diff options
| author | Stephen Bates <sbates@raithlin.com> | 2016-09-13 20:23:15 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-09-14 16:41:21 +0200 |
| commit | 6e219353afa1f67f453141f7462b01708ebf5574 (patch) | |
| tree | d09924891e887e970be9a18442bebc40d2ad64ee /block/blk-mq-sysfs.c | |
| parent | nbd: allow block mq to deal with timeouts (diff) | |
| download | linux-6e219353afa1f67f453141f7462b01708ebf5574.tar.xz linux-6e219353afa1f67f453141f7462b01708ebf5574.zip | |
block: add poll_considered statistic
In order to help determine the effectiveness of polling in a running
system it is usful to determine the ratio of how often the poll
function is called vs how often the completion is checked. For this
reason we add a poll_considered variable and add it to the sysfs entry
for io_poll.
Signed-off-by: Stephen Bates <sbates@raithlin.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq-sysfs.c')
| -rw-r--r-- | block/blk-mq-sysfs.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c index fe822aa5b8e4..ea8c3f58afbd 100644 --- a/block/blk-mq-sysfs.c +++ b/block/blk-mq-sysfs.c @@ -176,7 +176,9 @@ static ssize_t blk_mq_sysfs_rq_list_show(struct blk_mq_ctx *ctx, char *page) 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); + return sprintf(page, "considered=%lu, invoked=%lu, success=%lu\n", + hctx->poll_considered, hctx->poll_invoked, + hctx->poll_success); } static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx, |