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blk-throttle: pass the I/O counts of a dead group on

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The recursive io_service_bytes and io_serviced files sum up the online
groups plus what dead descendants left in aux_cnt. That worked while the
counters lived in the blkg. Since commit 7ca464383a they're in the
throtl_grp and nobody passes them up, so the files go backwards when a
child is removed. Add them to the parent in throtl_pd_offline().

Fixes: 7ca464383a ("blk-throtl: stop using blkg->stat_bytes and ->stat_ios")
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://patch.msgid.link/20261028164415.1262013-26-axboe@kernel.dk
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josef Bacik 2026-10-28 10:41:28 -06:00 committed by Jens Axboe
parent 020f61242d
commit 587edb931f
1 changed files with 12 additions and 1 deletions
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13
block/blk-throttle.c
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@ -1670,7 +1670,18 @@ static void tg_flush_bios(struct throtl_grp *tg)
static void throtl_pd_offline(struct blkg_policy_data *pd)
{
tg_flush_bios(pd_to_tg(pd));
struct throtl_grp *tg = pd_to_tg(pd);
struct throtl_grp *parent = blkg_to_tg(tg_to_blkg(tg)->parent);
tg_flush_bios(tg);
/* the recursive files of the ancestors go on counting what it did */
if (parent) {
blkg_rwstat_add_aux(&parent->stat_bytes, &tg->stat_bytes);
blkg_rwstat_add_aux(&parent->stat_ios, &tg->stat_ios);
blkg_rwstat_reset(&tg->stat_bytes);
blkg_rwstat_reset(&tg->stat_ios);
}
}
struct blkcg_policy blkcg_policy_throtl = {