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[PATCH] SwapMig: add_to_swap() avoid atomic allocations 

Add gfp_mask to add_to_swap

add_to_swap does allocations with GFP_ATOMIC in order not to interfere with
swapping.  During migration we may have use add_to_swap extensively which may
lead to out of memory errors.

This patch makes add_to_swap take a parameter that specifies the gfp mask.
The page migration code can then make add_to_swap use GFP_KERNEL.

Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Christoph Lameter 2006-01-08 01:00:53 -08:00 committed by Linus Torvalds
parent 8419c31810
commit 1480a540c9
3 changed files with 5 additions and 5 deletions
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2
include/linux/swap.h
View File

@ -198,7 +198,7 @@ extern int rw_swap_page_sync(int, swp_entry_t, struct page *);
extern struct address_space swapper_space;
#define total_swapcache_pages swapper_space.nrpages
extern void show_swap_cache_info(void);
extern int add_to_swap(struct page *);
extern int add_to_swap(struct page *, gfp_t);
extern void __delete_from_swap_cache(struct page *);
extern void delete_from_swap_cache(struct page *);
extern int move_to_swap_cache(struct page *, swp_entry_t);

4
mm/swap_state.c
View File

@ -141,7 +141,7 @@ void __delete_from_swap_cache(struct page *page)
* Allocate swap space for the page and add the page to the
* swap cache. Caller needs to hold the page lock.
*/
int add_to_swap(struct page * page)
int add_to_swap(struct page * page, gfp_t gfp_mask)
{
swp_entry_t entry;
int err;
@ -166,7 +166,7 @@ int add_to_swap(struct page * page)
* Add it to the swap cache and mark it dirty
*/
err = __add_to_swap_cache(page, entry,
GFP_ATOMIC|__GFP_NOMEMALLOC|__GFP_NOWARN);
gfp_mask|__GFP_NOMEMALLOC|__GFP_NOWARN);
switch (err) {
case 0: /* Success */

4
mm/vmscan.c
View File

@ -458,7 +458,7 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
* Try to allocate it some swap space here.
*/
if (PageAnon(page) && !PageSwapCache(page)) {
if (!add_to_swap(page))
if (!add_to_swap(page, GFP_ATOMIC))
goto activate_locked;
}
#endif /* CONFIG_SWAP */
@ -715,7 +715,7 @@ redo:
}
if (PageAnon(page) && !PageSwapCache(page)) {
if (!add_to_swap(page)) {
if (!add_to_swap(page, GFP_KERNEL)) {
unlock_page(page);
list_move(&page->lru, &failed);
nr_failed++;