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Subject[PATCH V2 1/3] blk-mq: allocate blk_mq_tags and requests in correct node
Date
blk_mq_tags/requests of specific hardware queue are mostly used in
specific cpus, which might not be in the same numa node as disk. For
example, a nvme card is in node 0. half hardware queue will be used by
node 0, the other node 1.

Signed-off-by: Shaohua Li <shli@fb.com>
---
block/blk-mq.c | 21 +++++++++++++++------
1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 48df5fd..888077c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1666,16 +1666,20 @@ struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
unsigned int reserved_tags)
{
struct blk_mq_tags *tags;
+ int node;
+
+ node = blk_mq_hw_queue_to_node(set->mq_map, hctx_idx);
+ if (node == NUMA_NO_NODE)
+ node = set->numa_node;

- tags = blk_mq_init_tags(nr_tags, reserved_tags,
- set->numa_node,
+ tags = blk_mq_init_tags(nr_tags, reserved_tags, node,
BLK_MQ_FLAG_TO_ALLOC_POLICY(set->flags));
if (!tags)
return NULL;

tags->rqs = kzalloc_node(nr_tags * sizeof(struct request *),
GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY,
- set->numa_node);
+ node);
if (!tags->rqs) {
blk_mq_free_tags(tags);
return NULL;
@@ -1683,7 +1687,7 @@ struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,

tags->static_rqs = kzalloc_node(nr_tags * sizeof(struct request *),
GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY,
- set->numa_node);
+ node);
if (!tags->static_rqs) {
kfree(tags->rqs);
blk_mq_free_tags(tags);
@@ -1703,6 +1707,11 @@ int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
{
unsigned int i, j, entries_per_page, max_order = 4;
size_t rq_size, left;
+ int node;
+
+ node = blk_mq_hw_queue_to_node(set->mq_map, hctx_idx);
+ if (node == NUMA_NO_NODE)
+ node = set->numa_node;

INIT_LIST_HEAD(&tags->page_list);

@@ -1724,7 +1733,7 @@ int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
this_order--;

do {
- page = alloc_pages_node(set->numa_node,
+ page = alloc_pages_node(node,
GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY | __GFP_ZERO,
this_order);
if (page)
@@ -1757,7 +1766,7 @@ int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
if (set->ops->init_request) {
if (set->ops->init_request(set->driver_data,
rq, hctx_idx, i,
- set->numa_node)) {
+ node)) {
tags->static_rqs[i] = NULL;
goto fail;
}
--
2.9.3
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