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SubjectLinux 4.10-rc2 arm: dmesg flooded with alloc_contig_range: [X, Y) PFNs busy
Date
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@osg.samsung.com

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