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=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,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 411DFC31E46 for ; Wed, 12 Jun 2019 18:40:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 184FD206E0 for ; Wed, 12 Jun 2019 18:40:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2403756AbfFLSkh (ORCPT ); Wed, 12 Jun 2019 14:40:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:51962 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726724AbfFLSke (ORCPT ); Wed, 12 Jun 2019 14:40:34 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id E62313082A9B; Wed, 12 Jun 2019 18:40:28 +0000 (UTC) Received: from x230.aquini.net (dhcp-17-61.bos.redhat.com [10.18.17.61]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4CA6B6015E; Wed, 12 Jun 2019 18:40:28 +0000 (UTC) Date: Wed, 12 Jun 2019 14:40:26 -0400 From: Rafael Aquini To: Joel Savitz Cc: linux-kernel@vger.kernel.org, Andrew Morton , David Rientjes , linux-mm@kvack.org Subject: Re: [RESEND PATCH v2] mm/oom_killer: Add task UID to info message on an oom kill Message-ID: <20190612184026.GD5313@x230.aquini.net> References: <1560362273-534-1-git-send-email-jsavitz@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1560362273-534-1-git-send-email-jsavitz@redhat.com> User-Agent: Mutt/1.11.3 (2019-02-01) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Wed, 12 Jun 2019 18:40:34 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 12, 2019 at 01:57:53PM -0400, Joel Savitz wrote: > In the event of an oom kill, useful information about the killed > process is printed to dmesg. Users, especially system administrators, > will find it useful to immediately see the UID of the process. > > In the following example, abuse_the_ram is the name of a program > that attempts to iteratively allocate all available memory until it is > stopped by force. > > Current message: > > Out of memory: Killed process 35389 (abuse_the_ram) > total-vm:133718232kB, anon-rss:129624980kB, file-rss:0kB, > shmem-rss:0kB > > Patched message: > > Out of memory: Killed process 2739 (abuse_the_ram), > total-vm:133880028kB, anon-rss:129754836kB, file-rss:0kB, > shmem-rss:0kB, UID 0 > > > Suggested-by: David Rientjes > Signed-off-by: Joel Savitz > --- > mm/oom_kill.c | 5 +++-- > 1 file changed, 3 insertions(+), 2 deletions(-) > > diff --git a/mm/oom_kill.c b/mm/oom_kill.c > index 3a2484884cfd..af2e3faa72a0 100644 > --- a/mm/oom_kill.c > +++ b/mm/oom_kill.c > @@ -874,12 +874,13 @@ static void __oom_kill_process(struct task_struct *victim, const char *message) > */ > do_send_sig_info(SIGKILL, SEND_SIG_PRIV, victim, PIDTYPE_TGID); > mark_oom_victim(victim); > - pr_err("%s: Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB\n", > + pr_err("%s: Killed process %d (%s) total-vm:%lukB, anon-rss:%lukB, file-rss:%lukB, shmem-rss:%lukB, UID %d\n", > message, task_pid_nr(victim), victim->comm, > K(victim->mm->total_vm), > K(get_mm_counter(victim->mm, MM_ANONPAGES)), > K(get_mm_counter(victim->mm, MM_FILEPAGES)), > - K(get_mm_counter(victim->mm, MM_SHMEMPAGES))); > + K(get_mm_counter(victim->mm, MM_SHMEMPAGES)), > + from_kuid(&init_user_ns, task_uid(victim))); > task_unlock(victim); > > /* > -- > 2.18.1 > Acked-by: Rafael Aquini