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From:   Mel Gorman <mgorman@techsingularity.net>
To:     Linux-MM <linux-mm@kvack.org>,
        Linux-RT-Users <linux-rt-users@vger.kernel.org>
Cc:     LKML <linux-kernel@vger.kernel.org>,
        Chuck Lever <chuck.lever@oracle.com>,
        Jesper Dangaard Brouer <brouer@redhat.com>,
        Matthew Wilcox <willy@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@kernel.org>,
        Michal Hocko <mhocko@kernel.org>,
        Oscar Salvador <osalvador@suse.de>,
        Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 11/11] mm/page_alloc: Update PGFREE outside the zone lock in __free_pages_ok
Date:   Wed,  7 Apr 2021 21:24:23 +0100
Message-Id: <20210407202423.16022-12-mgorman@techsingularity.net>
In-Reply-To: <20210407202423.16022-1-mgorman@techsingularity.net>
References: <20210407202423.16022-1-mgorman@techsingularity.net>
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VM events do not need explicit protection by disabling IRQs so
update the counter with IRQs enabled in __free_pages_ok.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
 mm/page_alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 6d98d97b6cf5..49951dd841fa 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1569,10 +1569,11 @@ static void __free_pages_ok(struct page *page, unsigned int order,
 	migratetype = get_pfnblock_migratetype(page, pfn);
 
 	spin_lock_irqsave(&zone->lock, flags);
-	__count_vm_events(PGFREE, 1 << order);
 	migratetype = check_migratetype_isolated(zone, page, pfn, migratetype);
 	__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)
-- 
2.26.2