Re: [PATCH 2/2] selftests/mm: add zone->lock tracepoint verification test

[David Hildenbrand (Arm)]

On 5/8/26 18:22, hawk@xxxxxxxxxx wrote:
> From: Jesper Dangaard Brouer <hawk@xxxxxxxxxx>
> 
> Add a selftest to verify the kmem:mm_zone_lock_contended,
> kmem:mm_zone_locked, and kmem:mm_zone_lock_unlock tracepoints.
> 
> The test has two components:
> 
> zone_lock_contention.c - a workload that spawns threads doing rapid
> page allocation and freeing to generate zone->lock contention. It
> shrinks PCP lists via percpu_pagelist_high_fraction to force frequent
> free_pcppages_bulk() and rmqueue_bulk() calls.
> 
> test_zone_lock_tracepoints.sh - uses bpftrace to verify tracepoints
> exist, have the expected fields, fire under load, and that wait_ns
> is populated when contention occurs.
> 
> Signed-off-by: Jesper Dangaard Brouer <hawk@xxxxxxxxxx>
> ---
>  tools/testing/selftests/mm/Makefile           |   2 +
>  .../mm/test_zone_lock_tracepoints.sh          | 212 ++++++++++++++++++
>  .../selftests/mm/zone_lock_contention.c       | 166 ++++++++++++++

This really looks excessive and ... not really how we usually treat tracepoints?

I don't know about others, but I don't think this is really what we want as a MM
selftest.

-- 
Cheers,

David