From: Mike Galbraith <mgalbraith@novell.com>
To: paulmck@linux.vnet.ibm.com
Cc: LKML <linux-kernel@vger.kernel.org>, Miklos Szeredi <mszeredi@suse.cz>
Subject: Re: rcu: endless stalls
Date: Mon, 11 Jun 2012 19:20:14 +0200 [thread overview]
Message-ID: <1339435214.7358.43.camel@marge.simpson.net> (raw)
In-Reply-To: <1339424543.7350.101.camel@marge.simpson.net>
On Mon, 2012-06-11 at 16:22 +0200, Mike Galbraith wrote:
> On Mon, 2012-06-11 at 06:39 -0700, Paul E. McKenney wrote:
> > On Mon, Jun 11, 2012 at 12:06:16PM +0200, Mike Galbraith wrote:
> > > Greetings,
> > >
> > > I received a report of a 48 core UV box hitting a gripe, taking longer
> > > than timeout to emit same, so box griped endlessly, forcing reboot.
> >
> > So it took minutes to print an RCU CPU stall warning? On only 48 CPUs?
> >
> > If so, yow!!!
>
> The report was a tad fuzzy on details, but serial console can take a
> while at low baud rate, and the box was apparently perma-stalled.
Gee, no wonder it took a while to emit the gripe, there were a few more
than 48 CPUs actually.. 4048 more to be precise.
4096 tasks on 4096 CPUs all hammering wait_lock at once r!pretty.
2aa15890 - mm: prevent concurrent unmap_mapping_range() on the same inode
-Mike
next prev parent reply other threads:[~2012-06-11 17:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-11 10:06 Mike Galbraith
2012-06-11 13:39 ` Paul E. McKenney
2012-06-11 14:22 ` Mike Galbraith
2012-06-11 16:54 ` Paul E. McKenney
2012-06-11 17:20 ` Mike Galbraith [this message]
2012-06-11 18:01 ` Paul E. McKenney
2012-06-11 18:10 ` Mike Galbraith
2012-06-13 3:35 ` Mike Galbraith
2012-06-13 4:31 ` Hugh Dickins
2012-06-13 5:56 ` Mike Galbraith
2012-06-13 7:12 ` Mike Galbraith
2012-06-14 7:45 ` Mike Galbraith
2012-06-14 16:47 ` Paul E. McKenney
2012-06-14 21:34 ` Mike Galbraith
2012-06-15 7:49 ` Mike Galbraith
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