Re: [patch v2] lib: test_vmstat: add synthetic benchmark for vm stats

[SJ Park <sj@kernel.org>]

On Fri, 21 Aug 2026 16:52:17 -0700 (PDT) David Rientjes <rientjes@google.com> wrote:

> On Fri, 7 Aug 2026, David Rientjes wrote:
> 
> > On Sun, 2 Aug 2026, David Rientjes wrote:
> > 
> > > From: Christoph Lameter <cl@gentwo.org>
> > > 
> > > Add a synthetic benchmark that can be used to measure performance of VM
> > > statistics.  This is used to analyze any improvements or regressions in
> > > functions that are frequently used in hot code paths.
> > > 
> > > The test is run by inserting the module: modprobe test_vmstat
> > > The module insertion will always fail so that it is automatically
> > > unloaded; the results are in the kernel log.
> > > 
> > > Signed-off-by: Christoph Lameter <cl@gentwo.org>
> > > Signed-off-by: David Rientjes <rientjes@google.com>
> > > ---
> > >  v2:
> > >   - added bash wrapper to ksft per David
> > >   - integrated into ksft
> > >   - added MAINTAINERS entry per David
> > >   - fixed alloc_page() error code per Usama
> > > 
> > >  Adding single test for now to solicit feedback before updating the other
> > >  two.
> > > 
> > 
> > Any feedback for this one?  If this one looks good then I can also apply 
> > the same treatment for test_pagealloc and test_slab.
> > 
> 
> Andrew, David, any thoughts on whether this one is acceptable for merge?  
> If this looks structually correct and is staged for inclusion, then I'll 
> do the same treatment to the other two proposed tests as well.

FWIW, I found a similar high level topics including whether performance tests
should be in the tree, and where tests should be added, are being discussed on
another thread [1].

[1] https://lore.kernel.org/aogrd9knfBUGH885@gremlin


Thanks,
SJ

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