From 05229beeddf7e75e2e616ddaad4b70e7fca9528d Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 5 Nov 2015 10:44:55 -0700 Subject: block: add block polling support Add basic support for polling for specific IO to complete. This uses the cookie that blk-mq passes back, which enables the block layer to pass this cookie to the driver to spin for a specific request. This will be combined with request latency tracking, so we can make qualified decisions about when to poll and when not to. For now, for benchmark purposes, we add a sysfs file that controls whether polling is enabled or not. Signed-off-by: Jens Axboe Acked-by: Christoph Hellwig Acked-by: Keith Busch --- block/blk-mq-sysfs.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'block/blk-mq-sysfs.c') diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index 6f57a110289c..1cf18784c5cf 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -174,6 +174,11 @@ static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page) return ret; } +static ssize_t blk_mq_hw_sysfs_poll_show(struct blk_mq_hw_ctx *hctx, char *page) +{ + return sprintf(page, "invoked=%lu, success=%lu\n", hctx->poll_invoked, hctx->poll_success); +} + static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx, char *page) { @@ -295,6 +300,10 @@ static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = { .attr = {.name = "cpu_list", .mode = S_IRUGO }, .show = blk_mq_hw_sysfs_cpus_show, }; +static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_poll = { + .attr = {.name = "io_poll", .mode = S_IRUGO }, + .show = blk_mq_hw_sysfs_poll_show, +}; static struct attribute *default_hw_ctx_attrs[] = { &blk_mq_hw_sysfs_queued.attr, @@ -304,6 +313,7 @@ static struct attribute *default_hw_ctx_attrs[] = { &blk_mq_hw_sysfs_tags.attr, &blk_mq_hw_sysfs_cpus.attr, &blk_mq_hw_sysfs_active.attr, + &blk_mq_hw_sysfs_poll.attr, NULL, }; -- cgit v1.2.3-70-g09d2