diff options
| author | Boris Burkov <boris@bur.io> | 2020-06-01 13:12:05 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-07-17 20:18:00 -0600 |
| commit | ef45fe470e1e5410db4af87abc5d5055427945ac (patch) | |
| tree | 04e0ebe3aab3388aaffab326991e46c407977b8f /block/genhd.c | |
| parent | cd1fc4b98fb5953a220d690d45b11470fd9325d6 (diff) | |
blk-cgroup: show global disk stats in root cgroup io.stat
In order to improve consistency and usability in cgroup stat accounting,
we would like to support the root cgroup's io.stat.
Since the root cgroup has processes doing io even if the system has no
explicitly created cgroups, we need to be careful to avoid overhead in
that case. For that reason, the rstat algorithms don't handle the root
cgroup, so just turning the file on wouldn't give correct statistics.
To get around this, we simulate flushing the iostat struct by filling it
out directly from global disk stats. The result is a root cgroup io.stat
file consistent with both /proc/diskstats and io.stat.
Note that in order to collect the disk stats, we needed to iterate over
devices. To facilitate that, we had to change the linkage of a disk_type
to external so that it can be used from blk-cgroup.c to iterate over
disks.
Suggested-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Boris Burkov <boris@bur.io>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/genhd.c')
| -rw-r--r-- | block/genhd.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/block/genhd.c b/block/genhd.c index c42a49f2f537..8b1e9f48957c 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -38,8 +38,6 @@ static struct kobject *block_depr; static DEFINE_SPINLOCK(ext_devt_lock); static DEFINE_IDR(ext_devt_idr); -static const struct device_type disk_type; - static void disk_check_events(struct disk_events *ev, unsigned int *clearing_ptr); static void disk_alloc_events(struct gendisk *disk); @@ -1587,7 +1585,7 @@ static char *block_devnode(struct device *dev, umode_t *mode, return NULL; } -static const struct device_type disk_type = { +const struct device_type disk_type = { .name = "disk", .groups = disk_attr_groups, .release = disk_release, |