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Subject[PATCH -next 4/5] blk-iocost: bypass if only one cgroup issues io
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From: Yu Kuai <yukuai3@huawei.com>

In this special case, there is no need to throttle io.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
block/blk-iocost.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/block/blk-iocost.c b/block/blk-iocost.c
index 5acc5f13bbd6..32e7e416d67c 100644
--- a/block/blk-iocost.c
+++ b/block/blk-iocost.c
@@ -2564,8 +2564,13 @@ static void ioc_rqos_throttle(struct rq_qos *rqos, struct bio *bio)
bool use_debt, ioc_locked;
unsigned long flags;

- /* bypass IOs if disabled, still initializing, or for root cgroup */
- if (!ioc->enabled || !iocg || !iocg->level)
+ /*
+ * bypass IOs if disabled, still initializing, for root cgroup,
+ * or the cgroup is the only cgroup with io.
+ */
+ if (!ioc->enabled || !iocg || !iocg->level ||
+ (iocg->hweight_inuse == WEIGHT_ONE &&
+ atomic_read(&ioc->hweight_gen) == iocg->hweight_gen))
return;

/* calculate the absolute vtime cost */
--
2.31.1
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