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xen: Avoid allocations causing swap activity on the resume path

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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 <[email protected]>
Signed-off-by: Jeremy Fitzhardinge <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Ian Campbell 2008-06-17 10:47:08 +02:00 • committed by Jens Axboe
commit a144ff09bc
4 changed files with 11 additions and 10 deletions
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2
drivers/xen/xenbus/xenbus_client.c
View file

@ -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) {

10
drivers/xen/xenbus/xenbus_xs.c
View file

@ -283,9 +283,9 @@ static char *join(const char *dir, const char *name)
char *buffer;
if (strlen(name) == 0)
buffer = kasprintf(GFP_KERNEL, "%s", dir);
buffer = kasprintf(GFP_NOIO | __GFP_HIGH, "%s", dir);
else
buffer = kasprintf(GFP_KERNEL, "%s/%s", dir, name);
buffer = kasprintf(GFP_NOIO | __GFP_HIGH, "%s/%s", dir, name);
return (!buffer) ? ERR_PTR(-ENOMEM) : buffer;
}
@ -297,7 +297,7 @@ static char **split(char *strings, unsigned int len, unsigned int *num)
*num = count_strings(strings, len);
/* Transfer to one big alloc for easy freeing. */
ret = kmalloc(*num * sizeof(char *) + len, GFP_KERNEL);
ret = kmalloc(*num * sizeof(char *) + len, GFP_NOIO | __GFP_HIGH);
if (!ret) {
kfree(strings);
return ERR_PTR(-ENOMEM);
@ -751,7 +751,7 @@ static int process_msg(void)
}
msg = kmalloc(sizeof(*msg), GFP_KERNEL);
msg = kmalloc(sizeof(*msg), GFP_NOIO | __GFP_HIGH);
if (msg == NULL) {
err = -ENOMEM;
goto out;
@ -763,7 +763,7 @@ static int process_msg(void)
goto out;
}
body = kmalloc(msg->hdr.len + 1, GFP_KERNEL);
body = kmalloc(msg->hdr.len + 1, GFP_NOIO | __GFP_HIGH);
if (body == NULL) {
kfree(msg);
err = -ENOMEM;