Re: [PATCH 2/3] workqueue: expose per-workqueue stats in debugfs

[Tejun Heo]

On Thu, Oct 22, 2026 at 03:53:35PM +0000, Wilson Felipe Pereira wrote:
> struct pool_workqueue tracks runtime counters in pwq->stats[],
> pwq->total_in_flight, and pwq->nr_active, but reading them currently
> requires tools/workqueue/wq_monitor.py with drgn and kernel DWARF
> debuginfo. This makes it impractical to inspect workqueue stats on
> systems without drgn or debug symbols.
> 
> Add /sys/kernel/debug/workqueue/stats to expose per-workqueue stats
> directly from the kernel. Iterate over the workqueues list under RCU and
> sum wq->retired_stats[] with each pwq's stats[], total_in_flight, and
> nr_active to report queued, active, and running work items alongside the
> cumulative pwq->stats[] counters.

This isn't really a justification. What do you use these numbers for? If
this is for live monitoring, why debugfs? If for debugging, what's wrong
with drgn?

Thanks.

-- 
tejun