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Subject[PATCH v3 03/11] block-throttle: configure bps/iops limit for cgroup in high limit
Date
each queue will have a state machine. Initially queue is in LIMIT_HIGH
state, which means all cgroups will be throttled according to their high
limit. After all cgroups with high limit cross the limit, the queue state
gets upgraded to LIMIT_MAX state.
cgroups without high limit will use max limit for their high limit.

Signed-off-by: Shaohua Li <shli@fb.com>
---
block/blk-throttle.c | 21 +++++++++++++++++++--
1 file changed, 19 insertions(+), 2 deletions(-)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index 59d4b4c..e2b3704 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -208,12 +208,29 @@ static struct throtl_data *sq_to_td(struct throtl_service_queue *sq)

static uint64_t tg_bps_limit(struct throtl_grp *tg, int rw)
{
- return tg->bps[rw][tg->td->limit_index];
+ struct blkcg_gq *blkg = tg_to_blkg(tg);
+ uint64_t ret;
+
+ if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)
+ return -1;
+ ret = tg->bps[rw][tg->td->limit_index];
+ if (ret == -1 && tg->td->limit_index == LIMIT_HIGH)
+ return tg->bps[rw][LIMIT_MAX];
+
+ return ret;
}

static unsigned int tg_iops_limit(struct throtl_grp *tg, int rw)
{
- return tg->iops[rw][tg->td->limit_index];
+ struct blkcg_gq *blkg = tg_to_blkg(tg);
+ unsigned int ret;
+
+ if (cgroup_subsys_on_dfl(io_cgrp_subsys) && !blkg->parent)
+ return -1;
+ ret = tg->iops[rw][tg->td->limit_index];
+ if (ret == -1 && tg->td->limit_index == LIMIT_HIGH)
+ return tg->iops[rw][LIMIT_MAX];
+ return ret;
}

/**
--
2.9.3
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