linux-kernel - Re: [PATCH] smaps: fill missing fields for vma(VM

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Message-ID: <20150806074443.GA7870@hori1.linux.bs1.fc.nec.co.jp>
Date:	Thu, 6 Aug 2015 07:44:44 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Jörn Engel <joern@...estorage.com>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] smaps: fill missing fields for vma(VM_HUGETLB)

On Wed, Aug 05, 2015 at 07:18:44PM -0700, David Rientjes wrote:
...
> Hmm, wouldn't this be confusing since VmRSS in /proc/pid/status doesn't 
> match the rss shown in smaps, since hugetlb mappings aren't accounted in 
> get_mm_rss()?
> 
> Not sure this is a good idea, I think consistency amongst rss values would 
> be more important.

Right, so one option is making get_mm_rss() count hugetlb, but that could
make oom/memcg less efficient or broken as you stated in a previous email.
So another one is to add "VmHugetlbRSS:" field in /proc/pid/status?

Thanks,
Naoya Horiguchi