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block/kyber-iosched: flush per-cpu latency buckets over possible CPUs

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kyber_timer_fn() sums the per-cpu latency histograms with
for_each_online_cpu().  A CPU that goes offline mid-interval leaves its
bucket un-flushed; the samples are lost from the current decision and
re-appear (stale) when the CPU is onlined again.

Fixes: 6e25cb01ea ("kyber: implement improved heuristics")
Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Reviewed-by: Yu Kuai <yukuai@fygo.io>
Link: https://patch.msgid.link/20260720093726.28965-5-cui.tao@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Tao Cui
2026-08-03 20:03:20 -06:00
committed by Jens Axboe
parent 4e050c5b92
commit 482fc257de
1 changed files with 1 additions and 1 deletions
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block/kyber-iosched.c
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@@ -275,7 +275,7 @@ static void kyber_timer_fn(struct timer_list *t)
bool bad = false;
/* Sum all of the per-cpu latency histograms. */
for_each_online_cpu(cpu) {
for_each_possible_cpu(cpu) {
struct kyber_cpu_latency *cpu_latency;
cpu_latency = per_cpu_ptr(kqd->cpu_latency, cpu);