Messages in this thread |  | | | Date | Tue, 18 Oct 2011 12:25:03 +0200 | | From | Philipp Herz - Profihost AG <> | | Subject | Vanilla-Kernel 3 - page allocation failure |
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After updating kernel (x86_64) to stable version 3 there are a few messages appearing in the kernel log such as
kworker/0:1: page allocation failure: order:1, mode:0x20 mysql: page allocation failure: order:1, mode:0x20 php5: page allocation failure: order:1, mode:0x20
Searching the net showed that these messages are known to occur since 2004.
Some people were able to get rid of them by setting /proc/sys/vm/min_free_kbytes to a high enough value. This does not help in our case.
Is there a kernel comand line argument to avoid these messages?
As of mm/page_alloc.c these messages are marked to be only warning messages and would not appear if 'gpf_mask' was set to __GFP_NOWARN in function warn_alloc_failed.
How does this mask get set? Is it set by the "external" process knocking at the memory manager?
What is the magic behind the 'order' and 'mode'?
I'm not a subscriber, so please CC me a copy of messages related to the subject. I'm not sure if I can help much by looking at the inside of the kernel, but I will try my best to answer any questions concerning this issue.
Best regards, Philipp
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