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blkio: Increment the blkio cgroup stats for real now

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We also add start_time_ns and io_start_time_ns fields to struct request
here to record the time when a request is created and when it is
dispatched to device. We use ns uints here as ms and jiffies are
not very useful for non-rotational media.

Signed-off-by: Divyesh Shah<[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Divyesh Shah 2010-04-01 15:01:41 -07:00 • committed by Jens Axboe
commit 9195291e5f
5 changed files with 95 additions and 9 deletions
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60
block/blk-cgroup.c
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@ -15,6 +15,7 @@
#include <linux/kdev_t.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/blkdev.h>
#include "blk-cgroup.h"
static DEFINE_SPINLOCK(blkio_list_lock);
@ -55,6 +56,26 @@ struct blkio_cgroup *cgroup_to_blkio_cgroup(struct cgroup *cgroup)
}
EXPORT_SYMBOL_GPL(cgroup_to_blkio_cgroup);
/*
* Add to the appropriate stat variable depending on the request type.
* This should be called with the blkg->stats_lock held.
*/
void io_add_stat(uint64_t *stat, uint64_t add, unsigned int flags)
{
if (flags & REQ_RW)
stat[IO_WRITE] += add;
else
stat[IO_READ] += add;
/*
* Everywhere in the block layer, an IO is treated as sync if it is a
* read or a SYNC write. We follow the same norm.
*/
if (!(flags & REQ_RW) || flags & REQ_RW_SYNC)
stat[IO_SYNC] += add;
else
stat[IO_ASYNC] += add;
}
void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time)
{
unsigned long flags;
@ -65,6 +86,41 @@ void blkiocg_update_timeslice_used(struct blkio_group *blkg, unsigned long time)
}
EXPORT_SYMBOL_GPL(blkiocg_update_timeslice_used);
void blkiocg_update_request_dispatch_stats(struct blkio_group *blkg,
struct request *rq)
{
struct blkio_group_stats *stats;
unsigned long flags;
spin_lock_irqsave(&blkg->stats_lock, flags);
stats = &blkg->stats;
stats->sectors += blk_rq_sectors(rq);
io_add_stat(stats->io_serviced, 1, rq->cmd_flags);
io_add_stat(stats->io_service_bytes, blk_rq_sectors(rq) << 9,
rq->cmd_flags);
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
void blkiocg_update_request_completion_stats(struct blkio_group *blkg,
struct request *rq)
{
struct blkio_group_stats *stats;
unsigned long flags;
unsigned long long now = sched_clock();
spin_lock_irqsave(&blkg->stats_lock, flags);
stats = &blkg->stats;
if (time_after64(now, rq->io_start_time_ns))
io_add_stat(stats->io_service_time, now - rq->io_start_time_ns,
rq->cmd_flags);
if (time_after64(rq->io_start_time_ns, rq->start_time_ns))
io_add_stat(stats->io_wait_time,
rq->io_start_time_ns - rq->start_time_ns,
rq->cmd_flags);
spin_unlock_irqrestore(&blkg->stats_lock, flags);
}
EXPORT_SYMBOL_GPL(blkiocg_update_request_completion_stats);
void blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
struct blkio_group *blkg, void *key, dev_t dev)
{
@ -325,12 +381,12 @@ SHOW_FUNCTION_PER_GROUP(dequeue, get_stat, get_dequeue_stat, 0);
#undef SHOW_FUNCTION_PER_GROUP
#ifdef CONFIG_DEBUG_BLK_CGROUP
void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
unsigned long dequeue)
{
blkg->stats.dequeue += dequeue;
}
EXPORT_SYMBOL_GPL(blkiocg_update_blkio_group_dequeue_stats);
EXPORT_SYMBOL_GPL(blkiocg_update_dequeue_stats);
#endif
struct cftype blkio_files[] = {