blkio: Increment the blkio cgroup stats for real now
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<dpshah@google.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index ad6843f..9af7257 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -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 @@
}
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 @@
}
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 @@
#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[] = {