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While page-cache's charge/uncharge is done under page_lock(), swap-cache
isn't. (anonymous page is charged when it's newly allocated.)
This patch moves do_swap_page()'s charge() call under lock. This helps
us to avoid to charge already mapped one, unnecessary calls.
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
mm/memory.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
Index: mmotm-2.6.27-rc7+/mm/memory.c
===================================================================
--- mmotm-2.6.27-rc7+.orig/mm/memory.c
+++ mmotm-2.6.27-rc7+/mm/memory.c
@@ -2320,15 +2320,14 @@ static int do_swap_page(struct mm_struct
count_vm_event(PGMAJFAULT);
}
+ lock_page(page);
+ delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
+
if (mem_cgroup_charge(page, mm, GFP_KERNEL)) {
- delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
ret = VM_FAULT_OOM;
goto out;
}
-
mark_page_accessed(page);
- lock_page(page);
- delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
/*
* Back out if somebody else already faulted in this pte.
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