From: Fengguang Wu <fengguang.wu@intel.com>
To: "Toralf Förster" <toralf.foerster@gmx.de>
Cc: Richard Weinberger <richard@nod.at>, Jan Kara <jack@suse.cz>,
Geert Uytterhoeven <geert@linux-m68k.org>,
UML devel <user-mode-linux-devel@lists.sourceforge.net>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
hannes@cmpxchg.org, darrick.wong@oracle.com,
Michal Hocko <mhocko@suse.cz>
Subject: Re: [uml-devel] BUG: soft lockup for a user mode linux image
Date: Fri, 11 Oct 2013 17:05:34 +0800 [thread overview]
Message-ID: <20131011090534.GA29330@localhost> (raw)
In-Reply-To: <20131011085701.GA27382@localhost>
On Fri, Oct 11, 2013 at 04:57:01PM +0800, Fengguang Wu wrote:
> On Fri, Oct 11, 2013 at 10:42:19AM +0200, Toralf FA?rster wrote:
> > yeah, now the picture becomes more clear
> > ...
> > net.core.warnings = 0 [ ok ]
> > ick: pause : -717
> > ick : min_pause : -177
> > ick : max_pause : -717
> > ick: pages_dirtied : 14
> > ick: task_ratelimit: 0
>
> Great and thanks! So it's the max pause calculation went wrong.
However I still suspect this is not the main reason for the soft
lockup. Because schedule_timeout() will directly return on negative
timeout. So yes, we have encountered some negative pauses, however
we still need to fix the huge dirtied pages problem which should be
more fundamental.
Thanks,
Fengguang
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next prev parent reply other threads:[~2013-10-11 9:05 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
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[not found] ` <525591AD.4060401@gmx.de>
2013-10-09 18:43 ` [uml-devel] BUG: soft lockup for a user mode linux image Richard Weinberger
2013-10-09 21:47 ` Jan Kara
2013-10-09 22:33 ` Richard Weinberger
2013-10-10 16:49 ` Toralf Förster
2013-10-11 1:16 ` Fengguang Wu
2013-10-11 8:42 ` Toralf Förster
2013-10-11 8:57 ` Fengguang Wu
2013-10-11 9:05 ` Fengguang Wu [this message]
2013-10-11 14:12 ` Toralf Förster
2013-10-12 0:43 ` [PATCH] writeback: fix negative bdi max pause Fengguang Wu
2013-10-12 4:45 ` [PATCH v2] " Fengguang Wu
2013-10-14 12:34 ` Jan Kara
2013-10-10 2:46 ` [uml-devel] BUG: soft lockup for a user mode linux image Fengguang Wu
2013-10-10 6:52 ` Geert Uytterhoeven
2013-10-10 7:03 ` Fengguang Wu
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