diff options
| author | Wladislav Wiebe <wladislav.wiebe@nokia.com> | 2025-08-04 11:35:25 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2025-09-03 16:10:40 +0200 |
| commit | 673f1244b3d47c9b41cda3473c062bec586387be (patch) | |
| tree | 7e6bb3bf68f7f6ea0c1662a20168d01677005f40 /Documentation/admin-guide/kernel-parameters.txt | |
| parent | 55b48e23f5c4b6f5ca9b7ab09599b17dcf501c10 (diff) | |
genirq: Add support for warning on long-running interrupt handlers
Introduce a mechanism to detect and warn about prolonged interrupt handlers.
With a new command-line parameter (irqhandler.duration_warn_us=), users can
configure the duration threshold in microseconds when a warning in such
format should be emitted:
"[CPU14] long duration of IRQ[159:bad_irq_handler [long_irq]], took: 1330 us"
The implementation uses local_clock() to measure the execution duration of the
generic IRQ per-CPU event handler.
Signed-off-by: Wladislav Wiebe <wladislav.wiebe@nokia.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/all/20250804093525.851-1-wladislav.wiebe@nokia.com
Diffstat (limited to 'Documentation/admin-guide/kernel-parameters.txt')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 747a55abf494..bdbc44f52e4a 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -2606,6 +2606,11 @@ for it. Intended to get systems with badly broken firmware running. + irqhandler.duration_warn_us= [KNL] + Warn if an IRQ handler exceeds the specified duration + threshold in microseconds. Useful for identifying + long-running IRQs in the system. + irqpoll [HW] When an interrupt is not handled search all handlers for it. Also check all handlers each timer |