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 S1752689AbcBEMDP (ORCPT <rfc822;w@1wt.eu>);
	Fri, 5 Feb 2016 07:03:15 -0500
Received: from b.mail.tornado.no ([195.159.29.130]:42148 "EHLO
	mailstore06.sysedata.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1750850AbcBEMDN (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Fri, 5 Feb 2016 07:03:13 -0500
X-Greylist: delayed 1103 seconds by postgrey-1.27 at vger.kernel.org; Fri, 05 Feb 2016 07:03:13 EST
Subject: Re: [RFC] why the amount of cache from "free -m" and /proc/meminfo
 are different?
To: Xishi Qiu <qiuxishi@huawei.com>, Linux MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>
References: <56B45457.4010702@huawei.com>
From: "Daniel K." <dk@syse.no>
Message-ID: <56B48B2D.4020502@syse.no>
Date: Fri, 5 Feb 2016 11:44:45 +0000
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Icedove/38.0.1
MIME-Version: 1.0
In-Reply-To: <56B45457.4010702@huawei.com>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 02/05/2016 07:50 AM, Xishi Qiu wrote:
> [root@localhost ~]# free -m
>               total        used        free      shared  buff/cache   available
> Mem:          48295         574       41658           8        6062       46344
> Swap:         24191           0       24191
> 
> [root@localhost ~]# cat /proc/meminfo
> Buffers:               0 kB
> Cached:          3727824 kB
> Slab:            2480092 kB

free and meminfo seems to match up pretty well to me.

Are you really asking about display in MB vs kB?

Drop the -m switch to free.

Also, give 'man free' a spin, it explains what's behind the numbers.


Daniel K.