Re: [patch 0/3] lib: add synthetic MM benchmarks

["David Hildenbrand (Arm)" <david@kernel.org>]

On 7/31/26 06:26, David Rientjes wrote:
> A blast to the past :)
> 

:)

> We've been carrying these synthetic benchmarks in our kernel tree since 
> 2009 because they've been helpful to identify regressions in hot paths, as 
> well as quantifying any improvements that have been made for new changes.  
> Hopefully they can be useful to others as well.
> 
> The synthetic benchmarks are run by loading the module at runtime.  The 
> modprobe will fail intentionally so that the module gets insta-unloaded.  
> The test results are emitted to the kernel log.


Ideally we'd have an easy way to actually use them in autoamtic tests.

E.g., loading fails -> error, loading works -> no error (and unload)

> 
> Proposed with permission from Christoph.
> ---
>  lib/Kconfig.debug    |  30 ++++
>  lib/Makefile         |   3 +
>  lib/test_pagealloc.c | 337 ++++++++++++++++++++++++++++++++++++++
>  lib/test_slab.c      | 375 +++++++++++++++++++++++++++++++++++++++++++
>  lib/test_vmstat.c    |  95 +++++++++++
>  5 files changed, 840 insertions(+)
>  create mode 100644 lib/test_pagealloc.c
>  create mode 100644 lib/test_slab.c
>  create mode 100644 lib/test_vmstat.c

This looks similar to tools/testing/selftests/mm/test_vmalloc.sh and friends,
that can actually be executed as part of our selftests and do a modprobe.

Can we have similar scripts to execute them?

But I also wonder if these test modules could be placed then in
tools/testing/selftests/mm/ instead (or some subdirectory for test modules).

Last but not least: MAINTAINERS should cover them.

-- 
Cheers,

David