linux-kernel - [tip:irq/core] blk-mq: Include all present CPUs in the default queue mapping

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Message-ID: <tip-5f042e7cbd9ebd3580077dcdc21f35e68c2adf5f@git.kernel.org>
Date:   Wed, 28 Jun 2017 14:03:58 -0700
From:   tip-bot for Christoph Hellwig <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mingo@...nel.org, tglx@...utronix.de, hpa@...or.com,
        linux-kernel@...r.kernel.org, keith.busch@...el.com,
        axboe@...nel.dk, hch@....de
Subject: [tip:irq/core] blk-mq: Include all present CPUs in the default
 queue mapping

Commit-ID:  5f042e7cbd9ebd3580077dcdc21f35e68c2adf5f
Gitweb:     http://git.kernel.org/tip/5f042e7cbd9ebd3580077dcdc21f35e68c2adf5f
Author:     Christoph Hellwig <hch@....de>
AuthorDate: Mon, 26 Jun 2017 12:20:56 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Wed, 28 Jun 2017 23:00:06 +0200

blk-mq: Include all present CPUs in the default queue mapping

This way we get a nice distribution independent of the current cpu
online / offline state.

Signed-off-by: Christoph Hellwig <hch@....de>
Reviewed-by: Jens Axboe <axboe@...nel.dk>
Cc: Keith Busch <keith.busch@...el.com>
Cc: linux-block@...r.kernel.org
Cc: linux-nvme@...ts.infradead.org
Link: http://lkml.kernel.org/r/20170626102058.10200-2-hch@lst.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

---
 block/blk-mq-cpumap.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 8e61e86..5eaecd4 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -35,7 +35,6 @@ int blk_mq_map_queues(struct blk_mq_tag_set *set)
 {
 	unsigned int *map = set->mq_map;
 	unsigned int nr_queues = set->nr_hw_queues;
-	const struct cpumask *online_mask = cpu_online_mask;
 	unsigned int i, nr_cpus, nr_uniq_cpus, queue, first_sibling;
 	cpumask_var_t cpus;
 
@@ -44,7 +43,7 @@ int blk_mq_map_queues(struct blk_mq_tag_set *set)
 
 	cpumask_clear(cpus);
 	nr_cpus = nr_uniq_cpus = 0;
-	for_each_cpu(i, online_mask) {
+	for_each_present_cpu(i) {
 		nr_cpus++;
 		first_sibling = get_first_sibling(i);
 		if (!cpumask_test_cpu(first_sibling, cpus))
@@ -54,7 +53,7 @@ int blk_mq_map_queues(struct blk_mq_tag_set *set)
 
 	queue = 0;
 	for_each_possible_cpu(i) {
-		if (!cpumask_test_cpu(i, online_mask)) {
+		if (!cpumask_test_cpu(i, cpu_present_mask)) {
 			map[i] = 0;
 			continue;
 		}