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Subject[PATCH 3/3] blkio: Increment the blkio cgroup stats for real now
Date
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>
---

block/blk-cgroup.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++--
block/blk-cgroup.h | 14 +++++++++--
block/blk-core.c | 6 +++--
block/cfq-iosched.c | 4 ++-
include/linux/blkdev.h | 20 +++++++++++++++-
5 files changed, 95 insertions(+), 9 deletions(-)

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 @@ 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[] = {
diff --git a/block/blk-cgroup.h b/block/blk-cgroup.h
index 5c5e529..80010ef 100644
--- a/block/blk-cgroup.h
+++ b/block/blk-cgroup.h
@@ -112,12 +112,12 @@ static inline char *blkg_path(struct blkio_group *blkg)
{
return blkg->path;
}
-void blkiocg_update_blkio_group_dequeue_stats(struct blkio_group *blkg,
+void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
unsigned long dequeue);
#else
static inline char *blkg_path(struct blkio_group *blkg) { return NULL; }
-static inline void blkiocg_update_blkio_group_dequeue_stats(
- struct blkio_group *blkg, unsigned long dequeue) {}
+static inline void blkiocg_update_dequeue_stats(struct blkio_group *blkg,
+ unsigned long dequeue) {}
#endif

#if defined(CONFIG_BLK_CGROUP) || defined(CONFIG_BLK_CGROUP_MODULE)
@@ -130,6 +130,10 @@ extern struct blkio_group *blkiocg_lookup_group(struct blkio_cgroup *blkcg,
void *key);
void blkiocg_update_timeslice_used(struct blkio_group *blkg,
unsigned long time);
+void blkiocg_update_request_dispatch_stats(struct blkio_group *blkg,
+ struct request *rq);
+void blkiocg_update_request_completion_stats(struct blkio_group *blkg,
+ struct request *rq);
#else
struct cgroup;
static inline struct blkio_cgroup *
@@ -147,5 +151,9 @@ static inline struct blkio_group *
blkiocg_lookup_group(struct blkio_cgroup *blkcg, void *key) { return NULL; }
static inline void blkiocg_update_timeslice_used(struct blkio_group *blkg,
unsigned long time) {}
+static inline void blkiocg_update_request_dispatch_stats(
+ struct blkio_group *blkg, struct request *rq) {}
+static inline void blkiocg_update_request_completion_stats(
+ struct blkio_group *blkg, struct request *rq) {}
#endif
#endif /* _BLK_CGROUP_H */
diff --git a/block/blk-core.c b/block/blk-core.c
index 9fe174d..1d94f15 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -127,6 +127,7 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
rq->tag = -1;
rq->ref_count = 1;
rq->start_time = jiffies;
+ set_start_time_ns(rq);
}
EXPORT_SYMBOL(blk_rq_init);

@@ -1855,8 +1856,10 @@ void blk_dequeue_request(struct request *rq)
* and to it is freed is accounted as io that is in progress at
* the driver side.
*/
- if (blk_account_rq(rq))
+ if (blk_account_rq(rq)) {
q->in_flight[rq_is_sync(rq)]++;
+ set_io_start_time_ns(rq);
+ }
}

/**
@@ -2517,4 +2520,3 @@ int __init blk_dev_init(void)

return 0;
}
-
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d91df9f..5de0e54 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -854,7 +854,7 @@ cfq_group_service_tree_del(struct cfq_data *cfqd, struct cfq_group *cfqg)
if (!RB_EMPTY_NODE(&cfqg->rb_node))
cfq_rb_erase(&cfqg->rb_node, st);
cfqg->saved_workload_slice = 0;
- blkiocg_update_blkio_group_dequeue_stats(&cfqg->blkg, 1);
+ blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
}

static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq)
@@ -1864,6 +1864,7 @@ static void cfq_dispatch_insert(struct request_queue *q, struct request *rq)
elv_dispatch_sort(q, rq);

cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++;
+ blkiocg_update_request_dispatch_stats(&cfqq->cfqg->blkg, rq);
}

/*
@@ -3284,6 +3285,7 @@ static void cfq_completed_request(struct request_queue *q, struct request *rq)
WARN_ON(!cfqq->dispatched);
cfqd->rq_in_driver--;
cfqq->dispatched--;
+ blkiocg_update_request_completion_stats(&cfqq->cfqg->blkg, rq);

cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ebd22db..c793019 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -193,7 +193,10 @@ struct request {

struct gendisk *rq_disk;
unsigned long start_time;
-
+#ifdef CONFIG_BLK_CGROUP
+ unsigned long long start_time_ns;
+ unsigned long long io_start_time_ns; /* when passed to hardware */
+#endif
/* Number of scatter-gather DMA addr+len pairs after
* physical address coalescing is performed.
*/
@@ -1219,6 +1222,21 @@ static inline void put_dev_sector(Sector p)
struct work_struct;
int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);

+#ifdef CONFIG_BLK_CGROUP
+static inline void set_start_time_ns(struct request *req)
+{
+ req->start_time_ns = sched_clock();
+}
+
+static inline void set_io_start_time_ns(struct request *req)
+{
+ req->io_start_time_ns = sched_clock();
+}
+#else
+static inline void set_start_time_ns(struct request *req) {}
+static inline void set_io_start_time_ns(struct request *req) {}
+#endif
+
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \


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