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| author |   Tejun Heo <tj@kernel.org> | 2020-09-01 14:52:35 -0400 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2020-09-01 19:38:31 -0600 |
| commit | db84a72af6be422abf2089a5896293590dda5066 (patch) | |
| tree | 015107e8a4c471aa1fd872043d096ea39c835617 /block/blk-iocost.c | |
| parent | blk-iocost: rename propagate_active_weights() to propagate_weights() (diff) | |
| download | linux-dev-db84a72af6be422abf2089a5896293590dda5066.tar.xz linux-dev-db84a72af6be422abf2089a5896293590dda5066.zip | |
blk-iocost: clamp inuse and skip noops in __propagate_weights()
__propagate_weights() currently expects the callers to clamp inuse within
[1, active], which is needlessly fragile. The inuse adjustment logic is
going to be revamped, in preparation, let's make __propagate_weights() clamp
inuse on entry.
Also, make it avoid weight updates altogether if neither active or inuse is
changed.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-iocost.c')
| -rw-r--r-- | block/blk-iocost.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/block/blk-iocost.c b/block/blk-iocost.c index 78e6919153d8..8dfe73dde2a8 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -897,7 +897,10 @@ static void __propagate_weights(struct ioc_gq *iocg, u32 active, u32 inuse) lockdep_assert_held(&ioc->lock); - inuse = min(active, inuse); + inuse = clamp_t(u32, inuse, 1, active); + + if (active == iocg->active && inuse == iocg->inuse) + return; for (lvl = iocg->level - 1; lvl >= 0; lvl--) { struct ioc_gq *parent = iocg->ancestors[lvl]; |