This patch adds helper free_hot_cold_page_list() to free list of 0-order pages.
It frees pages directly from 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 <redacted>
---
 include/linux/gfp.h |    1 +
 mm/page_alloc.c     |   12 ++++++++++++
 mm/swap.c           |   14 +++-----------
 mm/vmscan.c         |   20 +-------------------
 4 files changed, 17 insertions(+), 30 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index cb40892..dd7b9cc 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 1dbcf88..af486e4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c

@@ -1209,6 +1209,18 @@ out:

       local_irq_restore(flags);
 }

+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);