The patch titled
grab swap token reordered
has been added to the -mm tree. Its filename is
grab-swap-token-reordered.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: grab swap token reordered
From: Ashwin Chaugule <ashwin.chaugule@xxxxxxxxxxxx>
Make 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@xxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
mm/filemap.c | 1 -
mm/memory.c | 2 +-
2 files changed, 1 insertion(+), 2 deletions(-)
diff -puN mm/filemap.c~grab-swap-token-reordered mm/filemap.c
--- a/mm/filemap.c~grab-swap-token-reordered
+++ a/mm/filemap.c
@@ -1457,7 +1457,6 @@ 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 -puN mm/memory.c~grab-swap-token-reordered mm/memory.c
--- a/mm/memory.c~grab-swap-token-reordered
+++ a/mm/memory.c
@@ -1990,6 +1990,7 @@ 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) {
@@ -2007,7 +2008,6 @@ 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);
_
Patches currently in -mm which might be from ashwin.chaugule@xxxxxxxxxxxx are
grab-swap-token-reordered.patch
new-scheme-to-preempt-swap-token.patch
swap-token-try-to-grab-swap-token-before-the-vm-selects-pages-for-eviction.patch
swap-token-new-scheme-to-preempt-token.patch
swap-token-new-scheme-to-preempt-token-tidy.patch
-
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