linux-kernel - Re: + mm-show_mem-suppress-page-counts-in-non-blockable-contexts.patch added to -mm tree

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Message-ID: <20130301102355.GC21443@dhcp22.suse.cz>
Date:	Fri, 1 Mar 2013 11:23:55 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	David Rientjes <rientjes@...gle.com>
Cc:	akpm@...ux-foundation.org, mm-commits@...r.kernel.org,
	dave@...ux.vnet.ibm.com, mgorman@...e.de, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: +
 mm-show_mem-suppress-page-counts-in-non-blockable-contexts.patch added to
 -mm tree

On Fri 01-03-13 02:15:04, David Rientjes wrote:
> On Fri, 1 Mar 2013, Michal Hocko wrote:
> 
> > I have already asked about it in the original thread but didn't get any
> > answer. How can we get a soft lockup when all implementations of show_mem
> > call touch_nmi_watchdog?
> > 
> 
> Feel free to do s/soft lockups/irqs being disabled for an extremely long 
> time/.

OK, that sounds better. Sorry for being so persistent on this but soft
lockups tend to be a real issue for distribution kernels with
!CONFIG_PREEMPT so anything that fixes soft lockups raises a red flag.

Acked-by: Michal Hocko <mhocko@...e.cz>
-- 
Michal Hocko
SUSE Labs
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