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Groups > linux.kernel > #1573122

[PATCH 4/6] blk-mq: include all present CPUs in the default queue mapping

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

Signed-off-by: Christoph Hellwig <hch@lst.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 8e61e8640e17..5eaecd40f701 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;
 		}
-- 
2.11.0

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spread MSI(-X) vectors to all possible CPUs Christoph Hellwig <hch@lst.de> - 2017-02-03 15:40 +0100
  [PATCH 1/6] genirq: allow assigning affinity to present but not online CPUs Christoph Hellwig <hch@lst.de> - 2017-02-03 15:40 +0100
  [PATCH 5/6] blk-mq: create hctx for each present CPU Christoph Hellwig <hch@lst.de> - 2017-02-03 15:40 +0100
  [PATCH 6/6] nvme: allocate queues for all possible CPUs Christoph Hellwig <hch@lst.de> - 2017-02-03 15:40 +0100
  [PATCH 4/6] blk-mq: include all present CPUs in the default queue mapping Christoph Hellwig <hch@lst.de> - 2017-02-03 15:40 +0100
  [PATCH 2/6] genirq/affinity: assign vectors to all present CPUs Christoph Hellwig <hch@lst.de> - 2017-02-03 15:40 +0100
  [PATCH 3/6] genirq/affinity: update CPU affinity for CPU hotplug events Christoph Hellwig <hch@lst.de> - 2017-02-03 15:40 +0100
    Re: [PATCH 3/6] genirq/affinity: update CPU affinity for CPU hotplug  events Thomas Gleixner <tglx@linutronix.de> - 2017-02-10 12:20 +0100

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