linux-kernel - Re: [PATCH v4 2/2] mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status

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Message-ID: <20150813211418.GE8588@Sligo.logfs.org>
Date:	Thu, 13 Aug 2015 14:14:18 -0700
From:	Jörn Engel <joern@...estorage.com>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 v4 2/2] mm: hugetlb: proc: add HugetlbPages field to
 /proc/PID/status

On Thu, Aug 13, 2015 at 12:45:33AM +0000, Naoya Horiguchi wrote:
> From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Subject: [PATCH] mm: hugetlb: proc: add HugetlbPages field to /proc/PID/status
> 
> Currently there's no easy way to get per-process usage of hugetlb pages, which
> is inconvenient because userspace applications which use hugetlb typically want
> to control their processes on the basis of how much memory (including hugetlb)
> they use. So this patch simply provides easy access to the info via
> /proc/PID/status.
> 
> With this patch, for example, /proc/PID/status shows a line like this:
> 
>   HugetlbPages:      20480 kB (10*2048kB)
> 
> If your system supports and enables multiple hugepage sizes, the line looks
> like this:
> 
>   HugetlbPages:    1069056 kB (1*1048576kB 10*2048kB)
> 
> , so you can easily know how many hugepages in which pagesize are used by a
> process.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

Acked-by: Joern Engel <joern@...fs.org>

Jörn

--
Computer system analysis is like child-rearing; you can do grievous damage,
but you cannot ensure success."
-- Tom DeMarco
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