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Subject[PATCH -next v2 5/5] block, bfq: do not idle if only one cgroup is activated
Date
Now that root group is counted into 'num_groups_with_pending_reqs',
'num_groups_with_pending_reqs > 0' is always true in
bfq_asymmetric_scenario().

Thus change the condition to 'num_groups_with_pending_reqs > 1'.

On the other hand, now that 'num_groups_with_pending_reqs' represents
how many groups have pending requests, this change can enable concurrent
sync io is only on cgroup is activated.

Signed-off-by: Yu Kuai <yukuai3@huawei.com>
---
block/bfq-iosched.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index 39abcd95df8e..7d9f94882f8e 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -846,7 +846,7 @@ static bool bfq_asymmetric_scenario(struct bfq_data *bfqd,

return varied_queue_weights || multiple_classes_busy
#ifdef CONFIG_BFQ_GROUP_IOSCHED
- || bfqd->num_groups_with_pending_reqs > 0
+ || bfqd->num_groups_with_pending_reqs > 1
#endif
;
}
--
2.31.1
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