From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1756238AbcISCjw (ORCPT <rfc822;w@1wt.eu>);
        Sun, 18 Sep 2016 22:39:52 -0400
Received: from szxga01-in.huawei.com ([58.251.152.64]:34910 "EHLO
        szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1752443AbcISCjt (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Sun, 18 Sep 2016 22:39:49 -0400
Message-ID: <57DF4FEA.9080509@huawei.com>
Date: Mon, 19 Sep 2016 10:39:38 +0800
From: Xishi Qiu <qiuxishi@huawei.com>
User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:12.0) Gecko/20120428 Thunderbird/12.0.1
MIME-Version: 1.0
To: Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [question] hugetlb: how to find who use hugetlb?
Content-Type: text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding: 7bit
X-Originating-IP: [10.177.25.179]
X-CFilter-Loop: Reflected
X-Mirapoint-Virus-RAPID-Raw: score=unknown(0),
        refid=str=0001.0A020206.57DF4FF2.00AD,ss=1,re=0.000,recu=0.000,reip=0.000,cl=1,cld=1,fgs=0,
        ip=0.0.0.0,
        so=2013-06-18 04:22:30,
        dmn=2013-03-21 17:37:32
X-Mirapoint-Loop-Id: 4d41f65f06d73f78c51ad0af9ba8f69a
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

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