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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2020-03-25 16:07:08 +0300
committerJens Axboe <axboe@kernel.dk>2020-03-25 08:49:12 -0600
commit8cd5b8fc00716fb71f6b32d594b38a8f286d6c20 (patch)
treeec3faf2ab2c492b620cbae8cdfd040776b2a47f3 /block/genhd.c
parentea18e0f0a63af9064db3d4065d90fa743ae0991b (diff)
block/diskstats: replace time_in_queue with sum of request times
Column "time_in_queue" in diskstats is supposed to show total waiting time of all requests. I.e. value should be equal to the sum of times from other columns. But this is not true, because column "time_in_queue" is counted separately in jiffies rather than in nanoseconds as other times. This patch removes redundant counter for "time_in_queue" and shows total time of read, write, discard and flush requests. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
-rw-r--r--block/genhd.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/block/genhd.c b/block/genhd.c
index 9eb981f7e5a4..792356e922a1 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -110,7 +110,6 @@ static void part_stat_read_all(struct hd_struct *part, struct disk_stats *stat)
}
stat->io_ticks += ptr->io_ticks;
- stat->time_in_queue += ptr->time_in_queue;
}
}
#else /* CONFIG_SMP */
@@ -1265,7 +1264,11 @@ ssize_t part_stat_show(struct device *dev,
(unsigned int)div_u64(stat.nsecs[STAT_WRITE], NSEC_PER_MSEC),
inflight,
jiffies_to_msecs(stat.io_ticks),
- jiffies_to_msecs(stat.time_in_queue),
+ (unsigned int)div_u64(stat.nsecs[STAT_READ] +
+ stat.nsecs[STAT_WRITE] +
+ stat.nsecs[STAT_DISCARD] +
+ stat.nsecs[STAT_FLUSH],
+ NSEC_PER_MSEC),
stat.ios[STAT_DISCARD],
stat.merges[STAT_DISCARD],
(unsigned long long)stat.sectors[STAT_DISCARD],
@@ -1559,7 +1562,11 @@ static int diskstats_show(struct seq_file *seqf, void *v)
NSEC_PER_MSEC),
inflight,
jiffies_to_msecs(stat.io_ticks),
- jiffies_to_msecs(stat.time_in_queue),
+ (unsigned int)div_u64(stat.nsecs[STAT_READ] +
+ stat.nsecs[STAT_WRITE] +
+ stat.nsecs[STAT_DISCARD] +
+ stat.nsecs[STAT_FLUSH],
+ NSEC_PER_MSEC),
stat.ios[STAT_DISCARD],
stat.merges[STAT_DISCARD],
stat.sectors[STAT_DISCARD],