You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.4 KiB
44 lines
1.4 KiB
From: Peter Zijlstra <a.p.zijlstra@chello.nl>
|
|
Subject: [PATCH 04/31] mm: tag reseve pages
|
|
Patch-mainline: not yet
|
|
|
|
Tag pages allocated from the reserves with a non-zero page->reserve.
|
|
This allows us to distinguish and account reserve pages.
|
|
|
|
Since low-memory situations are transient, and unrelated the the actual
|
|
page (any page can be on the freelist when we run low), don't mark the
|
|
page in any permanent way - just pass along the information to the
|
|
allocatee.
|
|
|
|
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
|
|
Signed-off-by: Suresh Jayaraman <sjayaraman@suse.de>
|
|
---
|
|
include/linux/mm_types.h | 1 +
|
|
mm/page_alloc.c | 4 +++-
|
|
2 files changed, 4 insertions(+), 1 deletion(-)
|
|
|
|
--- a/include/linux/mm_types.h
|
|
+++ b/include/linux/mm_types.h
|
|
@@ -71,6 +71,7 @@ struct page {
|
|
union {
|
|
pgoff_t index; /* Our offset within mapping. */
|
|
void *freelist; /* SLUB: freelist req. slab lock */
|
|
+ int reserve; /* page_alloc: page is a reserve page */
|
|
};
|
|
struct list_head lru; /* Pageout list, eg. active_list
|
|
* protected by zone->lru_lock !
|
|
--- a/mm/page_alloc.c
|
|
+++ b/mm/page_alloc.c
|
|
@@ -1656,8 +1656,10 @@ zonelist_scan:
|
|
try_this_zone:
|
|
page = buffered_rmqueue(preferred_zone, zone, order,
|
|
gfp_mask, migratetype);
|
|
- if (page)
|
|
+ if (page) {
|
|
+ page->reserve = !!(alloc_flags & ALLOC_NO_WATERMARKS);
|
|
break;
|
|
+ }
|
|
this_zone_full:
|
|
if (NUMA_BUILD)
|
|
zlc_mark_zone_full(zonelist, z);
|