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 S1752231Ab3ASTBP (ORCPT <rfc822;w@1wt.eu>);
	Sat, 19 Jan 2013 14:01:15 -0500
Received: from londo.lunn.ch ([80.238.139.98]:56044 "EHLO londo.lunn.ch"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1751554Ab3ASTBO (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Sat, 19 Jan 2013 14:01:14 -0500
Date: Sat, 19 Jan 2013 19:59:07 +0100
From: Andrew Lunn <andrew@lunn.ch>
To: Soeren Moch <smoch@web.de>
Cc: Arnd Bergmann <arnd@arndb.de>, Jason Cooper <jason@lakedaemon.net>,
        Greg KH <gregkh@linuxfoundation.org>,
        Thomas Petazzoni <thomas.petazzoni@free-electrons.com>,
        Andrew Lunn <andrew@lunn.ch>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        linux-kernel@vger.kernel.org, Michal Hocko <mhocko@suse.cz>,
        linux-mm@kvack.org, Kyungmin Park <kyungmin.park@samsung.com>,
        Mel Gorman <mgorman@suse.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        linaro-mm-sig@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Subject: Re: [PATCH v2] mm: dmapool: use provided gfp flags for all
 dma_alloc_coherent() calls
Message-ID: <20130119185907.GA20719@lunn.ch>
References: <20121119144826.f59667b2.akpm@linux-foundation.org>
 <201301171049.30415.arnd@arndb.de>
 <50F800EB.6040104@web.de>
 <201301172026.45514.arnd@arndb.de>
 <50FABBED.1020905@web.de>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <50FABBED.1020905@web.de>
User-Agent: Mutt/1.5.21 (2010-09-15)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

> Please find attached a debug log generated with your patch.
> 
> I used the sata disk and two em28xx dvb sticks, no other usb devices,
> no ethernet cable connected, tuners on saa716x-based card not used.
> 
> What I can see in the log: a lot of coherent mappings from sata_mv
> and orion_ehci, a few from mv643xx_eth, no other coherent mappings.
> All coherent mappings are page aligned, some of them (from orion_ehci)
> are not really small (as claimed in __alloc_from_pool).
> 
> I don't believe in a memory leak. When I restart vdr (the application
> utilizing the dvb sticks) then there is enough dma memory available
> again.

Hi Soeren

We should be able to rule out a leak. Mount debugfg and then:

while [ /bin/true ] ; do cat /debug/dma-api/num_free_entries ; sleep 60 ; done

while you are capturing. See if the number goes down.

      Andrew