linux-kernel - shmem info issue

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Message-ID: <CAJ8eaTw9o+ZBAzR+1qe-5XEpfZzv-6DJ_EHK_BF_32-va-KL+g@mail.gmail.com>
Date:	Fri, 12 Jul 2013 17:08:32 +0530
From:	naveen yadav <yad.naveen@...il.com>
To:	kernelnewbies <Kernelnewbies@...nelnewbies.org>,
	linux-kernel@...r.kernel.org
Subject: shmem info issue

 Hi All

I am working on tmpfs. During code analysis I found shmem driver
register itself as tmpfs .

cat /proc/meminfo Shmem field read NR_SHMEM enum filed and shows used
memory in tmpfs


[root@...alhost linux-3.8.2]# cat /proc/meminfo | grep -r Shmem
Shmem:               704 kB
[root@...alhost linux-3.8.2]#

include/linux/mmzone.h
enum zone_stat_item {
-----cut here-------
 NR_SHMEM,               /* shmem pages (included tmpfs/GEM pages
 -----cut here
}

I have the following query
1-> cat /proc/meminfo | grep -r Shmem show only the used tmpfs memory
or it show used  tmpfs memory + mata data also (because I found Shmem
is bit larger then tempfs used memory )
2-> as per the developer comments NR_SHMEM included tmpfs and GEM
pages whct is Gem pages
3-> is my above code analysis is correct?
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