[PATCH 0/2] PM / Hibernate: Default image size computation and comment fix

[PATCH 0/2] PM / Hibernate: Default image size computation and comment fix

[Rafael J. Wysocki]

Hi,

The following two patches fix a comment in the hibernate memory preallocation
code and make the default image size depend on the total RAM size.  I regard
them as 2.6.37 material.

Please let me know if there are any objections.

Thanks,
Rafael

[PATCH 1/2] PM / Hibernate: Improve comments in hibernate_preallocate_memory()

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@sisk.pl>
Subject: PM / Hibernate: Improve comments in hibernate_preallocate_memory()

One comment in hibernate_preallocate_memory() is wrong, so fix it and
add one more comment to clarify the meaning of the fixed one.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 kernel/power/snapshot.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6/kernel/power/snapshot.c
===================================================================
--- linux-2.6.orig/kernel/power/snapshot.c
+++ linux-2.6/kernel/power/snapshot.c
@@ -1318,12 +1318,14 @@ int hibernate_preallocate_memory(void)
 
 	/* Compute the maximum number of saveable pages to leave in memory. */
 	max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;
+	/* Compute the desired number of image pages specified by image_size. */
 	size = DIV_ROUND_UP(image_size, PAGE_SIZE);
 	if (size > max_size)
 		size = max_size;
 	/*
-	 * If the maximum is not less than the current number of saveable pages
-	 * in memory, allocate page frames for the image and we're done.
+	 * If the desired number of image pages is at least as large as the
+	 * current number of saveable pages in memory, allocate page frames for
+	 * the image and we're done.
 	 */
 	if (size >= saveable) {
 		pages = preallocate_image_highmem(save_highmem);

[PATCH 1/2] PM / Hibernate: Improve comments in hibernate_preallocate_memory()

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@sisk.pl>
Subject: PM / Hibernate: Improve comments in hibernate_preallocate_memory()

One comment in hibernate_preallocate_memory() is wrong, so fix it and
add one more comment to clarify the meaning of the fixed one.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
---
 kernel/power/snapshot.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: linux-2.6/kernel/power/snapshot.c
===================================================================
--- linux-2.6.orig/kernel/power/snapshot.c
+++ linux-2.6/kernel/power/snapshot.c
@@ -1318,12 +1318,14 @@ int hibernate_preallocate_memory(void)
 
 	/* Compute the maximum number of saveable pages to leave in memory. */
 	max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;
+	/* Compute the desired number of image pages specified by image_size. */
 	size = DIV_ROUND_UP(image_size, PAGE_SIZE);
 	if (size > max_size)
 		size = max_size;
 	/*
-	 * If the maximum is not less than the current number of saveable pages
-	 * in memory, allocate page frames for the image and we're done.
+	 * If the desired number of image pages is at least as large as the
+	 * current number of saveable pages in memory, allocate page frames for
+	 * the image and we're done.
 	 */
 	if (size >= saveable) {
 		pages = preallocate_image_highmem(save_highmem);

[PATCH 2/2] PM / Hibernate: Make default image size depend on total RAM size

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@sisk.pl>
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@sisk.pl>
Tested-by: M. Vefa Bicakci <bicave@superonline.com>
---
 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

[PATCH 2/2] PM / Hibernate: Make default image size depend on total RAM size

[Rafael J. Wysocki]

From: Rafael J. Wysocki <rjw@sisk.pl>
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@sisk.pl>
Tested-by: M. Vefa Bicakci <bicave@superonline.com>
---
 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

Re: [PATCH 0/2] PM / Hibernate: Default image size computation and comment fix

[Rafael J. Wysocki]

On Wednesday, September 15, 2010, Rafael J. Wysocki wrote:
> Hi,
> 
> The following two patches fix a comment in the hibernate memory preallocation
> code and make the default image size depend on the total RAM size.  I regard
> them as 2.6.37 material.
> 
> Please let me know if there are any objections.

OK, no response means no objections to me. :-)

I'm putting the two patches in this series into suspend-2.6/linux-next.

Thanks,
Rafael

Re: [PATCH 0/2] PM / Hibernate: Default image size computation and comment fix

[Rafael J. Wysocki]

On Wednesday, September 15, 2010, Rafael J. Wysocki wrote:
> Hi,
> 
> The following two patches fix a comment in the hibernate memory preallocation
> code and make the default image size depend on the total RAM size.  I regard
> them as 2.6.37 material.
> 
> Please let me know if there are any objections.

OK, no response means no objections to me. :-)

I'm putting the two patches in this series into suspend-2.6/linux-next.

Thanks,
Rafael

Re: [PATCH 1/2] PM / Hibernate: Improve comments in hibernate_preallocate_memory()

[Pavel Machek]

On Wed 2010-09-15 00:22:29, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@sisk.pl>
> Subject: PM / Hibernate: Improve comments in hibernate_preallocate_memory()
> 
> One comment in hibernate_preallocate_memory() is wrong, so fix it and
> add one more comment to clarify the meaning of the fixed one.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

ACK.


> ---
>  kernel/power/snapshot.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/kernel/power/snapshot.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/snapshot.c
> +++ linux-2.6/kernel/power/snapshot.c
> @@ -1318,12 +1318,14 @@ int hibernate_preallocate_memory(void)
>  
>  	/* Compute the maximum number of saveable pages to leave in memory. */
>  	max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;
> +	/* Compute the desired number of image pages specified by image_size. */
>  	size = DIV_ROUND_UP(image_size, PAGE_SIZE);
>  	if (size > max_size)
>  		size = max_size;
>  	/*
> -	 * If the maximum is not less than the current number of saveable pages
> -	 * in memory, allocate page frames for the image and we're done.
> +	 * If the desired number of image pages is at least as large as the
> +	 * current number of saveable pages in memory, allocate page frames for
> +	 * the image and we're done.
>  	 */
>  	if (size >= saveable) {
>  		pages = preallocate_image_highmem(save_highmem);
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCH 1/2] PM / Hibernate: Improve comments in hibernate_preallocate_memory()

[Pavel Machek]

On Wed 2010-09-15 00:22:29, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@sisk.pl>
> Subject: PM / Hibernate: Improve comments in hibernate_preallocate_memory()
> 
> One comment in hibernate_preallocate_memory() is wrong, so fix it and
> add one more comment to clarify the meaning of the fixed one.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

ACK.


> ---
>  kernel/power/snapshot.c |    6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> Index: linux-2.6/kernel/power/snapshot.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/snapshot.c
> +++ linux-2.6/kernel/power/snapshot.c
> @@ -1318,12 +1318,14 @@ int hibernate_preallocate_memory(void)
>  
>  	/* Compute the maximum number of saveable pages to leave in memory. */
>  	max_size = (count - (size + PAGES_FOR_IO)) / 2 - 2 * SPARE_PAGES;
> +	/* Compute the desired number of image pages specified by image_size. */
>  	size = DIV_ROUND_UP(image_size, PAGE_SIZE);
>  	if (size > max_size)
>  		size = max_size;
>  	/*
> -	 * If the maximum is not less than the current number of saveable pages
> -	 * in memory, allocate page frames for the image and we're done.
> +	 * If the desired number of image pages is at least as large as the
> +	 * current number of saveable pages in memory, allocate page frames for
> +	 * the image and we're done.
>  	 */
>  	if (size >= saveable) {
>  		pages = preallocate_image_highmem(save_highmem);
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCH 2/2] PM / Hibernate: Make default image size depend on total RAM size

[Pavel Machek]

Hi!

> From: Rafael J. Wysocki <rjw@sisk.pl>
> 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).

I do not think I agree here.

Making limit say 1GB may be good idea, but by making it 2/5 of RAM you
essentialy make it useless -- 40% RAM is very similar to 50% RAM.

I have box with lot of memory and old distro -- it mostly uses RAM for
cache. Now you have made my suspend/resume 6 times slower... And when I
add more memory to the machine, it will slow down even further.

								Pavel




> ---
>  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
> 
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/

-- 
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(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

Re: [PATCH 2/2] PM / Hibernate: Make default image size depend on total RAM size

[Pavel Machek]

Hi!

> From: Rafael J. Wysocki <rjw@sisk.pl>
> 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).

I do not think I agree here.

Making limit say 1GB may be good idea, but by making it 2/5 of RAM you
essentialy make it useless -- 40% RAM is very similar to 50% RAM.

I have box with lot of memory and old distro -- it mostly uses RAM for
cache. Now you have made my suspend/resume 6 times slower... And when I
add more memory to the machine, it will slow down even further.

								Pavel




> ---
>  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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