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authorKemeng Shi <shikemeng@huawei.com>2022-12-05 19:57:01 +0800
committerJens Axboe <axboe@kernel.dk>2022-12-05 13:44:19 -0700
commitf56019aef353576f43f945fdd065858145090582 (patch)
tree5f3755d3148105f2ba7a205f0a50fc60fffb3053 /block
parentb1476451488b32ce594c495122b96fd88489dc7d (diff)
blk-throttle: correct stale comment in throtl_pd_init
On the default hierarchy (cgroup2), the throttle interface files don't exist in the root cgroup, so the ablity to limit the whole system by configuring root group is not existing anymore. In general, cgroup doesn't wanna be in the business of restricting resources at the system level, so correct the stale comment that we can limit whole system to we can only limit subtree. Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Kemeng Shi <shikemeng@huawei.com> Link: https://lore.kernel.org/r/20221205115709.251489-2-shikemeng@huaweicloud.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-throttle.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 847721dc2b2b..8e2349b17936 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -395,8 +395,9 @@ static void throtl_pd_init(struct blkg_policy_data *pd)
* If on the default hierarchy, we switch to properly hierarchical
* behavior where limits on a given throtl_grp are applied to the
* whole subtree rather than just the group itself. e.g. If 16M
- * read_bps limit is set on the root group, the whole system can't
- * exceed 16M for the device.
+ * read_bps limit is set on a parent group, summary bps of
+ * parent group and its subtree groups can't exceed 16M for the
+ * device.
*
* If not on the default hierarchy, the broken flat hierarchy
* behavior is retained where all throtl_grps are treated as if