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block: remove REQ_ATOM_POLL_SLEPT

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We don't need this to be an atomic flag, it can be a regular
flag. We either end up on the same CPU for the polling, in which
case the state is sane, or we did the sleep which would imply
the needed barrier to ensure we see the right state.

Reviewed-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2018-01-10 11:30:56 -07:00
parent 5d75d3f2e7
commit 76a86f9d02
4 changed files with 5 additions and 6 deletions
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2
block/blk-mq-debugfs.c
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@ -290,13 +290,13 @@ static const char *const rqf_name[] = {
RQF_NAME(SPECIAL_PAYLOAD),
RQF_NAME(ZONE_WRITE_LOCKED),
RQF_NAME(MQ_TIMEOUT_EXPIRED),
RQF_NAME(MQ_POLL_SLEPT),
};
#undef RQF_NAME
#define RQAF_NAME(name) [REQ_ATOM_##name] = #name
static const char *const rqaf_name[] = {
RQAF_NAME(COMPLETE),
RQAF_NAME(POLL_SLEPT),
};
#undef RQAF_NAME

5
block/blk-mq.c
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@ -483,7 +483,6 @@ void blk_mq_free_request(struct request *rq)
blk_put_rl(blk_rq_rl(rq));
blk_mq_rq_update_state(rq, MQ_RQ_IDLE);
clear_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags);
if (rq->tag != -1)
blk_mq_put_tag(hctx, hctx->tags, ctx, rq->tag);
if (sched_tag != -1)
@ -2976,7 +2975,7 @@ static bool blk_mq_poll_hybrid_sleep(struct request_queue *q,
unsigned int nsecs;
ktime_t kt;
if (test_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags))
if (rq->rq_flags & RQF_MQ_POLL_SLEPT)
return false;
/*
@ -2996,7 +2995,7 @@ static bool blk_mq_poll_hybrid_sleep(struct request_queue *q,
if (!nsecs)
return false;
set_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags);
rq->rq_flags |= RQF_MQ_POLL_SLEPT;
/*
* This will be replaced with the stats tracking code, using

2
block/blk.h
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@ -124,8 +124,6 @@ void blk_account_io_done(struct request *req);
*/
enum rq_atomic_flags {
REQ_ATOM_COMPLETE = 0,
REQ_ATOM_POLL_SLEPT,
};
/*

2
include/linux/blkdev.h
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@ -127,6 +127,8 @@ typedef __u32 __bitwise req_flags_t;
#define RQF_ZONE_WRITE_LOCKED ((__force req_flags_t)(1 << 19))
/* timeout is expired */
#define RQF_MQ_TIMEOUT_EXPIRED ((__force req_flags_t)(1 << 20))
/* already slept for hybrid poll */
#define RQF_MQ_POLL_SLEPT ((__force req_flags_t)(1 << 21))
/* flags that prevent us from merging requests: */
#define RQF_NOMERGE_FLAGS \