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| author | Jens Axboe <axboe@kernel.dk> | 2013-11-19 09:25:07 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-11-19 09:25:07 -0700 |
| commit | 94eddfbeaafa3e8040a2c47d370dea0e58e76941 (patch) | |
| tree | 52cdf7a26b27d9cab3b1eba9b424a6d1432bdf8d /block | |
| parent | 34f2fd8dfe6185b0eaaf7d661281713a6170b077 (diff) | |
| download | lwn-94eddfbeaafa3e8040a2c47d370dea0e58e76941.tar.gz lwn-94eddfbeaafa3e8040a2c47d370dea0e58e76941.zip | |
blk-mq: ensure that we set REQ_IO_STAT so diskstats work
If disk stats are enabled on the queue, a request needs to
be marked with REQ_IO_STAT for accounting to be active on
that request. This fixes an issue with virtio-blk not
showing up in /proc/diskstats after the conversion to
blk-mq.
Add QUEUE_FLAG_MQ_DEFAULT, setting stats and same cpu-group
completion on by default.
Reported-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 862f458d4760..32593dba4684 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -171,9 +171,12 @@ bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) } EXPORT_SYMBOL(blk_mq_can_queue); -static void blk_mq_rq_ctx_init(struct blk_mq_ctx *ctx, struct request *rq, - unsigned int rw_flags) +static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx, + struct request *rq, unsigned int rw_flags) { + if (blk_queue_io_stat(q)) + rw_flags |= REQ_IO_STAT; + rq->mq_ctx = ctx; rq->cmd_flags = rw_flags; ctx->rq_dispatched[rw_is_sync(rw_flags)]++; @@ -197,7 +200,7 @@ static struct request *blk_mq_alloc_request_pinned(struct request_queue *q, rq = __blk_mq_alloc_request(hctx, gfp & ~__GFP_WAIT, reserved); if (rq) { - blk_mq_rq_ctx_init(ctx, rq, rw); + blk_mq_rq_ctx_init(q, ctx, rq, rw); break; } else if (!(gfp & __GFP_WAIT)) break; @@ -921,7 +924,7 @@ static void blk_mq_make_request(struct request_queue *q, struct bio *bio) trace_block_getrq(q, bio, rw); rq = __blk_mq_alloc_request(hctx, GFP_ATOMIC, false); if (likely(rq)) - blk_mq_rq_ctx_init(ctx, rq, rw); + blk_mq_rq_ctx_init(q, ctx, rq, rw); else { blk_mq_put_ctx(ctx); trace_block_sleeprq(q, bio, rw); @@ -1377,6 +1380,7 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_reg *reg, q->queue_hw_ctx = hctxs; q->mq_ops = reg->ops; + q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT; blk_queue_make_request(q, blk_mq_make_request); blk_queue_rq_timed_out(q, reg->ops->timeout); |