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authorRafael J. Wysocki <rjw@sisk.pl>2010-09-20 19:44:56 +0200
committerRafael J. Wysocki <rjw@sisk.pl>2010-10-17 01:57:43 +0200
commitac5c24ec1e983313ef0015258fba6f630e54e7cf (patch)
tree0bd6e99ece68f27b322033fd2ecaea3fa2d9e369
parent266f1a25eff5ff98c498d7754a419aacfd88f71c (diff)
downloadlinux-ac5c24ec1e983313ef0015258fba6f630e54e7cf.tar.bz2
PM / Hibernate: Make default image size depend on total RAM size
The default hibernation image size is currently hard coded and euqal to 500 MB, which is not a reasonable default on many contemporary systems. Make it equal 2/5 of the total RAM size (this is slightly below the maximum, i.e. 1/2 of the total RAM size, and seems to be generally suitable). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Tested-by: M. Vefa Bicakci <bicave@superonline.com>
-rw-r--r--Documentation/power/interface.txt2
-rw-r--r--kernel/power/main.c1
-rw-r--r--kernel/power/power.h9
-rw-r--r--kernel/power/snapshot.c7
4 files changed, 16 insertions, 3 deletions
diff --git a/Documentation/power/interface.txt b/Documentation/power/interface.txt
index e67211fe0ee2..c537834af005 100644
--- a/Documentation/power/interface.txt
+++ b/Documentation/power/interface.txt
@@ -57,7 +57,7 @@ smallest image possible. In particular, if "0" is written to this file, the
suspend image will be as small as possible.
Reading from this file will display the current image size limit, which
-is set to 500 MB by default.
+is set to 2/5 of available RAM by default.
/sys/power/pm_trace controls the code which saves the last PM event point in
the RTC across reboots, so that you can debug a machine that just hangs
diff --git a/kernel/power/main.c b/kernel/power/main.c
index 0a28d4db3597..f06ad6eff37a 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -321,6 +321,7 @@ static int __init pm_init(void)
int error = pm_start_workqueue();
if (error)
return error;
+ hibernate_image_size_init();
power_kobj = kobject_create_and_add("power", NULL);
if (!power_kobj)
return -ENOMEM;
diff --git a/kernel/power/power.h b/kernel/power/power.h
index c7e42e47eb0b..03634be55f62 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -14,6 +14,9 @@ struct swsusp_info {
} __attribute__((aligned(PAGE_SIZE)));
#ifdef CONFIG_HIBERNATION
+/* kernel/power/snapshot.c */
+extern void __init hibernate_image_size_init(void);
+
#ifdef CONFIG_ARCH_HIBERNATION_HEADER
/* Maximum size of architecture specific data in a hibernation header */
#define MAX_ARCH_HEADER_SIZE (sizeof(struct new_utsname) + 4)
@@ -49,7 +52,11 @@ static inline char *check_image_kernel(struct swsusp_info *info)
extern int hibernation_snapshot(int platform_mode);
extern int hibernation_restore(int platform_mode);
extern int hibernation_platform_enter(void);
-#endif
+
+#else /* !CONFIG_HIBERNATION */
+
+static inline void hibernate_image_size_init(void) {}
+#endif /* !CONFIG_HIBERNATION */
extern int pfn_is_nosave(unsigned long);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index d9191b40cf6e..ac7eb109f196 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -46,7 +46,12 @@ static void swsusp_unset_page_forbidden(struct page *);
* size will not exceed N bytes, but if that is impossible, it will
* try to create the smallest image possible.
*/
-unsigned long image_size = 500 * 1024 * 1024;
+unsigned long image_size;
+
+void __init hibernate_image_size_init(void)
+{
+ image_size = ((totalram_pages * 2) / 5) * PAGE_SIZE;
+}
/* List of PBEs needed for restoring the pages that were allocated before
* the suspend and included in the suspend image, but have also been