diff options
| author | Breno Leitao <leitao@debian.org> | 2026-03-05 08:15:39 -0800 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-03-05 07:27:48 -1000 |
| commit | e8e14ac7cfe437b896838e7f7d07c573965b4e4e (patch) | |
| tree | 3960fd8278b437a8c6fdc83c0416e4d439eb6546 /kernel/workqueue_internal.h | |
| parent | 6037160e52d72028da68546fd270a7dcac130d85 (diff) | |
workqueue: Show in-flight work item duration in stall diagnostics
When diagnosing workqueue stalls, knowing how long each in-flight work
item has been executing is valuable. Add a current_start timestamp
(jiffies) to struct worker, set it when a work item begins execution in
process_one_work(), and print the elapsed wall-clock time in show_pwq().
Unlike current_at (which tracks CPU runtime and resets on wakeup for
CPU-intensive detection), current_start is never reset because the
diagnostic cares about total wall-clock time including sleeps.
Before: in-flight: 165:stall_work_fn [wq_stall]
After: in-flight: 165:stall_work_fn [wq_stall] for 100s
Signed-off-by: Breno Leitao <leitao@debian.org>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/workqueue_internal.h')
| -rw-r--r-- | kernel/workqueue_internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/workqueue_internal.h b/kernel/workqueue_internal.h index f6275944ada7..8def1ddc5a1b 100644 --- a/kernel/workqueue_internal.h +++ b/kernel/workqueue_internal.h @@ -32,6 +32,7 @@ struct worker { work_func_t current_func; /* K: function */ struct pool_workqueue *current_pwq; /* K: pwq */ u64 current_at; /* K: runtime at start or last wakeup */ + unsigned long current_start; /* K: start time of current work item */ unsigned int current_color; /* K: color */ int sleeping; /* S: is worker sleeping? */ |