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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