linux-kernel - Re: [PATCH v5 1/2] mm: hugetlb: proc: add HugetlbPages field to /proc/PID/smaps

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Message-ID: <20150917093914.GA18723@hori1.linux.bs1.fc.nec.co.jp>
Date:	Thu, 17 Sep 2015 09:39:15 +0000
From:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To:	Pádraig Brady <P@...igBrady.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Jörn Engel <joern@...estorage.com>,
	Mike Kravetz <mike.kravetz@...cle.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v5 1/2] mm: hugetlb: proc: add HugetlbPages field to
 /proc/PID/smaps

On Mon, Sep 07, 2015 at 11:52:41AM +0100, Pádraig Brady wrote:
...
> 
> By the same argument I presume the existing THP "AnonHugePages" smaps field
> is not accounted for in the {Private,Shared}_... fields?
> I.E. AnonHugePages may also benefit from splitting to Private/Shared?

smaps_pmd_entry() not only increments mss->anonymous_thp, but also calls
smaps_account() which updates mss->anonymous, mss->referenced and
mss->{shared,private}_{clean,dirty}, so thp's shared/private characteristic
is included in other existing fields.
I think that even if we know the thp-specific shared/private profiles, it
might be hard to do something beneficial using that information, so I feel
keeping this field as-is is ok for now.

Thanks,
Naoya Horiguchi