We should not check loop+1 with loop end in loop body.
Just duplicate two lines code to avoid it.
That will help a bit when we have huge amount of pages on
system with 16TiB memory.
Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
---
mm/page_alloc.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
Index: linux-2.6/mm/page_alloc.c
===================================================================
--- linux-2.6.orig/mm/page_alloc.c
+++ linux-2.6/mm/page_alloc.c
@@ -750,19 +750,19 @@ static void __free_pages_ok(struct page
void __init __free_pages_bootmem(struct page *page, unsigned int order)
{
unsigned int nr_pages = 1 << order;
+ struct page *p = page;
unsigned int loop;
- prefetchw(page);
- for (loop = 0; loop < nr_pages; loop++) {
- struct page *p = &page[loop];
-
- if (loop + 1 < nr_pages)
- prefetchw(p + 1);
+ prefetchw(p);
+ for (loop = 0; loop < (nr_pages - 1); loop++, p++) {
+ prefetchw(p + 1);
__ClearPageReserved(p);
set_page_count(p, 0);
}
+ __ClearPageReserved(p);
+ set_page_count(p, 0);
- page_zone(page)->managed_pages += 1 << order;
+ page_zone(page)->managed_pages += nr_pages;
set_page_refcounted(page);
__free_pages(page, order);
}
--
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