Mar 2019 13:17:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6E89520823 for ; Tue, 26 Mar 2019 13:17:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731579AbfCZNRF (ORCPT ); Tue, 26 Mar 2019 09:17:05 -0400 Received: from mx3.molgen.mpg.de ([141.14.17.11]:53307 "EHLO mx1.molgen.mpg.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726175AbfCZNRE (ORCPT ); Tue, 26 Mar 2019 09:17:04 -0400 Received: from [172.18.205.202] (unknown [46.183.103.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pmenzel) by mx.molgen.mpg.de (Postfix) with ESMTPSA id A0DFE604E3A59; Tue, 26 Mar 2019 14:17:02 +0100 (CET) Subject: Re: Reading `/sys/kernel/debug/kmemleak` takes 3 s and content not shown To: Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <88e651e2-d876-376e-81fa-eab0729ebb47@molgen.mpg.de> From: Paul Menzel Message-ID: <33ad8e80-4275-d5bf-9b6a-052dd8afe7ef@molgen.mpg.de> Date: Tue, 26 Mar 2019 14:17:01 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.5.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: de-DE Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Dear Christophe, On 26.03.19 13:55, Christophe Leroy wrote: > Le 26/03/2019 à 13:49, Paul Menzel a écrit : >> On 19.02.19 10:44, Paul Menzel wrote: >> >>> On a the IBM S822LC (8335-GTA) with Ubuntu 18.10, and Linux 5.0-rc5+ >>> accessing `/sys/kernel/debug/kmemleak` takes a long time. According to >>> strace it takes three seconds. >>> >>> $ dmesg | grep leak >>> [    4.407957] kmemleak: Kernel memory leak detector initialized >>> [    4.407959] kmemleak: Automatic memory scanning thread started >>> [745989.625624] kmemleak: 1 new suspected memory leaks (see >>> /sys/kernel/debug/kmemleak) >>> [1002619.951902] kmemleak: 1 new suspected memory leaks (see >>> /sys/kernel/debug/kmemleak) >>> ``` >>> >>> Unfortunately, the leaks supposedly stored in that file are not shown >>> either. >> >> The problem is still present with Linux 5.0. Do you have an idea, how >> to fix this? > > Have you identified a previous version that works properly? It seems to have worked with Linux 4.18-rc4+ [1]. > If so, have you been able to bisect the problem? No, sorry, I have not. I do not have resources for this. Kind regards, Paul [1]: https://lists.ozlabs.org/pipermail/linuxppc-dev/2018-July/175658.html