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Subject[PATCH v2] mm: add free_hot_cold_page_list helper
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This patch adds helper free_hot_cold_page_list() to free list of 0-order pages.
It frees pages directly from the list without temporary page-vector.
It also calls trace_mm_pagevec_free() to simulate pagevec_free() behaviour.

bloat-o-meter:

add/remove: 1/1 grow/shrink: 1/3 up/down: 267/-295 (-28)
function old new delta
free_hot_cold_page_list - 264 +264
get_page_from_freelist 2129 2132 +3
__pagevec_free 243 239 -4
split_free_page 380 373 -7
release_pages 606 510 -96
free_page_list 188 - -188

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
---
include/linux/gfp.h | 1 +
mm/page_alloc.c | 13 +++++++++++++
mm/swap.c | 14 +++-----------
mm/vmscan.c | 20 +-------------------
4 files changed, 18 insertions(+), 30 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 3a76faf..6562958 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -358,6 +358,7 @@ void *alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask);
extern void __free_pages(struct page *page, unsigned int order);
extern void free_pages(unsigned long addr, unsigned int order);
extern void free_hot_cold_page(struct page *page, int cold);
+extern void free_hot_cold_page_list(struct list_head *list, int cold);

#define __free_page(page) __free_pages((page), 0)
#define free_page(addr) free_pages((addr), 0)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 9dd443d..5093114 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1211,6 +1211,19 @@ out:
}

/*
+ * Free a list of 0-order pages
+ */
+void free_hot_cold_page_list(struct list_head *list, int cold)
+{
+ struct page *page, *next;
+
+ list_for_each_entry_safe(page, next, list, lru) {
+ trace_mm_pagevec_free(page, cold);
+ free_hot_cold_page(page, cold);
+ }
+}
+
+/*
* split_page takes a non-compound higher-order page, and splits it into
* n (1<<order) sub-pages: page[0..n]
* Each sub-page must be freed individually.
diff --git a/mm/swap.c b/mm/swap.c
index 3a442f1..b9138c7 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -562,11 +562,10 @@ int lru_add_drain_all(void)
void release_pages(struct page **pages, int nr, int cold)
{
int i;
- struct pagevec pages_to_free;
+ LIST_HEAD(pages_to_free);
struct zone *zone = NULL;
unsigned long uninitialized_var(flags);

- pagevec_init(&pages_to_free, cold);
for (i = 0; i < nr; i++) {
struct page *page = pages[i];

@@ -597,19 +596,12 @@ void release_pages(struct page **pages, int nr, int cold)
del_page_from_lru(zone, page);
}

- if (!pagevec_add(&pages_to_free, page)) {
- if (zone) {
- spin_unlock_irqrestore(&zone->lru_lock, flags);
- zone = NULL;
- }
- __pagevec_free(&pages_to_free);
- pagevec_reinit(&pages_to_free);
- }
+ list_add_tail(&page->lru, &pages_to_free);
}
if (zone)
spin_unlock_irqrestore(&zone->lru_lock, flags);

- pagevec_free(&pages_to_free);
+ free_hot_cold_page_list(&pages_to_free, cold);
}
EXPORT_SYMBOL(release_pages);

diff --git a/mm/vmscan.c b/mm/vmscan.c
index a90c603..77f84ef 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -728,24 +728,6 @@ static enum page_references page_check_references(struct page *page,
return PAGEREF_RECLAIM;
}

-static noinline_for_stack void free_page_list(struct list_head *free_pages)
-{
- struct pagevec freed_pvec;
- struct page *page, *tmp;
-
- pagevec_init(&freed_pvec, 1);
-
- list_for_each_entry_safe(page, tmp, free_pages, lru) {
- list_del(&page->lru);
- if (!pagevec_add(&freed_pvec, page)) {
- __pagevec_free(&freed_pvec);
- pagevec_reinit(&freed_pvec);
- }
- }
-
- pagevec_free(&freed_pvec);
-}
-
/*
* shrink_page_list() returns the number of reclaimed pages
*/
@@ -1009,7 +991,7 @@ keep_lumpy:
if (nr_dirty && nr_dirty == nr_congested && scanning_global_lru(sc))
zone_set_flag(zone, ZONE_CONGESTED);

- free_page_list(&free_pages);
+ free_hot_cold_page_list(&free_pages, 1);

list_splice(&ret_pages, page_list);
count_vm_events(PGACTIVATE, pgactivate);


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