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block: add sysfs file for controlling io stats accounting

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This allows us to turn off disk stat accounting completely, for the cases
where the 0.5-1% reduction in system time is important.

Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Jens Axboe 2009-01-23 10:54:44 +01:00
commit bc58ba9468
3 changed files with 88 additions and 36 deletions
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28
block/blk-sysfs.c
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@ -197,6 +197,27 @@ queue_rq_affinity_store(struct request_queue *q, const char *page, size_t count)
return ret;
}
static ssize_t queue_iostats_show(struct request_queue *q, char *page)
{
return queue_var_show(blk_queue_io_stat(q), page);
}
static ssize_t queue_iostats_store(struct request_queue *q, const char *page,
size_t count)
{
unsigned long stats;
ssize_t ret = queue_var_store(&stats, page, count);
spin_lock_irq(q->queue_lock);
if (stats)
queue_flag_set(QUEUE_FLAG_IO_STAT, q);
else
queue_flag_clear(QUEUE_FLAG_IO_STAT, 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,
@ -249,6 +270,12 @@ static struct queue_sysfs_entry queue_rq_affinity_entry = {
.store = queue_rq_affinity_store,
};
static struct queue_sysfs_entry queue_iostats_entry = {
.attr = {.name = "iostats", .mode = S_IRUGO | S_IWUSR },
.show = queue_iostats_show,
.store = queue_iostats_store,
};
static struct attribute *default_attrs[] = {
&queue_requests_entry.attr,
&queue_ra_entry.attr,
@ -259,6 +286,7 @@ static struct attribute *default_attrs[] = {
&queue_nonrot_entry.attr,
&queue_nomerges_entry.attr,
&queue_rq_affinity_entry.attr,
&queue_iostats_entry.attr,
NULL,
};