linux-kernel - [question] hugetlb: how to find who use hugetlb?

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Date:   Mon, 19 Sep 2016 10:39:38 +0800
From:   Xishi Qiu <qiuxishi@...wei.com>
To:     Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [question] hugetlb: how to find who use hugetlb?

On my system, I set HugePages_Total to 2G(1024 x 2M), and I use 1G hugetlb,
but the HugePages_Free is not 1G(512 x 2M), it is 280(280 x 2M) left,
HugePages_Rsvd is 0, it seems someone use 232(232 x 2M) hugetlb additionally.

So how to find who use the additional hugetlb? 

I search every process and find the total hugetlb size is only 1G,
cat /proc/xx/smaps | grep KernelPageSize, then account the vma size
which KernelPageSize is 2048 kB.

Thanks,
Xishi Qiu