fix(iolatency): attach freeze_queue probe on renamed kernel symbol#270
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June 23, 2026 20:00
…ction Pure move so it can be reused by collectors outside cmd/iotracing (which is package main and cannot be imported). Signed-off-by: Li Nan <magiclinan@didiglobal.com>
Commit 1e1a9cecfab3 ("block: force noio scope in blk_mq_freeze_queue")
turned blk_mq_freeze_queue into a static inline wrapper in v6.15; the
attachable symbol is blk_mq_freeze_queue_nomemsave. Pick the one the
kernel exposes via available_filter_functions at runtime.
Signed-off-by: Li Nan <magiclinan@didiglobal.com>
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Fix error below:
https://github.com/ccfos/huatuo/actions/runs/27772719794/job/82176711814?pr=248#step:6:3131
error message:
time="2026-06-18T16:18:23.194547490Z" level="error" msg="start tracing iolatency: attach kprobe: can't attach kprobe blk_mq_freeze_queue in Kprobe(kprobe_freeze_queue)#220: creating perf_kprobe PMU (arch-specific fallback for "blk_mq_freeze_queue"): token __x64_blk_mq_freeze_queue: not found: no such file or directory" file="tracing.go:88" func="huatuo-bamai/pkg/tracing.(*EventTracing).doStart"