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Commit 9571a982 authored by Uwe Kleine-König's avatar Uwe Kleine-König Committed by Linus Torvalds
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bootmem: micro optimize freeing pages in bulk 



The first entry of bdata->node_bootmem_map holds the data for
bdata->node_min_pfn up to bdata->node_min_pfn + BITS_PER_LONG - 1.  So the
test for freeing all pages of a single map entry can be slightly relaxed.

Moreover use DIV_ROUND_UP in another place instead of open coding it.

Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Johannes Weiner <hannes@saeurebad.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 31b8384a

mm/bootmem.c

+2 −2
Original line number Diff line number Diff line
@@ -56,7 +56,7 @@ early_param("bootmem_debug", bootmem_debug_setup); 


static unsigned long __init bootmap_bytes(unsigned long pages)

{

	unsigned long bytes = (pages + 7) / 8;

	unsigned long bytes = DIV_ROUND_UP(pages, 8);



	return ALIGN(bytes, sizeof(long));

}
@@ -197,7 +197,7 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) 
		idx = start - bdata->node_min_pfn;

		vec = ~map[idx / BITS_PER_LONG];



		if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) {

		if (aligned && vec == ~0UL && start + BITS_PER_LONG <= end) {

			int order = ilog2(BITS_PER_LONG);



			__free_pages_bootmem(pfn_to_page(start), order);