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[PATCH] swsusp: reduce the use of global variables 

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 2005-10-30 14:59:57 -08:00 committed by Linus Torvalds
parent 25761b6eb7
commit a0f496517f
3 changed files with 43 additions and 43 deletions
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2
kernel/power/power.h
View File

@ -69,4 +69,4 @@ 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 int enough_swap(void);
extern int enough_swap(unsigned nr_pages);

78
kernel/power/snapshot.c
View File

@ -187,37 +187,38 @@ static int saveable(struct zone * zone, unsigned long * zone_pfn)
return 1;
}
static void count_data_pages(void)
static unsigned count_data_pages(void)
{
struct zone *zone;
unsigned long zone_pfn;
unsigned n;
nr_copy_pages = 0;
n = 0;
for_each_zone (zone) {
if (is_highmem(zone))
continue;
mark_free_pages(zone);
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
nr_copy_pages += saveable(zone, &zone_pfn);
n += saveable(zone, &zone_pfn);
}
return n;
}
static void copy_data_pages(void)
static void copy_data_pages(struct pbe *pblist)
{
struct zone *zone;
unsigned long zone_pfn;
struct pbe *pbe = pagedir_nosave, *p;
struct pbe *pbe, *p;
pr_debug("copy_data_pages(): pages to copy: %d\n", nr_copy_pages);
pbe = pblist;
for_each_zone (zone) {
if (is_highmem(zone))
continue;
mark_free_pages(zone);
/* This is necessary for swsusp_free() */
for_each_pb_page (p, pagedir_nosave)
for_each_pb_page (p, pblist)
SetPageNosaveFree(virt_to_page(p));
for_each_pbe(p, pagedir_nosave)
for_each_pbe (p, pblist)
SetPageNosaveFree(virt_to_page(p->address));
for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn) {
if (saveable(zone, &zone_pfn)) {
@ -370,46 +371,39 @@ void swsusp_free(void)
* free pages.
*/
static int enough_free_mem(void)
static int enough_free_mem(unsigned nr_pages)
{
pr_debug("swsusp: available memory: %u pages\n", nr_free_pages());
return nr_free_pages() > (nr_copy_pages + PAGES_FOR_IO +
nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE));
return nr_free_pages() > (nr_pages + PAGES_FOR_IO +
(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
}
static int swsusp_alloc(void)
static struct pbe *swsusp_alloc(unsigned nr_pages)
{
struct pbe * p;
struct pbe *pblist, *p;
pagedir_nosave = NULL;
if (MAX_PBES < nr_copy_pages / PBES_PER_PAGE +
!!(nr_copy_pages % PBES_PER_PAGE))
return -ENOSPC;
if (!(pagedir_save = alloc_pagedir(nr_copy_pages))) {
if (!(pblist = alloc_pagedir(nr_pages))) {
printk(KERN_ERR "suspend: Allocating pagedir failed.\n");
return -ENOMEM;
return NULL;
}
create_pbe_list(pagedir_save, nr_copy_pages);
pagedir_nosave = pagedir_save;
create_pbe_list(pblist, nr_pages);
for_each_pbe (p, pagedir_save) {
for_each_pbe (p, pblist) {
p->address = (unsigned long)alloc_image_page();
if (!p->address) {
printk(KERN_ERR "suspend: Allocating image pages failed.\n");
swsusp_free();
return -ENOMEM;
return NULL;
}
}
return 0;
return pblist;
}
static int suspend_prepare_image(void)
{
int error;
unsigned nr_pages;
pr_debug("swsusp: critical section: \n");
if (save_highmem()) {
@ -419,33 +413,37 @@ static int suspend_prepare_image(void)
}
drain_local_pages();
count_data_pages();
printk("swsusp: Need to copy %u pages\n", nr_copy_pages);
nr_pages = count_data_pages();
printk("swsusp: Need to copy %u pages\n", nr_pages);
pr_debug("swsusp: pages needed: %u + %lu + %u, free: %u\n",
nr_copy_pages,
nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE),
nr_pages,
(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE,
PAGES_FOR_IO, nr_free_pages());
if (!enough_free_mem()) {
/* This is needed because of the fixed size of swsusp_info */
if (MAX_PBES < (nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE)
return -ENOSPC;
if (!enough_free_mem(nr_pages)) {
printk(KERN_ERR "swsusp: Not enough free memory\n");
return -ENOMEM;
}
if (!enough_swap()) {
if (!enough_swap(nr_pages)) {
printk(KERN_ERR "swsusp: Not enough free swap\n");
return -ENOSPC;
}
error = swsusp_alloc();
if (error)
return error;
pagedir_nosave = swsusp_alloc(nr_pages);
if (!pagedir_nosave)
return -ENOMEM;
/* During allocating of suspend pagedir, new cold pages may appear.
* Kill them.
*/
drain_local_pages();
copy_data_pages();
copy_data_pages(pagedir_nosave);
/*
* End of critical section. From now on, we can write to memory,
@ -453,7 +451,9 @@ static int suspend_prepare_image(void)
* touch swap space! Except we must write out our image of course.
*/
printk("swsusp: critical section/: done (%d pages copied)\n", nr_copy_pages );
nr_copy_pages = nr_pages;
printk("swsusp: critical section/: done (%d pages copied)\n", nr_pages);
return 0;
}

6
kernel/power/swsusp.c
View File

@ -550,14 +550,14 @@ static int write_suspend_image(void)
* We should only consider resume_device.
*/
int enough_swap(void)
int enough_swap(unsigned nr_pages)
{
struct sysinfo i;
si_swapinfo(&i);
pr_debug("swsusp: available swap: %lu pages\n", i.freeswap);
return i.freeswap > (nr_copy_pages + PAGES_FOR_IO +
nr_copy_pages/PBES_PER_PAGE + !!(nr_copy_pages%PBES_PER_PAGE));
return i.freeswap > (nr_pages + PAGES_FOR_IO +
(nr_pages + PBES_PER_PAGE - 1) / PBES_PER_PAGE);
}