linux-kernel - Re: Misleading OOM messages

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Message-ID: <alpine.DEB.2.00.0905151235220.925@chino.kir.corp.google.com>
Date:	Fri, 15 May 2009 12:37:03 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Nick Piggin <npiggin@...e.de>, Mel Gorman <mel@....ul.ie>,
	San Mehat <san@...roid.com>, Arve Hj?nnev?g <arve@...roid.com>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>
Subject: Re: Misleading OOM messages

On Fri, 15 May 2009, Dave Hansen wrote:

> We get a wee bit of info out for the cgroups case at least:
> 
> void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask)
> {
> ...
>         if (oom_kill_process(p, gfp_mask, 0, points, mem,
>                                 "Memory cgroup out of memory"))
>                 goto retry;
> 
> That can surely be improved, but it's a decent start.
> 

Cpusets are also cgroups and have their own oom handling logic 
(CONSTRAINT_CPUSET and the penalization of the badness score for not 
sharing memory with current's set of allowed nodes).  In this case, we're 
interested in only the nodes set in cpuset_current_mems_allowed, for 
instance, and not the entire state of the machine for exclusive cpusets.
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