Andrew Morton wrote:
On Mon, 29 Aug 2011 16:48:46 +0900
Minchan Kim<minchan.kim@xxxxxxxxx> wrote:
On Fri, Jul 29, 2011 at 4:58 PM, Konstantin Khlebnikov
<khlebnikov@xxxxxxxxxx> wrote:
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<khlebnikov@xxxxxxxxxx>
---
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);
I understand you want to minimize changes without breaking current ABI
with trace tools.
But apparently, It's not a pagvec_free. It just hurts readability.
As I take a look at the code, mm_pagevec_free isn't related to pagevec
but I guess it can represent 0-order pages free because 0-order pages
are freed only by pagevec until now.
So, how about renaming it with mm_page_free or mm_page_free_zero_order?
If you do, you need to do s/MM_PAGEVEC_FREE/MM_FREE_FREE/g in
trace-pagealloc-postprocess.pl.
+ free_hot_cold_page(page, cold);
+ }
+
+ INIT_LIST_HEAD(list);
Why do we need it?
My email has been horrid for a couple of months (fixed now), so I might
have missed any reply to Minchin's review comments?
Sorry, I forget about this patch. v2 sended.
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