forked from luck/tmp_suning_uos_patched
[PATCH] swsusp: rework memory freeing on resume
The following patch makes swsusp use the PG_nosave and PG_nosave_free flags to mark pages that should be freed in case of an error during resume. This allows us to simplify the code and to use swsusp_free() in all of the swsusp's resume error paths, which makes them actually work. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Rafael J. Wysocki
Linus Torvalds
parent
a0f496517f
commit
2c1b4a5ca4
|
|
@ -147,57 +147,7 @@ extern int restore_image(void);
|
|||
|
||||
pgd_t *temp_level4_pgt;
|
||||
|
||||
static void **pages;
|
||||
|
||||
static inline void *__add_page(void)
|
||||
{
|
||||
void **c;
|
||||
|
||||
c = (void **)get_usable_page(GFP_ATOMIC);
|
||||
if (c) {
|
||||
*c = pages;
|
||||
pages = c;
|
||||
}
|
||||
return c;
|
||||
}
|
||||
|
||||
static inline void *__next_page(void)
|
||||
{
|
||||
void **c;
|
||||
|
||||
c = pages;
|
||||
if (c) {
|
||||
pages = *c;
|
||||
*c = NULL;
|
||||
}
|
||||
return c;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to allocate as many usable pages as needed and daisy chain them.
|
||||
* If one allocation fails, free the pages allocated so far
|
||||
*/
|
||||
static int alloc_usable_pages(unsigned long n)
|
||||
{
|
||||
void *p;
|
||||
|
||||
pages = NULL;
|
||||
do
|
||||
if (!__add_page())
|
||||
break;
|
||||
while (--n);
|
||||
if (n) {
|
||||
p = __next_page();
|
||||
while (p) {
|
||||
free_page((unsigned long)p);
|
||||
p = __next_page();
|
||||
}
|
||||
return -ENOMEM;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
|
||||
static int res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long end)
|
||||
{
|
||||
long i, j;
|
||||
|
||||
|
|
@ -211,7 +161,9 @@ static void res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long e
|
|||
if (paddr >= end)
|
||||
break;
|
||||
|
||||
pmd = (pmd_t *)__next_page();
|
||||
pmd = (pmd_t *)get_safe_page(GFP_ATOMIC);
|
||||
if (!pmd)
|
||||
return -ENOMEM;
|
||||
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
|
||||
for (j = 0; j < PTRS_PER_PMD; pmd++, j++, paddr += PMD_SIZE) {
|
||||
unsigned long pe;
|
||||
|
|
@ -223,13 +175,17 @@ static void res_phys_pud_init(pud_t *pud, unsigned long address, unsigned long e
|
|||
set_pmd(pmd, __pmd(pe));
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void set_up_temporary_mappings(void)
|
||||
static int set_up_temporary_mappings(void)
|
||||
{
|
||||
unsigned long start, end, next;
|
||||
int error;
|
||||
|
||||
temp_level4_pgt = (pgd_t *)__next_page();
|
||||
temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC);
|
||||
if (!temp_level4_pgt)
|
||||
return -ENOMEM;
|
||||
|
||||
/* It is safe to reuse the original kernel mapping */
|
||||
set_pgd(temp_level4_pgt + pgd_index(__START_KERNEL_map),
|
||||
|
|
@ -240,29 +196,27 @@ static void set_up_temporary_mappings(void)
|
|||
end = (unsigned long)pfn_to_kaddr(end_pfn);
|
||||
|
||||
for (; start < end; start = next) {
|
||||
pud_t *pud = (pud_t *)__next_page();
|
||||
pud_t *pud = (pud_t *)get_safe_page(GFP_ATOMIC);
|
||||
if (!pud)
|
||||
return -ENOMEM;
|
||||
next = start + PGDIR_SIZE;
|
||||
if (next > end)
|
||||
next = end;
|
||||
res_phys_pud_init(pud, __pa(start), __pa(next));
|
||||
if ((error = res_phys_pud_init(pud, __pa(start), __pa(next))))
|
||||
return error;
|
||||
set_pgd(temp_level4_pgt + pgd_index(start),
|
||||
mk_kernel_pgd(__pa(pud)));
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
int swsusp_arch_resume(void)
|
||||
{
|
||||
unsigned long n;
|
||||
int error;
|
||||
|
||||
n = ((end_pfn << PAGE_SHIFT) + PUD_SIZE - 1) >> PUD_SHIFT;
|
||||
n += (n + PTRS_PER_PUD - 1) / PTRS_PER_PUD + 1;
|
||||
pr_debug("swsusp_arch_resume(): pages needed = %lu\n", n);
|
||||
if (alloc_usable_pages(n)) {
|
||||
free_eaten_memory();
|
||||
return -ENOMEM;
|
||||
}
|
||||
/* We have got enough memory and from now on we cannot recover */
|
||||
set_up_temporary_mappings();
|
||||
if ((error = set_up_temporary_mappings()))
|
||||
return error;
|
||||
restore_image();
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -71,8 +71,7 @@ void restore_processor_state(void);
|
|||
struct saved_context;
|
||||
void __save_processor_state(struct saved_context *ctxt);
|
||||
void __restore_processor_state(struct saved_context *ctxt);
|
||||
extern unsigned long get_usable_page(gfp_t gfp_mask);
|
||||
extern void free_eaten_memory(void);
|
||||
unsigned long get_safe_page(gfp_t gfp_mask);
|
||||
|
||||
/*
|
||||
* XXX: We try to keep some more pages free so that I/O operations succeed
|
||||
|
|
|
|||
|
|
@ -30,7 +30,6 @@ extern int swsusp_check(void);
|
|||
extern int swsusp_read(void);
|
||||
extern void swsusp_close(void);
|
||||
extern int swsusp_resume(void);
|
||||
extern int swsusp_free(void);
|
||||
|
||||
|
||||
static int noresume = 0;
|
||||
|
|
@ -252,14 +251,17 @@ static int software_resume(void)
|
|||
|
||||
pr_debug("PM: Reading swsusp image.\n");
|
||||
|
||||
if ((error = swsusp_read()))
|
||||
goto Cleanup;
|
||||
if ((error = swsusp_read())) {
|
||||
swsusp_free();
|
||||
goto Thaw;
|
||||
}
|
||||
|
||||
pr_debug("PM: Preparing devices for restore.\n");
|
||||
|
||||
if ((error = device_suspend(PMSG_FREEZE))) {
|
||||
printk("Some devices failed to suspend\n");
|
||||
goto Free;
|
||||
swsusp_free();
|
||||
goto Thaw;
|
||||
}
|
||||
|
||||
mb();
|
||||
|
|
@ -268,9 +270,7 @@ static int software_resume(void)
|
|||
swsusp_resume();
|
||||
pr_debug("PM: Restore failed, recovering.n");
|
||||
device_resume();
|
||||
Free:
|
||||
swsusp_free();
|
||||
Cleanup:
|
||||
Thaw:
|
||||
unprepare_processes();
|
||||
Done:
|
||||
/* For success case, the suspend path will release the lock */
|
||||
|
|
|
|||
|
|
@ -66,7 +66,7 @@ extern asmlinkage int swsusp_arch_suspend(void);
|
|||
extern asmlinkage int swsusp_arch_resume(void);
|
||||
|
||||
extern int restore_highmem(void);
|
||||
extern void free_pagedir(struct pbe *pblist);
|
||||
extern struct pbe * alloc_pagedir(unsigned nr_pages);
|
||||
extern void create_pbe_list(struct pbe *pblist, unsigned nr_pages);
|
||||
extern void swsusp_free(void);
|
||||
extern int enough_swap(unsigned nr_pages);
|
||||
|
|
|
|||
|
|
@ -240,7 +240,7 @@ static void copy_data_pages(struct pbe *pblist)
|
|||
* free_pagedir - free pages allocated with alloc_pagedir()
|
||||
*/
|
||||
|
||||
void free_pagedir(struct pbe *pblist)
|
||||
static void free_pagedir(struct pbe *pblist)
|
||||
{
|
||||
struct pbe *pbe;
|
||||
|
||||
|
|
|
|||
|
|
@ -629,6 +629,11 @@ int swsusp_resume(void)
|
|||
* execution continues at place where swsusp_arch_suspend was called
|
||||
*/
|
||||
BUG_ON(!error);
|
||||
/* The only reason why swsusp_arch_resume() can fail is memory being
|
||||
* very tight, so we have to free it as soon as we can to avoid
|
||||
* subsequent failures
|
||||
*/
|
||||
swsusp_free();
|
||||
restore_processor_state();
|
||||
restore_highmem();
|
||||
touch_softlockup_watchdog();
|
||||
|
|
@ -644,54 +649,28 @@ int swsusp_resume(void)
|
|||
*
|
||||
* We don't know which pages are usable until we allocate them.
|
||||
*
|
||||
* Allocated but unusable (ie eaten) memory pages are linked together
|
||||
* to create a list, so that we can free them easily
|
||||
*
|
||||
* We could have used a type other than (void *)
|
||||
* for this purpose, but ...
|
||||
* Allocated but unusable (ie eaten) memory pages are marked so that
|
||||
* swsusp_free() can release them
|
||||
*/
|
||||
static void **eaten_memory = NULL;
|
||||
|
||||
static inline void eat_page(void *page)
|
||||
{
|
||||
void **c;
|
||||
|
||||
c = eaten_memory;
|
||||
eaten_memory = page;
|
||||
*eaten_memory = c;
|
||||
}
|
||||
|
||||
unsigned long get_usable_page(gfp_t gfp_mask)
|
||||
unsigned long get_safe_page(gfp_t gfp_mask)
|
||||
{
|
||||
unsigned long m;
|
||||
|
||||
m = get_zeroed_page(gfp_mask);
|
||||
while (!PageNosaveFree(virt_to_page(m))) {
|
||||
eat_page((void *)m);
|
||||
do {
|
||||
m = get_zeroed_page(gfp_mask);
|
||||
if (!m)
|
||||
break;
|
||||
if (m && PageNosaveFree(virt_to_page(m)))
|
||||
/* This is for swsusp_free() */
|
||||
SetPageNosave(virt_to_page(m));
|
||||
} while (m && PageNosaveFree(virt_to_page(m)));
|
||||
if (m) {
|
||||
/* This is for swsusp_free() */
|
||||
SetPageNosave(virt_to_page(m));
|
||||
SetPageNosaveFree(virt_to_page(m));
|
||||
}
|
||||
return m;
|
||||
}
|
||||
|
||||
void free_eaten_memory(void)
|
||||
{
|
||||
unsigned long m;
|
||||
void **c;
|
||||
int i = 0;
|
||||
|
||||
c = eaten_memory;
|
||||
while (c) {
|
||||
m = (unsigned long)c;
|
||||
c = *c;
|
||||
free_page(m);
|
||||
i++;
|
||||
}
|
||||
eaten_memory = NULL;
|
||||
pr_debug("swsusp: %d unused pages freed\n", i);
|
||||
}
|
||||
|
||||
/**
|
||||
* check_pagedir - We ensure here that pages that the PBEs point to
|
||||
* won't collide with pages where we're going to restore from the loaded
|
||||
|
|
@ -709,7 +688,7 @@ static int check_pagedir(struct pbe *pblist)
|
|||
p->address = 0UL;
|
||||
|
||||
for_each_pbe (p, pblist) {
|
||||
p->address = get_usable_page(GFP_ATOMIC);
|
||||
p->address = get_safe_page(GFP_ATOMIC);
|
||||
if (!p->address)
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
|
@ -728,7 +707,7 @@ static struct pbe * swsusp_pagedir_relocate(struct pbe *pblist)
|
|||
unsigned long zone_pfn;
|
||||
struct pbe *pbpage, *tail, *p;
|
||||
void *m;
|
||||
int rel = 0, error = 0;
|
||||
int rel = 0;
|
||||
|
||||
if (!pblist) /* a sanity check */
|
||||
return NULL;
|
||||
|
|
@ -736,41 +715,37 @@ static struct pbe * swsusp_pagedir_relocate(struct pbe *pblist)
|
|||
pr_debug("swsusp: Relocating pagedir (%lu pages to check)\n",
|
||||
swsusp_info.pagedir_pages);
|
||||
|
||||
/* Set page flags */
|
||||
/* Clear page flags */
|
||||
|
||||
for_each_zone (zone) {
|
||||
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
|
||||
SetPageNosaveFree(pfn_to_page(zone_pfn +
|
||||
if (pfn_valid(zone_pfn + zone->zone_start_pfn))
|
||||
ClearPageNosaveFree(pfn_to_page(zone_pfn +
|
||||
zone->zone_start_pfn));
|
||||
}
|
||||
|
||||
/* Clear orig addresses */
|
||||
/* Mark orig addresses */
|
||||
|
||||
for_each_pbe (p, pblist)
|
||||
ClearPageNosaveFree(virt_to_page(p->orig_address));
|
||||
SetPageNosaveFree(virt_to_page(p->orig_address));
|
||||
|
||||
tail = pblist + PB_PAGE_SKIP;
|
||||
|
||||
/* Relocate colliding pages */
|
||||
|
||||
for_each_pb_page (pbpage, pblist) {
|
||||
if (!PageNosaveFree(virt_to_page((unsigned long)pbpage))) {
|
||||
m = (void *)get_usable_page(GFP_ATOMIC | __GFP_COLD);
|
||||
if (!m) {
|
||||
error = -ENOMEM;
|
||||
break;
|
||||
}
|
||||
if (PageNosaveFree(virt_to_page((unsigned long)pbpage))) {
|
||||
m = (void *)get_safe_page(GFP_ATOMIC | __GFP_COLD);
|
||||
if (!m)
|
||||
return NULL;
|
||||
memcpy(m, (void *)pbpage, PAGE_SIZE);
|
||||
if (pbpage == pblist)
|
||||
pblist = (struct pbe *)m;
|
||||
else
|
||||
tail->next = (struct pbe *)m;
|
||||
|
||||
eat_page((void *)pbpage);
|
||||
pbpage = (struct pbe *)m;
|
||||
|
||||
/* We have to link the PBEs again */
|
||||
|
||||
for (p = pbpage; p < pbpage + PB_PAGE_SKIP; p++)
|
||||
if (p->next) /* needed to save the end */
|
||||
p->next = p + 1;
|
||||
|
|
@ -780,15 +755,13 @@ static struct pbe * swsusp_pagedir_relocate(struct pbe *pblist)
|
|||
tail = pbpage + PB_PAGE_SKIP;
|
||||
}
|
||||
|
||||
if (error) {
|
||||
printk("\nswsusp: Out of memory\n\n");
|
||||
free_pagedir(pblist);
|
||||
free_eaten_memory();
|
||||
pblist = NULL;
|
||||
/* Is this even worth handling? It should never ever happen, and we
|
||||
have just lost user's state, anyway... */
|
||||
} else
|
||||
printk("swsusp: Relocated %d pages\n", rel);
|
||||
/* This is for swsusp_free() */
|
||||
for_each_pb_page (pbpage, pblist) {
|
||||
SetPageNosave(virt_to_page(pbpage));
|
||||
SetPageNosaveFree(virt_to_page(pbpage));
|
||||
}
|
||||
|
||||
printk("swsusp: Relocated %d pages\n", rel);
|
||||
|
||||
return pblist;
|
||||
}
|
||||
|
|
@ -1006,9 +979,7 @@ static int read_pagedir(struct pbe *pblist)
|
|||
break;
|
||||
}
|
||||
|
||||
if (error)
|
||||
free_pagedir(pblist);
|
||||
else
|
||||
if (!error)
|
||||
BUG_ON(i != swsusp_info.pagedir_pages);
|
||||
|
||||
return error;
|
||||
|
|
@ -1051,15 +1022,6 @@ static int read_suspend_image(void)
|
|||
if (!error)
|
||||
error = data_read(pagedir_nosave);
|
||||
|
||||
if (error) { /* We fail cleanly */
|
||||
free_eaten_memory();
|
||||
for_each_pbe (p, pagedir_nosave)
|
||||
if (p->address) {
|
||||
free_page(p->address);
|
||||
p->address = 0UL;
|
||||
}
|
||||
free_pagedir(pagedir_nosave);
|
||||
}
|
||||
return error;
|
||||
}
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user