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authorIan Campbell <ian.campbell@citrix.com>2008-06-17 10:47:08 +0200
committerJens Axboe <jens.axboe@oracle.com>2008-07-03 13:21:13 +0200
commita144ff09bc52ef3f3684ed23eadc9c7c0e57b3aa (patch)
tree344aa7d4722c4b2c39ca3e2fed302f0ff4d5668b /drivers/xen/xenbus/xenbus_client.c
parent5a60d0cd4ff227c4c5212898ecbeeaf5662eb5fa (diff)
downloadlinux-stericsson-a144ff09bc52ef3f3684ed23eadc9c7c0e57b3aa.tar.gz
xen: Avoid allocations causing swap activity on the resume path
Avoid allocations causing swap activity on the resume path by preventing the allocations from doing IO and allowing them to access the emergency pools. These paths are used when a frontend device is trying to connect to its backend driver over Xenbus. These reconnections are triggered on demand by IO, so by definition there is already IO underway, and further IO would naturally deadlock. 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. [ linux-2.6.18-xen changesets e8b49cfbdac, fdb998e79aba ] Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'drivers/xen/xenbus/xenbus_client.c')
-rw-r--r--drivers/xen/xenbus/xenbus_client.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/xen/xenbus/xenbus_client.c b/drivers/xen/xenbus/xenbus_client.c
index 0f86b0ff7879..9678b3e98c63 100644
--- a/drivers/xen/xenbus/xenbus_client.c
+++ b/drivers/xen/xenbus/xenbus_client.c
@@ -117,7 +117,7 @@ int xenbus_watch_pathfmt(struct xenbus_device *dev,
char *path;
va_start(ap, pathfmt);
- path = kvasprintf(GFP_KERNEL, pathfmt, ap);
+ path = kvasprintf(GFP_NOIO | __GFP_HIGH, pathfmt, ap);
va_end(ap);
if (!path) {