[PATCH] swsusp: make image size limit tunable
Make the suspend image size limit tunable via /sys/power/image_size.
It is necessary for systems on which there is a limited amount of swap
available for suspend. It can also be useful for optimizing performance of
swsusp on systems with 1 GB of RAM or more.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 9e51cdf..e24446f 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -365,9 +365,29 @@
power_attr(resume);
+static ssize_t image_size_show(struct subsystem * subsys, char *buf)
+{
+ return sprintf(buf, "%u\n", image_size);
+}
+
+static ssize_t image_size_store(struct subsystem * subsys, const char * buf, size_t n)
+{
+ unsigned int size;
+
+ if (sscanf(buf, "%u", &size) == 1) {
+ image_size = size;
+ return n;
+ }
+
+ return -EINVAL;
+}
+
+power_attr(image_size);
+
static struct attribute * g[] = {
&disk_attr.attr,
&resume_attr.attr,
+ &image_size_attr.attr,
NULL,
};