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Subject[RFC][PATCH 1/2] grab swap token reordered
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Date

This patch makes sure the contention for the token happens _before_ any
read-in and kicks the swap-token algo only when the VM is under
pressure.



Signed-off-by: Ashwin Chaugule <ashwin.chaugule@celunite.com>

--
diff --git a/mm/filemap.c b/mm/filemap.c
index afcdc72..c17b2ab 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1479,7 +1479,6 @@ no_cached_page:
* effect.
*/
error = page_cache_read(file, pgoff);
- grab_swap_token();

/*
* The page we want has now been added to the page cache.
diff --git a/mm/memory.c b/mm/memory.c
index 92a3ebd..4a877e9 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1974,6 +1974,7 @@ static int do_swap_page(struct mm_struct
delayacct_set_flag(DELAYACCT_PF_SWAPIN);
page = lookup_swap_cache(entry);
if (!page) {
+ grab_swap_token(); /* Contend for token _before_ read-in */
swapin_readahead(entry, address, vma);
page = read_swap_cache_async(entry, vma, address);
if (!page) {
@@ -1991,7 +1992,6 @@ static int do_swap_page(struct mm_struct
/* Had to read the page from swap area: Major fault */
ret = VM_FAULT_MAJOR;
count_vm_event(PGMAJFAULT);
- grab_swap_token();
}

delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
--
-
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