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 S1754106AbdARLAA (ORCPT <rfc822;w@1wt.eu>);
        Wed, 18 Jan 2017 06:00:00 -0500
Received: from mail-wm0-f41.google.com ([74.125.82.41]:33971 "EHLO
        mail-wm0-f41.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1752727AbdARK75 (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Wed, 18 Jan 2017 05:59:57 -0500
Subject: Re: [PATCH v4] ARM64: dts: meson-gx: Add reserved memory zone and
 usable memory range
To: =?UTF-8?Q?Andreas_F=c3=a4rber?= <afaerber@suse.de>
References: <1484129414-23325-1-git-send-email-narmstrong@baylibre.com>
 <m21sw66828.fsf@baylibre.com> <d3a00788-c3c1-4b10-90bf-2a8bc6a138f8@suse.de>
 <7fcb8d94-840a-de2c-f43b-9123ccc65514@baylibre.com>
 <CAOesGMhYfhrd-hy=N-FYDEPmumR0=QNzn5xTLxFuKG7apo5qiw@mail.gmail.com>
 <ecb5ff50-f5d5-ffe6-0732-faf5e51906f8@baylibre.com>
 <04113569-e342-77ff-f79a-2c9c4dc4c602@suse.de>
 <6bba535f-42bc-3e4b-129b-adc39152cfeb@suse.de>
Cc: Kevin Hilman <khilman@baylibre.com>,
        "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
        xypron.glpk@gmx.de,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Carlo Caione <carlo@caione.org>, Olof Johansson <olof@lixom.net>,
        linux-amlogic@lists.infradead.org,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>
From: Neil Armstrong <narmstrong@baylibre.com>
Organization: Baylibre
Message-ID: <0d34e6b4-17cc-cfa3-4d10-6a4dc2afbf98@baylibre.com>
Date: Wed, 18 Jan 2017 11:58:08 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
 Thunderbird/45.3.0
MIME-Version: 1.0
In-Reply-To: <6bba535f-42bc-3e4b-129b-adc39152cfeb@suse.de>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On 01/18/2017 01:27 AM, Andreas Färber wrote:
> Am 18.01.2017 um 01:00 schrieb Andreas Färber:
>> Am 17.01.2017 um 09:21 schrieb Neil Armstrong:
>>> The stress-ng package provides this "stress" command and is used to force the kernel to map more memory
>>> zones, but I also got the issue while running a fully fledged Desktop Environment thanks to the
>>> recently merged DRM driver.
>>> You may not be able to trigger the issue since it seems Amlogic reduces this reserved size on GXL/GXM :
>>> https://github.com/khadas/linux/commit/698df2c6cfbb0d1a9359743208e83517b31da6ce
>>> But it should be confirmed.
>>
>> Confirming no issues on three runs on meson-gxm-rbox-pro:
>>
>> boxer:~ # stress-ng --vm 4 --vm-bytes 128M --timeout 10s &
>> [1] 2528
>> boxer:~ # stress-ng: info:  [2528] dispatching hogs: 4 vm
>> stress-ng: info:  [2528] cache allocate: default cache size: 256K
>> stress-ng: info:  [2528] successful run completed in 10.07s
>>
>> [1]+  Done                    stress-ng --vm 4 --vm-bytes 128M --timeout 10s
>> boxer:~ # stress-ng --vm 4 --vm-bytes 128M --timeout 10s
>> stress-ng: info:  [2537] dispatching hogs: 4 vm
>> stress-ng: info:  [2537] cache allocate: default cache size: 256K
>> stress-ng: info:  [2537] successful run completed in 10.07s
>> boxer:~ # stress-ng --vm 4 --vm-bytes 128M --timeout 10s
>> stress-ng: info:  [2546] dispatching hogs: 4 vm
>> stress-ng: info:  [2546] cache allocate: default cache size: 256K
>> stress-ng: info:  [2546] successful run completed in 10.07s
>> boxer:~ #
> 
> Similar results on meson-gxbb-vega-s95-telos (except 512K cache size),
> with both mainline EFI and vendor U-Boot.
> 
> I notice that I don't have CONFIG_DRM enabled - maybe related?

Yes, It may add more pressure on the memory allocation.

Neil

> 
> Regards,
> Andreas
>