linux-kernel - Linux 4.10-rc2 arm: dmesg flooded with alloc_contig

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Date:   Tue, 17 Jan 2017 17:23:03 -0700
From:   Shuah Khan <shuahkh@....samsung.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, vbabka@...e.cz,
        mgorman@...hsingularity.net, mhocko@...e.com, hannes@...xchg.org,
        iamjoonsoo.kim@....com, izumi.taku@...fujitsu.com
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Shuah Khan <shuahkh@....samsung.com>, linux-mm@...ck.org
Subject: Linux 4.10-rc2 arm: dmesg flooded with alloc_contig_range: [X, Y)
 PFNs busy

Hi,

dmesg floods with PFNs busy messages.

[10119.071455] alloc_contig_range: [bb900, bbc00) PFNs busy
[10119.071631] alloc_contig_range: [bba00, bbd00) PFNs busy
[10119.071762] alloc_contig_range: [bbb00, bbe00) PFNs busy
[10119.071940] alloc_contig_range: [bbc00, bbf00) PFNs busy
[10119.072039] alloc_contig_range: [bbd00, bc000) PFNs busy
[10119.072188] alloc_contig_range: [bbe00, bc100) PFNs busy
[10119.072301] alloc_contig_range: [bbf00, bc200) PFNs busy
[10119.072403] alloc_contig_range: [bc000, bc300) PFNs busy
[10119.072549] alloc_contig_range: [bc100, bc400) PFNs busy
[10119.072584] [drm:exynos_drm_gem_create] *ERROR* failed to allocate buffer.

I think this is triggered when drm tries to allocate CMA buffers.
I might have seen one or two messages in 4.9, but since 4.10, it
just floods dmesg.

Is this a known problem? I am seeing this on odroid-xu4

Linux odroid 4.10.0-rc2-00251-ge03c755-dirty #12 SMP PREEMPT
Wed Jan 11 23:12:52 UTC 2017 armv7l armv7l armv7l GNU/Linux

thanks,
-- Shuah

-- 
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@....samsung.com