Re: [PATCH] s390/spinlock: Add contention tracepoints to lock slowpath

[Vasily Gorbik <gor@linux.ibm.com>]

On Thu, Jul 23, 2026 at 10:42:29AM +0200, Ciunas Bennett wrote:
> Instrument arch_spin_lock_wait() with trace_contention_begin() and
> trace_contention_end().
> 
> These tracepoints are used by lock contention analysis tools such as
> perf lock contention to identify contended locks and measure wait times.
> Both the generic implementation and powerpc emit the same events from
> their spinlock slow path.
> 
> Place the tracepoints in arch_spin_lock_wait(), which is only entered
> when lock acquisition falls back to the contention path.
> 
> Signed-off-by: Ciunas Bennett <ciunas@linux.ibm.com>
> ---
>  arch/s390/lib/spinlock.c | 3 +++
>  1 file changed, 3 insertions(+)

Applied, thank you!