From: Rafael J. Wysocki <rjw@xxxxxxx>
Subject: 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@xxxxxxx>
Tested-by: M. Vefa Bicakci <bicave@xxxxxxxxxxxxxxx>
---
Documentation/power/interface.txt | 2 +-
kernel/power/main.c | 1 +
kernel/power/power.h | 9 ++++++++-
kernel/power/snapshot.c | 7 ++++++-
4 files changed, 16 insertions(+), 3 deletions(-)
Index: linux-2.6/kernel/power/snapshot.c
===================================================================
--- linux-2.6.orig/kernel/power/snapshot.c
+++ linux-2.6/kernel/power/snapshot.c
@@ -46,7 +46,12 @@ static void swsusp_unset_page_forbidden(
* 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
Index: linux-2.6/kernel/power/power.h
===================================================================
--- linux-2.6.orig/kernel/power/power.h
+++ linux-2.6/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(s
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);
Index: linux-2.6/kernel/power/main.c
===================================================================
--- linux-2.6.orig/kernel/power/main.c
+++ linux-2.6/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;
Index: linux-2.6/Documentation/power/interface.txt
===================================================================
--- linux-2.6.orig/Documentation/power/interface.txt
+++ linux-2.6/Documentation/power/interface.txt
@@ -57,7 +57,7 @@ smallest image possible. In particular,
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
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