* Vanilla-Kernel 3 - page allocation failure
@ 2011-10-18 10:24 Philipp Herz - Profihost AG
2011-10-19 2:09 ` David Rientjes
0 siblings, 1 reply; 2+ messages in thread
From: Philipp Herz - Profihost AG @ 2011-10-18 10:24 UTC (permalink / raw)
To: linux-mm
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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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Vanilla-Kernel 3 - page allocation failure
2011-10-18 10:24 Vanilla-Kernel 3 - page allocation failure Philipp Herz - Profihost AG
@ 2011-10-19 2:09 ` David Rientjes
0 siblings, 0 replies; 2+ messages in thread
From: David Rientjes @ 2011-10-19 2:09 UTC (permalink / raw)
To: Philipp Herz - Profihost AG; +Cc: linux-mm
On Tue, 18 Oct 2011, Philipp Herz - Profihost AG wrote:
> After updating kernel (x86_64) to stable version 3 there are a few messages
> appearing in the kernel log such as
>
Looks like you posted this separately on two different lists, please see
my reply at https://lkml.org/lkml/2011/10/18/506 and respond directly to
that post. Thanks!
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