From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx167.postini.com [74.125.245.167]) by kanga.kvack.org (Postfix) with SMTP id CAD106B0083 for ; Wed, 23 May 2012 13:23:14 -0400 (EDT) Date: Wed, 23 May 2012 19:21:46 +0200 From: Oleg Nesterov Subject: Re: 3.4-rc7: BUG: Bad rss-counter state mm:ffff88040b56f800 idx:1 val:-59 Message-ID: <20120523172146.GA27598@redhat.com> References: <4FBC1618.5010408@fold.natur.cuni.cz> <20120522162835.c193c8e0.akpm@linux-foundation.org> <20120522162946.2afcdb50.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120522162946.2afcdb50.akpm@linux-foundation.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Martin Mokrejs , LKML , khlebnikov@openvz.org, markus@trippelsdorf.de, hughd@google.com, kamezawa.hiroyu@jp.fujitsu.com, Michal Hocko , linux-mm@kvack.org On 05/22, Andrew Morton wrote: > > Also, I have a note here that Oleg was unhappy with the patch. Oleg > happiness is important. Has he cheered up yet? Well, yes, I do not really like this patch ;) Because I think there is a more simple/straightforward fix, see below. In my opinion it also makes the original code simpler. But. Obviously this is subjective, I can't prove my patch is "better", and I didn't try to test it. So I won't argue with Konstantin who dislikes my patch, although I would like to know the reason. Oleg. --- a/kernel/tsacct.c +++ b/kernel/tsacct.c @@ -91,6 +91,7 @@ void xacct_add_tsk(struct taskstats *sta stats->virtmem = p->acct_vm_mem1 * PAGE_SIZE / MB; mm = get_task_mm(p); if (mm) { + sync_mm_rss(mm); /* adjust to KB unit */ stats->hiwater_rss = get_mm_hiwater_rss(mm) * PAGE_SIZE / KB; stats->hiwater_vm = get_mm_hiwater_vm(mm) * PAGE_SIZE / KB; --- a/kernel/exit.c +++ b/kernel/exit.c @@ -643,6 +643,8 @@ static void exit_mm(struct task_struct * mm_release(tsk, mm); if (!mm) return; + + sync_mm_rss(mm); /* * Serialize with any possible pending coredump. * We must hold mmap_sem around checking core_state @@ -960,9 +962,6 @@ void do_exit(long code) preempt_count()); acct_update_integrals(tsk); - /* sync mm's RSS info before statistics gathering */ - if (tsk->mm) - sync_mm_rss(tsk->mm); group_dead = atomic_dec_and_test(&tsk->signal->live); if (group_dead) { hrtimer_cancel(&tsk->signal->real_timer); --- a/fs/exec.c +++ b/fs/exec.c @@ -823,10 +823,10 @@ static int exec_mmap(struct mm_struct *m /* Notify parent that we're no longer interested in the old VM */ tsk = current; old_mm = current->mm; - sync_mm_rss(old_mm); mm_release(tsk, old_mm); if (old_mm) { + sync_mm_rss(old_mm); /* * Make sure that if there is a core dump in progress * for the old mm, we get out and die instead of going -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org