linux-kernel - [PATCH] mm/page-writeback: Use __this_cpu_inc() in account_page

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Message-Id: <20210512144742.4764-1-wuchi.zero@gmail.com>
Date:   Wed, 12 May 2021 22:47:42 +0800
From:   Chi Wu <wuchi.zero@...il.com>
To:     akpm@...ux-foundation.org
Cc:     axboe@...com, hcochran@...nelspring.com, jack@...e.cz,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        mszeredi@...hat.com, sedat.dilek@...il.com, tj@...nel.org,
        Chi Wu <wuchi.zero@...il.com>
Subject: [PATCH] mm/page-writeback: Use __this_cpu_inc() in account_page_dirtied()

As account_page_dirtied() was always protected by xa_lock_irqsave(),
so using __this_cpu_inc() is better.

Signed-off-by: Chi Wu <wuchi.zero@...il.com>
---
 mm/page-writeback.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0062d5c57d41..e3901d0d329e 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2436,7 +2436,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
 		inc_wb_stat(wb, WB_DIRTIED);
 		task_io_account_write(PAGE_SIZE);
 		current->nr_dirtied++;
-		this_cpu_inc(bdp_ratelimits);
+		__this_cpu_inc(bdp_ratelimits);
 
 		mem_cgroup_track_foreign_dirty(page, wb);
 	}
-- 
2.17.1