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authorBoris Burkov2020-06-01 13:12:05 -0700
committerJens Axboe2020-07-17 20:18:00 -0600
commitef45fe470e1e5410db4af87abc5d5055427945ac (patch)
tree04e0ebe3aab3388aaffab326991e46c407977b8f /Documentation/admin-guide/cgroup-v2.rst
parentcd1fc4b98fb5953a220d690d45b11470fd9325d6 (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 'Documentation/admin-guide/cgroup-v2.rst')
-rw-r--r--Documentation/admin-guide/cgroup-v2.rst3
1 files changed, 1 insertions, 2 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index ce3e05e41724..2d7c5907e0ce 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -1483,8 +1483,7 @@ IO Interface Files
~~~~~~~~~~~~~~~~~~
io.stat
- A read-only nested-keyed file which exists on non-root
- cgroups.
+ A read-only nested-keyed file.
Lines are keyed by $MAJ:$MIN device numbers and not ordered.
The following nested keys are defined.