diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-10 17:23:49 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-10 17:23:49 -0800 |
commit | 3419b45039c6b799c974a8019361c045e7ca232c (patch) | |
tree | 36a63602036cc50f34fadcbd5d5d8fca94e44297 /block/blk-sysfs.c | |
parent | 01504f5e9e071f1dde1062e3be15f54d4555308f (diff) | |
parent | c1c534609fe8a859f9c8108a5591e6e8a97e34d1 (diff) |
Merge branch 'for-4.4/io-poll' of git://git.kernel.dk/linux-block
Pull block IO poll support from Jens Axboe:
"Various groups have been doing experimentation around IO polling for
(really) fast devices. The code has been reviewed and has been
sitting on the side for a few releases, but this is now good enough
for coordinated benchmarking and further experimentation.
Currently O_DIRECT sync read/write are supported. A framework is in
the works that allows scalable stats tracking so we can auto-tune
this. And we'll add libaio support as well soon. Fow now, it's an
opt-in feature for test purposes"
* 'for-4.4/io-poll' of git://git.kernel.dk/linux-block:
direct-io: be sure to assign dio->bio_bdev for both paths
directio: add block polling support
NVMe: add blk polling support
block: add block polling support
blk-mq: return tag/queue combo in the make_request_fn handlers
block: change ->make_request_fn() and users to return a queue cookie
Diffstat (limited to 'block/blk-sysfs.c')
-rw-r--r-- | block/blk-sysfs.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index 31849e328b45..565b8dac5782 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -317,6 +317,34 @@ queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count) return ret; } +static ssize_t queue_poll_show(struct request_queue *q, char *page) +{ + return queue_var_show(test_bit(QUEUE_FLAG_POLL, &q->queue_flags), page); +} + +static ssize_t queue_poll_store(struct request_queue *q, const char *page, + size_t count) +{ + unsigned long poll_on; + ssize_t ret; + + if (!q->mq_ops || !q->mq_ops->poll) + return -EINVAL; + + ret = queue_var_store(&poll_on, page, count); + if (ret < 0) + return ret; + + spin_lock_irq(q->queue_lock); + if (poll_on) + queue_flag_set(QUEUE_FLAG_POLL, q); + else + queue_flag_clear(QUEUE_FLAG_POLL, q); + spin_unlock_irq(q->queue_lock); + + return ret; +} + static struct queue_sysfs_entry queue_requests_entry = { .attr = {.name = "nr_requests", .mode = S_IRUGO | S_IWUSR }, .show = queue_requests_show, @@ -442,6 +470,12 @@ static struct queue_sysfs_entry queue_random_entry = { .store = queue_store_random, }; +static struct queue_sysfs_entry queue_poll_entry = { + .attr = {.name = "io_poll", .mode = S_IRUGO | S_IWUSR }, + .show = queue_poll_show, + .store = queue_poll_store, +}; + static struct attribute *default_attrs[] = { &queue_requests_entry.attr, &queue_ra_entry.attr, @@ -466,6 +500,7 @@ static struct attribute *default_attrs[] = { &queue_rq_affinity_entry.attr, &queue_iostats_entry.attr, &queue_random_entry.attr, + &queue_poll_entry.attr, NULL, }; |