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Date: Wed, 10 Sep 2014 12:13:31 +0800
From: Ming Lei <ming.lei@...onical.com>
To: Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org
Cc: Christoph Hellwig <hch@....de>, Ming Lei <ming.lei@...onical.com>
Subject: [PATCH v1 8/8] blk-mq: support per-distpatch_queue flush machinery
This patch supports to run one single lush machinery for
each blk-mq dispatch queue, so that:
- current init_request and exit_request callbacks can
cover flush request too, then the buggy copying way of
initializing flush request's pdu can be fixed
- flushing performance gets improved in case of multi hw-queue
In both fio write and randwrite test over virtio-blk(4 hw queues,
backed by nullblk) with sync=1, ioengine=sync, iodepth=64, numjobs=4,
it is observed that througput gets increased by 70% in the VM
over my laptop environment.
The multi virtqueue feature isn't merged to QEMU yet, and patches for
the feature can be found in below tree:
git://kernel.ubuntu.com/ming/qemu.git v2.1.0-mq.3
And simply passing 'num_queues=4 vectors=5' should be enough to
enable multi queue feature for QEMU virtio-blk.
Suggested-by: Christoph Hellwig <hch@....de>
Signed-off-by: Ming Lei <ming.lei@...onical.com>
---
block/blk-flush.c | 86 ++++++++++++++++++++++++++++++++++++++++++++----
block/blk.h | 12 ++++++-
include/linux/blk-mq.h | 2 ++
3 files changed, 93 insertions(+), 7 deletions(-)
diff --git a/block/blk-flush.c b/block/blk-flush.c
index f8cc690..6a43b1c 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -483,22 +483,23 @@ int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
EXPORT_SYMBOL(blkdev_issue_flush);
static struct blk_flush_queue *blk_alloc_flush_queue(
- struct request_queue *q)
+ struct request_queue *q, struct blk_mq_hw_ctx *hctx)
{
struct blk_flush_queue *fq;
int rq_sz = sizeof(struct request);
+ int node = hctx ? hctx->numa_node : NUMA_NO_NODE;
- fq = kzalloc(sizeof(*fq), GFP_KERNEL);
+ fq = kzalloc_node(sizeof(*fq), GFP_KERNEL, node);
if (!fq)
goto fail;
- if (q->mq_ops) {
+ if (hctx) {
spin_lock_init(&fq->mq_flush_lock);
rq_sz = round_up(rq_sz + q->tag_set->cmd_size,
cache_line_size());
}
- fq->flush_rq = kzalloc(rq_sz, GFP_KERNEL);
+ fq->flush_rq = kzalloc_node(rq_sz, GFP_KERNEL, node);
if (!fq->flush_rq)
goto fail_rq;
@@ -520,9 +521,79 @@ static void blk_free_flush_queue(struct blk_flush_queue *fq)
kfree(fq);
}
+static void __blk_mq_exit_flush(struct request_queue *q,
+ unsigned free_end, unsigned int exit_end)
+{
+ struct blk_mq_hw_ctx *hctx;
+ unsigned int k;
+ struct blk_flush_queue *fq;
+ struct blk_mq_tag_set *set = q->tag_set;
+ unsigned start_idx = set->queue_depth;
+
+ queue_for_each_hw_ctx(q, hctx, k) {
+ if (k >= free_end)
+ break;
+
+ fq = hctx->fq;
+ if (k < exit_end && set->ops->exit_request)
+ set->ops->exit_request(set->driver_data,
+ fq->flush_rq, k,
+ start_idx + k);
+
+ blk_free_flush_queue(fq);
+ }
+
+}
+
+static int blk_mq_init_flush(struct request_queue *q)
+{
+ struct blk_mq_hw_ctx *hctx;
+ unsigned int i, j = 0;
+ struct blk_flush_queue *fq;
+ struct blk_mq_tag_set *set = q->tag_set;
+ unsigned start_idx = set->queue_depth;
+ int ret;
+
+ queue_for_each_hw_ctx(q, hctx, i) {
+ fq = blk_alloc_flush_queue(q, hctx);
+ if (IS_ERR(fq)) {
+ ret = PTR_ERR(fq);
+ goto fail;
+ }
+
+ hctx->fq = fq;
+ }
+ queue_for_each_hw_ctx(q, hctx, j) {
+ fq = hctx->fq;
+ if (set->ops->init_request) {
+ ret = set->ops->init_request(set->driver_data,
+ fq->flush_rq, j, start_idx + j,
+ hctx->numa_node);
+ if (ret)
+ goto fail;
+ }
+ }
+
+ return 0;
+
+ fail:
+ __blk_mq_exit_flush(q, i, j);
+ return ret;
+}
+
+static void blk_mq_exit_flush(struct request_queue *q)
+{
+ struct blk_mq_tag_set *set = q->tag_set;
+
+ __blk_mq_exit_flush(q, set->nr_hw_queues, set->nr_hw_queues);
+}
+
int blk_init_flush(struct request_queue *q)
{
- q->fq = blk_alloc_flush_queue(q);
+ if (q->mq_ops)
+ return blk_mq_init_flush(q);
+
+ q->fq = blk_alloc_flush_queue(q, NULL);
if (IS_ERR(q->fq))
return PTR_ERR(q->fq);
@@ -531,5 +602,8 @@ int blk_init_flush(struct request_queue *q)
void blk_exit_flush(struct request_queue *q)
{
- blk_free_flush_queue(q->fq);
+ if (q->mq_ops)
+ blk_mq_exit_flush(q);
+ else
+ blk_free_flush_queue(q->fq);
}
diff --git a/block/blk.h b/block/blk.h
index 30f8033..dd9489f 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -2,6 +2,8 @@
#define BLK_INTERNAL_H
#include <linux/idr.h>
+#include <linux/blk-mq.h>
+#include "blk-mq.h"
/* Amount of time in which a process may batch requests */
#define BLK_BATCH_TIME (HZ/50UL)
@@ -31,7 +33,15 @@ extern struct ida blk_queue_ida;
static inline struct blk_flush_queue *blk_get_flush_queue(
struct request_queue *q, struct blk_mq_ctx *ctx)
{
- return q->fq;
+ struct blk_mq_hw_ctx *hctx;
+
+ if (!q->mq_ops)
+ return q->fq;
+
+ WARN_ON(!ctx);
+ hctx = q->mq_ops->map_queue(q, ctx->cpu);
+
+ return hctx->fq;
}
static inline void __blk_get_queue(struct request_queue *q)
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index a1e31f2..1f3c523 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -4,6 +4,7 @@
#include <linux/blkdev.h>
struct blk_mq_tags;
+struct blk_flush_queue;
struct blk_mq_cpu_notifier {
struct list_head list;
@@ -34,6 +35,7 @@ struct blk_mq_hw_ctx {
struct request_queue *queue;
unsigned int queue_num;
+ struct blk_flush_queue *fq;
void *driver_data;
--
1.7.9.5
--
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