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block: fixup block IO unplug trace call

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It was removed with the on-stack plugging, readd it and track the
depth of requests added when flushing the plug.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Jens Axboe 2011-04-12 10:12:19 +02:00
parent d9c9783317
commit 94b5eb28b4
3 changed files with 22 additions and 10 deletions
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15
block/blk-core.c
View file

@ -2668,12 +2668,19 @@ static int plug_rq_cmp(void *priv, struct list_head *a, struct list_head *b)
return !(rqa->q <= rqb->q);
}
static void queue_unplugged(struct request_queue *q, unsigned int depth)
{
trace_block_unplug_io(q, depth);
__blk_run_queue(q, false);
}
static void flush_plug_list(struct blk_plug *plug)
{
struct request_queue *q;
unsigned long flags;
struct request *rq;
LIST_HEAD(list);
unsigned int depth;
BUG_ON(plug->magic != PLUG_MAGIC);
@ -2688,6 +2695,7 @@ static void flush_plug_list(struct blk_plug *plug)
}
q = NULL;
depth = 0;
local_irq_save(flags);
while (!list_empty(&list)) {
rq = list_entry_rq(list.next);
@ -2696,10 +2704,11 @@ static void flush_plug_list(struct blk_plug *plug)
BUG_ON(!rq->q);
if (rq->q != q) {
if (q) {
__blk_run_queue(q, false);
queue_unplugged(q, depth);
spin_unlock(q->queue_lock);
}
q = rq->q;
depth = 0;
spin_lock(q->queue_lock);
}
rq->cmd_flags &= ~REQ_ON_PLUG;
@ -2711,10 +2720,12 @@ static void flush_plug_list(struct blk_plug *plug)
__elv_add_request(q, rq, ELEVATOR_INSERT_FLUSH);
else
__elv_add_request(q, rq, ELEVATOR_INSERT_SORT_MERGE);
depth++;
}
if (q) {
__blk_run_queue(q, false);
queue_unplugged(q, depth);
spin_unlock(q->queue_lock);
}

11
include/trace/events/block.h
View file

@ -401,9 +401,9 @@ TRACE_EVENT(block_plug,
DECLARE_EVENT_CLASS(block_unplug,
TP_PROTO(struct request_queue *q),
TP_PROTO(struct request_queue *q, unsigned int depth),
TP_ARGS(q),
TP_ARGS(q, depth),
TP_STRUCT__entry(
__field( int, nr_rq )
@ -411,7 +411,7 @@ DECLARE_EVENT_CLASS(block_unplug,
),
TP_fast_assign(
__entry->nr_rq = q->rq.count[READ] + q->rq.count[WRITE];
__entry->nr_rq = depth;
memcpy(__entry->comm, current->comm, TASK_COMM_LEN);
),
@ -421,15 +421,16 @@ DECLARE_EVENT_CLASS(block_unplug,
/**
* block_unplug_io - release of operations requests in request queue
* @q: request queue to unplug
* @depth: number of requests just added to the queue
*
* Unplug request queue @q because device driver is scheduled to work
* on elements in the request queue.
*/
DEFINE_EVENT(block_unplug, block_unplug_io,
TP_PROTO(struct request_queue *q),
TP_PROTO(struct request_queue *q, unsigned int depth),
TP_ARGS(q)
TP_ARGS(q, depth)
);
/**

6
kernel/trace/blktrace.c
View file

@ -850,13 +850,13 @@ static void blk_add_trace_plug(void *ignore, struct request_queue *q)
__blk_add_trace(bt, 0, 0, 0, BLK_TA_PLUG, 0, 0, NULL);
}
static void blk_add_trace_unplug_io(void *ignore, struct request_queue *q)
static void blk_add_trace_unplug_io(void *ignore, struct request_queue *q,
unsigned int depth)
{
struct blk_trace *bt = q->blk_trace;
if (bt) {
unsigned int pdu = q->rq.count[READ] + q->rq.count[WRITE];
__be64 rpdu = cpu_to_be64(pdu);
__be64 rpdu = cpu_to_be64(depth);
__blk_add_trace(bt, 0, 0, 0, BLK_TA_UNPLUG_IO, 0,
sizeof(rpdu), &rpdu);