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block: enable zeroing of io_poll statistics

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Allow the io_poll statistics to be zeroed to make for easier logging
of polling event.

Signed-off-by: Stephen Bates <sbates@raithlin.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Stephen Bates 2016-09-13 12:23:16 -06:00 committed by Jens Axboe
parent 6e219353af
commit d21ea4bc0f
1 changed files with 10 additions and 1 deletions
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11
block/blk-mq-sysfs.c
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@ -181,6 +181,14 @@ static ssize_t blk_mq_hw_sysfs_poll_show(struct blk_mq_hw_ctx *hctx, char *page)
hctx->poll_success);
}
static ssize_t blk_mq_hw_sysfs_poll_store(struct blk_mq_hw_ctx *hctx,
const char *page, size_t size)
{
hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
return size;
}
static ssize_t blk_mq_hw_sysfs_queued_show(struct blk_mq_hw_ctx *hctx,
char *page)
{
@ -303,8 +311,9 @@ static struct blk_mq_hw_ctx_sysfs_entry blk_mq_hw_sysfs_cpus = {
.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 },
.attr = {.name = "io_poll", .mode = S_IWUSR | S_IRUGO },
.show = blk_mq_hw_sysfs_poll_show,
.store = blk_mq_hw_sysfs_poll_store,
};
static struct attribute *default_hw_ctx_attrs[] = {