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-rw-r--r--kernel/power/disk.c30
-rw-r--r--kernel/power/power.h14
-rw-r--r--kernel/power/snapshot.c65
-rw-r--r--kernel/power/swsusp.c52
4 files changed, 125 insertions, 36 deletions
diff --git a/kernel/power/disk.c b/kernel/power/disk.c
index 76a5131b0e8..9e51cdf7b78 100644
--- a/kernel/power/disk.c
+++ b/kernel/power/disk.c
@@ -24,6 +24,7 @@
extern suspend_disk_method_t pm_disk_mode;
+extern int swsusp_shrink_memory(void);
extern int swsusp_suspend(void);
extern int swsusp_write(struct pbe *pblist, unsigned int nr_pages);
extern int swsusp_check(void);
@@ -73,31 +74,6 @@ static void power_down(suspend_disk_method_t mode)
static int in_suspend __nosavedata = 0;
-/**
- * free_some_memory - Try to free as much memory as possible
- *
- * ... but do not OOM-kill anyone
- *
- * Notice: all userland should be stopped at this point, or
- * livelock is possible.
- */
-
-static void free_some_memory(void)
-{
- unsigned int i = 0;
- unsigned int tmp;
- unsigned long pages = 0;
- char *p = "-\\|/";
-
- printk("Freeing memory... ");
- while ((tmp = shrink_all_memory(10000))) {
- pages += tmp;
- printk("\b%c", p[i++ % 4]);
- }
- printk("\bdone (%li pages freed)\n", pages);
-}
-
-
static inline void platform_finish(void)
{
if (pm_disk_mode == PM_DISK_PLATFORM) {
@@ -127,8 +103,8 @@ static int prepare_processes(void)
}
/* Free memory before shutting down devices. */
- free_some_memory();
- return 0;
+ if (!(error = swsusp_shrink_memory()))
+ return 0;
thaw:
thaw_processes();
enable_nonboot_cpus();
diff --git a/kernel/power/power.h b/kernel/power/power.h
index 977877c6dcf..acdc83b3d89 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -49,18 +49,26 @@ extern void thaw_processes(void);
extern int pm_prepare_console(void);
extern void pm_restore_console(void);
-
/* References to section boundaries */
extern const void __nosave_begin, __nosave_end;
extern unsigned int nr_copy_pages;
-extern suspend_pagedir_t *pagedir_nosave;
-extern suspend_pagedir_t *pagedir_save;
+extern struct pbe *pagedir_nosave;
+
+/*
+ * This compilation switch determines the way in which memory will be freed
+ * during suspend. If defined, only as much memory will be freed as needed
+ * to complete the suspend, which will make it go faster. Otherwise, the
+ * largest possible amount of memory will be freed.
+ */
+#define FAST_FREE 1
extern asmlinkage int swsusp_arch_suspend(void);
extern asmlinkage int swsusp_arch_resume(void);
+extern unsigned int count_data_pages(void);
extern void free_pagedir(struct pbe *pblist);
+extern void release_eaten_pages(void);
extern struct pbe *alloc_pagedir(unsigned nr_pages, gfp_t gfp_mask, int safe_needed);
extern void swsusp_free(void);
extern int alloc_data_pages(struct pbe *pblist, gfp_t gfp_mask, int safe_needed);
diff --git a/kernel/power/snapshot.c b/kernel/power/snapshot.c
index 152d56cdf01..e80d282dbf5 100644
--- a/kernel/power/snapshot.c
+++ b/kernel/power/snapshot.c
@@ -37,6 +37,31 @@ struct pbe *pagedir_nosave;
unsigned int nr_copy_pages;
#ifdef CONFIG_HIGHMEM
+unsigned int count_highmem_pages(void)
+{
+ struct zone *zone;
+ unsigned long zone_pfn;
+ unsigned int n = 0;
+
+ for_each_zone (zone)
+ if (is_highmem(zone)) {
+ mark_free_pages(zone);
+ for (zone_pfn = 0; zone_pfn < zone->spanned_pages; zone_pfn++) {
+ struct page *page;
+ unsigned long pfn = zone_pfn + zone->zone_start_pfn;
+ if (!pfn_valid(pfn))
+ continue;
+ page = pfn_to_page(pfn);
+ if (PageReserved(page))
+ continue;
+ if (PageNosaveFree(page))
+ continue;
+ n++;
+ }
+ }
+ return n;
+}
+
struct highmem_page {
char *data;
struct page *page;
@@ -152,17 +177,15 @@ static int saveable(struct zone *zone, unsigned long *zone_pfn)
BUG_ON(PageReserved(page) && PageNosave(page));
if (PageNosave(page))
return 0;
- if (PageReserved(page) && pfn_is_nosave(pfn)) {
- pr_debug("[nosave pfn 0x%lx]", pfn);
+ if (PageReserved(page) && pfn_is_nosave(pfn))
return 0;
- }
if (PageNosaveFree(page))
return 0;
return 1;
}
-static unsigned count_data_pages(void)
+unsigned int count_data_pages(void)
{
struct zone *zone;
unsigned long zone_pfn;
@@ -267,6 +290,35 @@ static inline void create_pbe_list(struct pbe *pblist, unsigned int nr_pages)
}
/**
+ * On resume it is necessary to trace and eventually free the unsafe
+ * pages that have been allocated, because they are needed for I/O
+ * (on x86-64 we likely will "eat" these pages once again while
+ * creating the temporary page translation tables)
+ */
+
+struct eaten_page {
+ struct eaten_page *next;
+ char padding[PAGE_SIZE - sizeof(void *)];
+};
+
+static struct eaten_page *eaten_pages = NULL;
+
+void release_eaten_pages(void)
+{
+ struct eaten_page *p, *q;
+
+ p = eaten_pages;
+ while (p) {
+ q = p->next;
+ /* We don't want swsusp_free() to free this page again */
+ ClearPageNosave(virt_to_page(p));
+ free_page((unsigned long)p);
+ p = q;
+ }
+ eaten_pages = NULL;
+}
+
+/**
* @safe_needed - on resume, for storing the PBE list and the image,
* we can only use memory pages that do not conflict with the pages
* which had been used before suspend.
@@ -284,9 +336,12 @@ static inline void *alloc_image_page(gfp_t gfp_mask, int safe_needed)
if (safe_needed)
do {
res = (void *)get_zeroed_page(gfp_mask);
- if (res && PageNosaveFree(virt_to_page(res)))
+ if (res && PageNosaveFree(virt_to_page(res))) {
/* This is for swsusp_free() */
SetPageNosave(virt_to_page(res));
+ ((struct eaten_page *)res)->next = eaten_pages;
+ eaten_pages = res;
+ }
} while (res && PageNosaveFree(virt_to_page(res)));
else
res = (void *)get_zeroed_page(gfp_mask);
diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c
index b09bd7c0998..f77f9397a36 100644
--- a/kernel/power/swsusp.c
+++ b/kernel/power/swsusp.c
@@ -70,11 +70,13 @@
#include "power.h"
#ifdef CONFIG_HIGHMEM
+unsigned int count_highmem_pages(void);
int save_highmem(void);
int restore_highmem(void);
#else
static int save_highmem(void) { return 0; }
static int restore_highmem(void) { return 0; }
+static unsigned int count_highmem_pages(void) { return 0; }
#endif
extern char resume_file[];
@@ -611,6 +613,52 @@ int swsusp_write(struct pbe *pblist, unsigned int nr_pages)
return error;
}
+/**
+ * swsusp_shrink_memory - Try to free as much memory as needed
+ *
+ * ... but do not OOM-kill anyone
+ *
+ * Notice: all userland should be stopped before it is called, or
+ * livelock is possible.
+ */
+
+#define SHRINK_BITE 10000
+
+int swsusp_shrink_memory(void)
+{
+ long tmp;
+ struct zone *zone;
+ unsigned long pages = 0;
+ unsigned int i = 0;
+ char *p = "-\\|/";
+
+ printk("Shrinking memory... ");
+ do {
+#ifdef FAST_FREE
+ tmp = 2 * count_highmem_pages();
+ tmp += tmp / 50 + count_data_pages();
+ tmp += (tmp + PBES_PER_PAGE - 1) / PBES_PER_PAGE +
+ PAGES_FOR_IO;
+ for_each_zone (zone)
+ if (!is_highmem(zone))
+ tmp -= zone->free_pages;
+ if (tmp > 0) {
+ tmp = shrink_all_memory(SHRINK_BITE);
+ if (!tmp)
+ return -ENOMEM;
+ pages += tmp;
+ }
+#else
+ tmp = shrink_all_memory(SHRINK_BITE);
+ pages += tmp;
+#endif
+ printk("\b%c", p[i++%4]);
+ } while (tmp > 0);
+ printk("\bdone (%lu pages freed)\n", pages);
+
+ return 0;
+}
+
int swsusp_suspend(void)
{
int error;
@@ -1030,8 +1078,10 @@ static int read_suspend_image(struct pbe **pblist_ptr)
/* Allocate memory for the image and read the data from swap */
if (!error)
error = alloc_data_pages(pblist, GFP_ATOMIC, 1);
- if (!error)
+ if (!error) {
+ release_eaten_pages();
error = load_image_data(pblist, &handle, nr_pages);
+ }
if (!error)
*pblist_ptr = pblist;
}