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xen: avoid allocation causing potential swap activity on the resume path

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commit b3831cb55d upstream.

Since the device we are resuming could be the device containing the
swap device we should ensure that the allocation cannot cause
IO.

On resume, this path is triggered when the running system tries to
continue using its devices.  If it cannot then the resume will fail;
to try to avoid this we let it dip into the emergency pools.

The majority of these changes were made when linux-2.6.18-xen.hg
changeset e8b49cfbdac0 was ported upstream in
a144ff09bc but somehow this hunk was
dropped.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ian Campbell
2010-05-25 10:45:35 +01:00
committed by Greg Kroah-Hartman
parent 410f6abbf0
commit 4cf008cd74
1 changed files with 1 additions and 1 deletions
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2
drivers/xen/xenbus/xenbus_xs.c
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@@ -499,7 +499,7 @@ int xenbus_printf(struct xenbus_transaction t,
#define PRINTF_BUFFER_SIZE 4096
char *printf_buffer;
printf_buffer = kmalloc(PRINTF_BUFFER_SIZE, GFP_KERNEL);
printf_buffer = kmalloc(PRINTF_BUFFER_SIZE, GFP_NOIO | __GFP_HIGH);
if (printf_buffer == NULL)
return -ENOMEM;