On 03/11/15 23:16, Andrew Morton wrote:
(switched to email. Please respond via emailed reply-to-all, not via the
bugzilla web interface).
OK.
On Tue, 03 Nov 2015 16:21:06 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=107111
Bug ID: 107111
Summary: page allocation failure but there seem to be free
pages
Product: Memory Management
Version: 2.5
Kernel Version: 4.2.3
Hardware: IA-64
18
Note: IA64. It isn't tested much and perhaps this triggered an oddity.
Sorry, user error, it's x86-64, not IA64, a KVM guest running on a
"Intel(R) Xeon(R) CPU 3050".
The kernel could and should have satisfied this order-1 GFP_ATOMIC
IRQ-context allocation from the DMA zone. But it did not do so. Bug.
Looking back in my kern.logs I confirm that I've only seen this on
kernel 4.2.3, never on the 3.18.19 I was running up to 16/10/2015. It
happens up to 15 times a day, and, so far, hasn't happened since I upped
/proc/sys/vm/min_free_kbytes to 8192.
--
John Hughes.
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