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From:   "Pavel Begunkov (Silence)" <asml.silence@gmail.com>
To:     Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Pavel Begunkov <asml.silence@gmail.com>
Subject: [PATCH] blk-stat: Optimise blk_stat_add()
Date:   Tue,  8 Oct 2019 00:16:51 +0300
Message-Id: <39dd33cc6f0264b2ec2f79f1dfe21466c2180851.1570482929.git.asml.silence@gmail.com>
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From: Pavel Begunkov <asml.silence@gmail.com>

blk_stat_add() calls {get,put}_cpu_ptr() in a loop, which entails
overhead of disabling/enabling preemption. The loop is under RCU
(i.e.short) anyway, so do get_cpu() in advance.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
---
 block/blk-stat.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/block/blk-stat.c b/block/blk-stat.c
index d892ad2cb938..4239954b0bce 100644
--- a/block/blk-stat.c
+++ b/block/blk-stat.c
@@ -75,7 +75,7 @@ void blk_stat_add(struct request *rq, u64 now)
 	struct request_queue *q = rq->q;
 	struct blk_stat_callback *cb;
 	struct blk_rq_stat_staging *stat;
-	int bucket;
+	int bucket, cpu;
 	u64 value;
 
 	value = (now >= rq->io_start_time_ns) ? now - rq->io_start_time_ns : 0;
@@ -83,6 +83,7 @@ void blk_stat_add(struct request *rq, u64 now)
 	blk_throtl_stat_add(rq, value);
 
 	rcu_read_lock();
+	cpu = get_cpu();
 	list_for_each_entry_rcu(cb, &q->stats->callbacks, list) {
 		if (!blk_stat_is_active(cb))
 			continue;
@@ -91,10 +92,10 @@ void blk_stat_add(struct request *rq, u64 now)
 		if (bucket < 0)
 			continue;
 
-		stat = &get_cpu_ptr(cb->cpu_stat)[bucket];
+		stat = &per_cpu_ptr(cb->cpu_stat, cpu)[bucket];
 		blk_rq_stat_add(stat, value);
-		put_cpu_ptr(cb->cpu_stat);
 	}
+	put_cpu();
 	rcu_read_unlock();
 }
 
-- 
2.23.0