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blk-iocost: charge zone appends as writes

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Zone append is a primary write operation for zoned devices; zoned xfs
and btrfs use it for data writes.  It is priced at zero, so the zone
append portion of zoned workloads runs outside the controller: a
1%-weight cgroup issued 16000 appends at zero cost on a zoned null_blk.

Treat REQ_OP_ZONE_APPEND the same as REQ_OP_WRITE so it goes through
the existing seq/rand classification and charging.

Fixes: 0512a75b98 ("block: Introduce REQ_OP_ZONE_APPEND")
Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://patch.msgid.link/20260922043856.2020116-3-cui.tao@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tao Cui 2026-09-22 12:38:54 +08:00 committed by Jens Axboe
parent f8bc5c74d9
commit febdbf5682
1 changed files with 1 additions and 0 deletions
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block/blk-iocost.c
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@ -2557,6 +2557,7 @@ static void calc_vtime_cost_builtin(struct bio *bio, struct ioc_gq *iocg,
coef_randio = ioc->params.lcoefs[LCOEF_RRANDIO];
coef_page = ioc->params.lcoefs[LCOEF_RPAGE];
break;
case REQ_OP_ZONE_APPEND:
case REQ_OP_WRITE:
coef_seqio = ioc->params.lcoefs[LCOEF_WSEQIO];
coef_randio = ioc->params.lcoefs[LCOEF_WRANDIO];