The patch titled
Subject: bootmem: micro optimize freeing pages in bulk
has been added to the -mm tree. Its filename is
bootmem-micro-optimize-freeing-pages-in-bulks.patch
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From: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Subject: 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: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/bootmem.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN mm/bootmem.c~bootmem-micro-optimize-freeing-pages-in-bulks mm/bootmem.c
--- a/mm/bootmem.c~bootmem-micro-optimize-freeing-pages-in-bulks
+++ a/mm/bootmem.c
@@ -56,7 +56,7 @@ early_param("bootmem_debug", bootmem_deb
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_boo
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);
_
Subject: Subject: bootmem: micro optimize freeing pages in bulk
Patches currently in -mm which might be from u.kleine-koenig@xxxxxxxxxxxxxx are
origin.patch
linux-next.patch
bootmem-micro-optimize-freeing-pages-in-bulks.patch
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