linux-kernel - Re: [patch] mm, hugetlb: include hugepages in meminfo

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Message-ID: <alpine.DEB.2.02.1303201145260.17761@chino.kir.corp.google.com>
Date:	Wed, 20 Mar 2013 11:46:12 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Michal Hocko <mhocko@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch] mm, hugetlb: include hugepages in meminfo

On Wed, 20 Mar 2013, Michal Hocko wrote:

> On Tue 19-03-13 17:18:12, David Rientjes wrote:
> > Particularly in oom conditions, it's troublesome that hugetlb memory is 
> > not displayed.  All other meminfo that is emitted will not add up to what 
> > is expected, and there is no artifact left in the kernel log to show that 
> > a potentially significant amount of memory is actually allocated as 
> > hugepages which are not available to be reclaimed.
> 
> Yes, I like the idea. It's bitten me already in the past.
> 
> The only objection I have is that you print only default_hstate. You
> just need to wrap your for_each_node_state by for_each_hstate to do
> that.  With that applied, feel free to add my
> Acked-by: Michal Hocko <mhocko@...e.cz>
> 

I didn't do this because it isn't already exported in /proc/meminfo and 
since we've made an effort to reduce the amount of information emitted by 
the oom killer at oom kill time to avoid spamming the kernel log, I only 
print the default hstate.
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