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Subject[PATCH v3 2/4] mm: migrate: Introduce a local variable to get the number of pages
Date
Use thp_nr_pages() instead of compound_nr() to get the number of pages
for THP page, meanwhile introducing a local variable 'nr_pages' to
avoid getting the number of pages repeatedly.

Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Yang Shi <shy828301@gmail.com>
---
mm/migrate.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 4c93d98..9520d2f 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2102,6 +2102,7 @@ static struct page *alloc_misplaced_dst_page_thp(struct page *page,
static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
{
int page_lru;
+ int nr_pages = thp_nr_pages(page);

VM_BUG_ON_PAGE(compound_order(page) && !PageTransHuge(page), page);

@@ -2110,7 +2111,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)
return 0;

/* Avoid migrating to a node that is nearly full */
- if (!migrate_balanced_pgdat(pgdat, compound_nr(page)))
+ if (!migrate_balanced_pgdat(pgdat, nr_pages))
return 0;

if (isolate_lru_page(page))
@@ -2118,7 +2119,7 @@ static int numamigrate_isolate_page(pg_data_t *pgdat, struct page *page)

page_lru = page_is_file_lru(page);
mod_node_page_state(page_pgdat(page), NR_ISOLATED_ANON + page_lru,
- thp_nr_pages(page));
+ nr_pages);

/*
* Isolating the page has taken another reference, so the
--
1.8.3.1
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