Subject: + mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug.patch added to -mm tree
To: srivatsa.bhat@xxxxxxxxxxxxxxxxxx,cody@xxxxxxxxxxxxxxxxxx,mel@xxxxxxxxx,minchan@xxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Wed, 24 Jul 2013 15:28:33 -0700
The patch titled
Subject: mm/page_allo.c: restructure free-page stealing code and fix a bug
has been added to the -mm tree. Its filename is
mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug.patch
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From: "Srivatsa S. Bhat" <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Subject: mm/page_allo.c: restructure free-page stealing code and fix a bug
The free-page stealing code in __rmqueue_fallback() is somewhat hard to
follow, and has an incredible amount of subtlety hidden inside!
First off, there is a minor bug in the reporting of change-of-ownership of
pageblocks. Under some conditions, we try to move upto
'pageblock_nr_pages' no. of pages to the preferred allocation list. But
we change the ownership of that pageblock to the preferred type only if we
manage to successfully move atleast half of that pageblock (or if
page_group_by_mobility_disabled is set).
However, the current code ignores the latter part and sets the
'migratetype' variable to the preferred type, irrespective of whether we
actually changed the pageblock migratetype of that block or not. So, the
page_alloc_extfrag tracepoint can end up printing incorrect info (i.e.,
'change_ownership' might be shown as 1 when it must have been 0).
So fixing this involves moving the update of the 'migratetype' variable to
the right place. But looking closer, we observe that the 'migratetype'
variable is used subsequently for checks such as "is_migrate_cma()".
Obviously the intent there is to check if the *fallback* type is
MIGRATE_CMA, but since we already set the 'migratetype' variable to
start_migratetype, we end up checking if the *preferred* type is
MIGRATE_CMA!!
To make things more interesting, this actually doesn't cause a bug in
practice, because we never change *anything* if the fallback type is CMA.
So, restructure the code in such a way that it is trivial to understand
what is going on, and also fix the above mentioned bug. And while at it,
also add a comment explaining the subtlety behind the migratetype used in
the call to expand().
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@xxxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Cody P Schafer <cody@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 96 ++++++++++++++++++++++++++++------------------
1 file changed, 60 insertions(+), 36 deletions(-)
diff -puN mm/page_alloc.c~mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug
+++ a/mm/page_alloc.c
@@ -1008,6 +1008,53 @@ static void change_pageblock_range(struc
}
}
+/*
+ * If breaking a large block of pages, move all free pages to the preferred
+ * allocation list. If falling back for a reclaimable kernel allocation, be
+ * more aggressive about taking ownership of free pages.
+ *
+ * On the other hand, never change migration type of MIGRATE_CMA pageblocks
+ * nor move CMA pages to different free lists. We don't want unmovable pages
+ * to be allocated from MIGRATE_CMA areas.
+ *
+ * Returns the new migratetype of the pageblock (or the same old migratetype
+ * if it was unchanged).
+ */
+static inline int try_to_steal_freepages(struct zone *zone, struct page *page,
+ int start_type, int fallback_type)
+{
+ int current_order = page_order(page);
+
+ if (is_migrate_cma(fallback_type))
+ return fallback_type;
+
+ /* Take ownership for orders >= pageblock_order */
+ if (current_order >= pageblock_order) {
+ change_pageblock_range(page, current_order, start_type);
+ return start_type;
+ }
+
+ if (current_order >= pageblock_order / 2 ||
+ start_type == MIGRATE_RECLAIMABLE ||
+ page_group_by_mobility_disabled) {
+
+ int pages;
+
+ pages = move_freepages_block(zone, page, start_type);
+
+ /* Claim the whole block if over half of it is free */
+ if (pages >= (1 << (pageblock_order-1)) ||
+ page_group_by_mobility_disabled) {
+
+ set_pageblock_migratetype(page, start_type);
+ return start_type;
+ }
+
+ }
+
+ return fallback_type;
+}
+
/* Remove an element from the buddy allocator from the fallback list */
static inline struct page *
__rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
@@ -1015,7 +1062,7 @@ __rmqueue_fallback(struct zone *zone, in
struct free_area *area;
int current_order;
struct page *page;
- int migratetype, i;
+ int migratetype, new_type, i;
/* Find the largest possible block of pages in the other list */
for (current_order = MAX_ORDER-1; current_order >= order;
@@ -1035,51 +1082,28 @@ __rmqueue_fallback(struct zone *zone, in
struct page, lru);
area->nr_free--;
- /*
- * If breaking a large block of pages, move all free
- * pages to the preferred allocation list. If falling
- * back for a reclaimable kernel allocation, be more
- * aggressive about taking ownership of free pages
- *
- * On the other hand, never change migration
- * type of MIGRATE_CMA pageblocks nor move CMA
- * pages on different free lists. We don't
- * want unmovable pages to be allocated from
- * MIGRATE_CMA areas.
- */
- if (!is_migrate_cma(migratetype) &&
- (current_order >= pageblock_order / 2 ||
- start_migratetype == MIGRATE_RECLAIMABLE ||
- page_group_by_mobility_disabled)) {
- int pages;
- pages = move_freepages_block(zone, page,
- start_migratetype);
-
- /* Claim the whole block if over half of it is free */
- if (pages >= (1 << (pageblock_order-1)) ||
- page_group_by_mobility_disabled)
- set_pageblock_migratetype(page,
- start_migratetype);
-
- migratetype = start_migratetype;
- }
+ new_type = try_to_steal_freepages(zone, page,
+ start_migratetype,
+ migratetype);
/* Remove the page from the freelists */
list_del(&page->lru);
rmv_page_order(page);
- /* Take ownership for orders >= pageblock_order */
- if (current_order >= pageblock_order &&
- !is_migrate_cma(migratetype))
- change_pageblock_range(page, current_order,
- start_migratetype);
-
+ /*
+ * Borrow the excess buddy pages as well, irrespective
+ * of whether we stole freepages, or took ownership of
+ * the pageblock or not.
+ *
+ * Exception: When borrowing from MIGRATE_CMA, release
+ * the excess buddy pages to CMA itself.
+ */
expand(zone, page, order, current_order, area,
is_migrate_cma(migratetype)
? migratetype : start_migratetype);
trace_mm_page_alloc_extfrag(page, order, current_order,
- start_migratetype, migratetype);
+ start_migratetype, new_type);
return page;
}
_
Patches currently in -mm which might be from srivatsa.bhat@xxxxxxxxxxxxxxxxxx are
mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug.patch
mm-page_alloc-restructure-free-page-stealing-code-and-fix-a-bug-fix.patch
mm-fix-the-value-of-fallback_migratetype-in-alloc_extfrag-tracepoint.patch
linux-next.patch
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