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Commit e2d0bd2b authored by Yinghai Lu's avatar Yinghai Lu Committed by Linus Torvalds
Browse files

mm: kill one if loop in __free_pages_bootmem() 



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: default avatarYinghai Lu <yinghai@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f92310c1

mm/page_alloc.c

+7 −7
Original line number Diff line number Diff line
@@ -751,19 +751,19 @@ static void __free_pages_ok(struct page *page, unsigned int order) 
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);

	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);

}