From: Tao Cui ioc_rqos_done() only accounts READ and WRITE completions, so zone append completions are excluded from the latency window: the vrate feedback loop cannot see ZA-induced latency, leaving it unable to respond to device saturation caused by zone appends. Similarly, calc_size_vtime_cost_builtin() does not classify zone append as a write operation. Charging (the cost model) and feedback (the latency window) are separate mechanisms, so this is not covered by the previous patch that prices zone appends. Treat zone append as WRITE for both latency accounting and cost classification. Fixes: 7caa47151ab2 ("blkcg: implement blk-iocost") Signed-off-by: Tao Cui --- block/blk-iocost.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/block/blk-iocost.c b/block/blk-iocost.c index d7860ec1ad49..1bf622e39ce4 100644 --- a/block/blk-iocost.c +++ b/block/blk-iocost.c @@ -2606,6 +2606,7 @@ static void calc_size_vtime_cost_builtin(struct request *rq, struct ioc *ioc, case REQ_OP_READ: *costp = pages * ioc->params.lcoefs[LCOEF_RPAGE]; break; + case REQ_OP_ZONE_APPEND: case REQ_OP_WRITE: *costp = pages * ioc->params.lcoefs[LCOEF_WPAGE]; break; @@ -2876,6 +2877,7 @@ static void ioc_rqos_done(struct rq_qos *rqos, struct request *rq) pidx = QOS_RLAT; rw = READ; break; + case REQ_OP_ZONE_APPEND: case REQ_OP_WRITE: pidx = QOS_WLAT; rw = WRITE; -- 2.43.0