[168/192] mm/page_alloc: update PGFREE outside the zone lock in __free_pages_ok

Commit Message

Andrew Morton June 29, 2021, 2:42 a.m. UTC

From: Mel Gorman <[e-mail]>
Subject: mm/page_alloc: update PGFREE outside the zone lock in __free_pages_ok

VM events do not need explicit protection by disabling IRQs so update the
counter with IRQs enabled in __free_pages_ok.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Mel Gorman <[e-mail]>
Acked-by: Vlastimil Babka <[e-mail]>
Acked-by: Peter Zijlstra (Intel) <[e-mail]>
Cc: Chuck Lever <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jesper Dangaard Brouer <[e-mail]>
Cc: Michal Hocko <[e-mail]>
Cc: Sebastian Andrzej Siewior <[e-mail]>
Cc: Thomas Gleixner <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 mm/page_alloc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Patch

--- a/mm/page_alloc.c~mm-page_alloc-update-pgfree-outside-the-zone-lock-in-__free_pages_ok
+++ a/mm/page_alloc.c
@@ -1600,13 +1600,14 @@  static void __free_pages_ok(struct page
 	migratetype = get_pfnblock_migratetype(page, pfn);
 
 	spin_lock_irqsave(&zone->lock, flags);
-	__count_vm_events(PGFREE, 1 << order);
 	if (unlikely(has_isolate_pageblock(zone) ||
 		is_migrate_isolate(migratetype))) {
 		migratetype = get_pfnblock_migratetype(page, pfn);
 	}
 	__free_one_page(page, pfn, zone, order, migratetype, fpi_flags);
 	spin_unlock_irqrestore(&zone->lock, flags);
+
+	__count_vm_events(PGFREE, 1 << order);
 }
 
 void __free_pages_core(struct page *page, unsigned int order)