linux-kernel - Re: [PATCH v4] ARM64: dts: meson-gx: Add reserved memory zone and usable memory range

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Date:   Wed, 18 Jan 2017 01:27:16 +0100
From:   Andreas Färber <afaerber@...e.de>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     Kevin Hilman <khilman@...libre.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        xypron.glpk@....de,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Carlo Caione <carlo@...one.org>,
        Olof Johansson <olof@...om.net>,
        linux-amlogic@...ts.infradead.org,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4] ARM64: dts: meson-gx: Add reserved memory zone and
 usable memory range

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?

Regards,
Andreas

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