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| author | Tejun Heo <tj@kernel.org> | 2015-08-18 14:55:36 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2015-08-18 15:49:36 -0700 |
| commit | 69d7fde5909b614114343974cfc52cb8ff30b544 (patch) | |
| tree | 231d68d331b286767109c616823781ed030ecb2b /Documentation/cgroups | |
| parent | 3ecca62931ee6a30822a1ab7299bc8b8a21e5288 (diff) | |
| download | lwn-69d7fde5909b614114343974cfc52cb8ff30b544.tar.gz lwn-69d7fde5909b614114343974cfc52cb8ff30b544.zip | |
blkcg: use CGROUP_WEIGHT_* scale for io.weight on the unified hierarchy
cgroup is trying to make interface consistent across different
controllers. For weight based resource control, the knob should have
the range [1, 10000] and default to 100. This patch updates
cfq-iosched so that the weight range conforms. The internal
calculations have enough range and the widening of the weight range
shouldn't cause any problem.
* blkcg_policy->cpd_bind_fn() is added. If present, this is invoked
when blkcg is attached to a hierarchy.
* cfq_cpd_init() is updated to use the new default value on the
unified hierarchy.
* cfq_cpd_bind() callback is implemented to clear per-blkg configs and
apply the default config matching the hierarchy type.
* cfqd->root_group->[leaf_]weight initialization in cfq_init_queue()
is moved into !CONFIG_CFQ_GROUP_IOSCHED block. cfq_cpd_bind() is
now responsible for initializing the initial weights when blkcg is
enabled.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Arianna Avanzini <avanzini.arianna@gmail.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'Documentation/cgroups')
| -rw-r--r-- | Documentation/cgroups/unified-hierarchy.txt | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/cgroups/unified-hierarchy.txt b/Documentation/cgroups/unified-hierarchy.txt index bd1ce15d5178..e0975c2cf03d 100644 --- a/Documentation/cgroups/unified-hierarchy.txt +++ b/Documentation/cgroups/unified-hierarchy.txt @@ -464,7 +464,7 @@ may be specified in any order and not all pairs have to be specified. The weight setting, currently only available and effective if cfq-iosched is in use for the target device. The weight is - between 10 and 1000 and defaults to 500. The first line + between 1 and 10000 and defaults to 100. The first line always contains the default weight in the following format to use when per-device setting is missing. |