Date: Tue, 11 Aug 2015 16:48:56 -0700 (PDT)
From: David Rientjes <rientjes@google.com>
To: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
cc: Andrew Morton <akpm@linux-foundation.org>,
        =?UTF-8?Q?J=C3=B6rn_Engel?= <joern@purestorage.com>,
        Mike Kravetz <mike.kravetz@oracle.com>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Naoya Horiguchi <nao.horiguchi@gmail.com>
Subject: Re: [PATCH v2 1/2] smaps: fill missing fields for vma(VM_HUGETLB)
In-Reply-To: <20150811233237.GA32192@hori1.linux.bs1.fc.nec.co.jp>
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On Tue, 11 Aug 2015, Naoya Horiguchi wrote:

> > This memory was not included in rss originally because memory in the 
> > hugetlb persistent pool is always resident.  Unmapping the memory does not 
> > free memory.  For this reason, hugetlb memory has always been treated as 
> > its own type of memory.
> 
> Right, so it might be better not to use the word "RSS" for hugetlb, maybe
> something like "HugetlbPages:" seems better to me.
> 

When the pagesize is also specified, as it is in smaps, I think this would 
be the best option.  Note that we can't distinguish between variable 
hugetlb sizes with VmFlags alone.
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