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authorRafael J. Wysocki <rjw@sisk.pl>2006-01-06 00:15:56 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-06 08:33:42 -0800
commitca0aec0f7a94bf9f07fefa8bfd23282d4e8ceb8a (patch)
tree5f31f11eba908545d5e02698fe9c163a8612dd26 /kernel/power
parentb3a93a255ec33a04776ec50efb30b7a99168dda2 (diff)
[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>
Diffstat (limited to 'kernel/power')
-rw-r--r--kernel/power/disk.c20
-rw-r--r--kernel/power/power.h7
-rw-r--r--kernel/power/swsusp.c10
3 files changed, 31 insertions, 6 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 9e51cdf7b78..e24446f8d8c 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -365,9 +365,29 @@ out:
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,
};
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 9b045990361..273a5b1d70b 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -52,11 +52,8 @@ extern const void __nosave_begin, __nosave_end;
extern unsigned int nr_copy_pages;
extern struct pbe *pagedir_nosave;
-/*
- * Preferred image size in MB (set it to zero to get the smallest
- * image possible)
- */
-#define IMAGE_SIZE 500
+/* Preferred image size in MB (default 500) */
+extern unsigned int image_size;
extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index 6d5ceaf4c36..d760a6a719f 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -69,6 +69,14 @@
#include "power.h"
+/*
+ * Preferred image size in MB (tunable via /sys/power/image_size).
+ * When it is set to N, swsusp will do its best to ensure the image
+ * size will not exceed N MB, but if that is impossible, it will
+ * try to create the smallest image possible.
+ */
+unsigned int image_size = 500;
+
#ifdef CONFIG_HIGHMEM
unsigned int count_highmem_pages(void);
int save_highmem(void);
@@ -647,7 +655,7 @@ int swsusp_shrink_memory(void)
if (!tmp)
return -ENOMEM;
pages += tmp;
- } else if (size > (IMAGE_SIZE * 1024 * 1024) / PAGE_SIZE) {
+ } else if (size > (image_size * 1024 * 1024) / PAGE_SIZE) {
tmp = shrink_all_memory(SHRINK_BITE);
pages += tmp;
}