linux-kernel - Re: [PATCH v2 1/2] smaps: fill missing fields for vma(VM

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Message-Id: <20150807155059.dbfdbdeacd4e9c9397901b7e@linux-foundation.org>
Date:	Fri, 7 Aug 2015 15:50:59 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	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 v2 1/2] smaps: fill missing fields for vma(VM_HUGETLB)

On Fri, 7 Aug 2015 07:24:50 +0000 Naoya Horiguchi <n-horiguchi@...jp.nec.com> wrote:

> Currently smaps reports many zero fields for vma(VM_HUGETLB), which is
> inconvenient when we want to know per-task or per-vma base hugetlb usage.
> This patch enables these fields by introducing smaps_hugetlb_range().
> 
> before patch:
> 
>   Size:              20480 kB
>   Rss:                   0 kB
>   Pss:                   0 kB
>   Shared_Clean:          0 kB
>   Shared_Dirty:          0 kB
>   Private_Clean:         0 kB
>   Private_Dirty:         0 kB
>   Referenced:            0 kB
>   Anonymous:             0 kB
>   AnonHugePages:         0 kB
>   Swap:                  0 kB
>   KernelPageSize:     2048 kB
>   MMUPageSize:        2048 kB
>   Locked:                0 kB
>   VmFlags: rd wr mr mw me de ht
> 
> after patch:
> 
>   Size:              20480 kB
>   Rss:               18432 kB
>   Pss:               18432 kB
>   Shared_Clean:          0 kB
>   Shared_Dirty:          0 kB
>   Private_Clean:         0 kB
>   Private_Dirty:     18432 kB
>   Referenced:        18432 kB
>   Anonymous:         18432 kB
>   AnonHugePages:         0 kB
>   Swap:                  0 kB
>   KernelPageSize:     2048 kB
>   MMUPageSize:        2048 kB
>   Locked:                0 kB
>   VmFlags: rd wr mr mw me de ht
> 

Is there something we can say about this in
Documentation/filesystems/proc.txt?

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