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mm/huge_memory: minor cleanup for split_huge_pages_all

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There is nothing to do if a zone doesn't have any pages managed by the
buddy allocator. So we should check managed_zone instead. Also if a thp
is found, there's no need to traverse the subpages again.

Link: https://lkml.kernel.org/r/20220704132201.14611-13-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-07-04 21:21:57 +08:00 committed by akpm
parent 0b175468a0
commit a17206dac7
1 changed files with 6 additions and 1 deletions
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7
mm/huge_memory.c
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@ -2857,9 +2857,12 @@ static void split_huge_pages_all(void)
unsigned long total = 0, split = 0;
pr_debug("Split all THPs\n");
for_each_populated_zone(zone) {
for_each_zone(zone) {
if (!managed_zone(zone))
continue;
max_zone_pfn = zone_end_pfn(zone);
for (pfn = zone->zone_start_pfn; pfn < max_zone_pfn; pfn++) {
int nr_pages;
if (!pfn_valid(pfn))
continue;
@ -2875,8 +2878,10 @@ static void split_huge_pages_all(void)
total++;
lock_page(page);
nr_pages = thp_nr_pages(page);
if (!split_huge_page(page))
split++;
pfn += nr_pages - 1;
unlock_page(page);
next:
put_page(page);