Messages in this thread Patch in this message | | | From | "Rafael J. Wysocki" <> | Subject | [RFC/RFT] swsusp: image size tunable (was: Re: [PATCH][mm] swsusp: limit image size) | Date | Sat, 10 Dec 2005 14:21:57 +0100 |
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Hi,
On Friday, 9 December 2005 23:08, Rafael J. Wysocki wrote: }-- snip --{ > > > > > > This would at least give us a chance for a second try. I know that Pavel > > > dislikes userspace tunables, but i dislike failing suspends ;-) > > > > Can we do that when we start seeing failed suspends? I think it will > > not happen. If we have reasonably-sized swap partition, it should be > > ok. > > Yes. Moreover, we can do something like that without a userspace > tunable, if we check for the free swap before we try to shrink memory. > This would take some time to implement, though, and I'd rather > like to do the userland interface first. > > The tunable may be useful to people who'd like to achieve the > maximum efficiency of suspend/resume and it would be a nice > feature to have, I think, but let's say we'll try to implement it > in the future, if still needed/wanted.
Actually the tunable turned out to be quite easy to implement and I think I'll need it for userspace swsusp (the suspend-handling userspace process will need to tell the kernel how much space there is for the image).
Please give it a try.
Greetings, Rafael
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
kernel/power/disk.c | 25 +++++++++++++++++++++++++ kernel/power/power.h | 6 ++++-- kernel/power/swsusp.c | 4 +++- 3 files changed, 32 insertions(+), 3 deletions(-)
Index: linux-2.6.15-rc5-mm1/kernel/power/disk.c =================================================================== --- linux-2.6.15-rc5-mm1.orig/kernel/power/disk.c 2005-12-10 13:12:18.000000000 +0100 +++ linux-2.6.15-rc5-mm1/kernel/power/disk.c 2005-12-10 13:20:38.000000000 +0100 @@ -367,9 +367,34 @@ 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) +{ + int len; + char *p; + unsigned int size; + + p = memchr(buf, '\n', n); + len = p ? p - buf : n; + + if (sscanf(buf, "%u", &size) == 1) { + image_size = size < MAX_IMAGE_SIZE ? size : MAX_IMAGE_SIZE; + return n; + } + + return -EINVAL; +} + +power_attr(image_size); + static struct attribute * g[] = { &disk_attr.attr, &resume_attr.attr, + &image_size_attr.attr, NULL, }; Index: linux-2.6.15-rc5-mm1/kernel/power/power.h =================================================================== --- linux-2.6.15-rc5-mm1.orig/kernel/power/power.h 2005-12-10 13:12:18.000000000 +0100 +++ linux-2.6.15-rc5-mm1/kernel/power/power.h 2005-12-10 13:20:46.000000000 +0100 @@ -53,10 +53,12 @@ extern struct pbe *pagedir_nosave; /* - * Preferred image size in MB (set it to zero to get the smallest + * Maximum image size in MB (set it to zero to get the smallest * image possible) */ -#define IMAGE_SIZE 500 +#define MAX_IMAGE_SIZE 500 + +extern unsigned int image_size; extern asmlinkage int swsusp_arch_suspend(void); extern asmlinkage int swsusp_arch_resume(void); Index: linux-2.6.15-rc5-mm1/kernel/power/swsusp.c =================================================================== --- linux-2.6.15-rc5-mm1.orig/kernel/power/swsusp.c 2005-12-10 13:12:18.000000000 +0100 +++ linux-2.6.15-rc5-mm1/kernel/power/swsusp.c 2005-12-10 13:20:42.000000000 +0100 @@ -69,6 +69,8 @@ #include "power.h" +unsigned int image_size = MAX_IMAGE_SIZE; + #ifdef CONFIG_HIGHMEM unsigned int count_highmem_pages(void); int save_highmem(void); @@ -647,7 +649,7 @@ 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; } - 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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