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blk-mq: realloc hctx when hw queue is mapped to another node 

When the hw queues and mq_map are updated, a hctx could be mapped
to a different numa node. At this moment, we need to realloc the
hctx. If fail to do that, go on using previous hctx.

Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jianchao Wang 2018-10-12 18:07:27 +08:00 committed by Jens Axboe
parent 5b202853ff
commit 34d11ffac1
1 changed files with 56 additions and 26 deletions
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82
block/blk-mq.c
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@ -2521,6 +2521,39 @@ static int blk_mq_hw_ctx_size(struct blk_mq_tag_set *tag_set)
return hw_ctx_size;
}
static struct blk_mq_hw_ctx *blk_mq_alloc_and_init_hctx(
struct blk_mq_tag_set *set, struct request_queue *q,
int hctx_idx, int node)
{
struct blk_mq_hw_ctx *hctx;
hctx = kzalloc_node(blk_mq_hw_ctx_size(set),
GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY,
node);
if (!hctx)
return NULL;
if (!zalloc_cpumask_var_node(&hctx->cpumask,
GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY,
node)) {
kfree(hctx);
return NULL;
}
atomic_set(&hctx->nr_active, 0);
hctx->numa_node = node;
hctx->queue_num = hctx_idx;
if (blk_mq_init_hctx(q, set, hctx, hctx_idx)) {
free_cpumask_var(hctx->cpumask);
kfree(hctx);
return NULL;
}
blk_mq_hctx_kobj_init(hctx);
return hctx;
}
static void blk_mq_realloc_hw_ctxs(struct blk_mq_tag_set *set,
struct request_queue *q)
{
@ -2531,37 +2564,34 @@ static void blk_mq_realloc_hw_ctxs(struct blk_mq_tag_set *set,
mutex_lock(&q->sysfs_lock);
for (i = 0; i < set->nr_hw_queues; i++) {
int node;
if (hctxs[i])
continue;
struct blk_mq_hw_ctx *hctx;
node = blk_mq_hw_queue_to_node(q->mq_map, i);
hctxs[i] = kzalloc_node(blk_mq_hw_ctx_size(set),
GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY,
node);
if (!hctxs[i])
break;
/*
* If the hw queue has been mapped to another numa node,
* we need to realloc the hctx. If allocation fails, fallback
* to use the previous one.
*/
if (hctxs[i] && (hctxs[i]->numa_node == node))
continue;
if (!zalloc_cpumask_var_node(&hctxs[i]->cpumask,
GFP_NOIO | __GFP_NOWARN | __GFP_NORETRY,
node)) {
kfree(hctxs[i]);
hctxs[i] = NULL;
break;
hctx = blk_mq_alloc_and_init_hctx(set, q, i, node);
if (hctx) {
if (hctxs[i]) {
blk_mq_exit_hctx(q, set, hctxs[i], i);
kobject_put(&hctxs[i]->kobj);
}
hctxs[i] = hctx;
} else {
if (hctxs[i])
pr_warn("Allocate new hctx on node %d fails,\
fallback to previous one on node %d\n",
node, hctxs[i]->numa_node);
else
break;
}
atomic_set(&hctxs[i]->nr_active, 0);
hctxs[i]->numa_node = node;
hctxs[i]->queue_num = i;
if (blk_mq_init_hctx(q, set, hctxs[i], i)) {
free_cpumask_var(hctxs[i]->cpumask);
kfree(hctxs[i]);
hctxs[i] = NULL;
break;
}
blk_mq_hctx_kobj_init(hctxs[i]);
}
for (j = i; j < q->nr_hw_queues; j++) {
struct blk_mq_hw_ctx *hctx = hctxs[j];