[PATCH v8 04/23] slab: add sheaf support for batching kfree_rcu() operations

[Harry Yoo]

On Fri, Nov 28, 2025 at 08:57:28AM +0000, Jon Hunter wrote:
> 
> On 27/11/2025 12:48, Harry Yoo wrote:
> 
> ...
> 
> > > > I have been looking into a regression for Linux v6.18-rc where time taken to
> > > > run some internal graphics tests on our Tegra234 device has increased from
> > > > around 35% causing the tests to timeout. Bisect is pointing to this commit
> > > > and I also see we have CONFIG_KVFREE_RCU_BATCHED=y.
> > > 
> > > Thanks for reporting! Uh, this has been put aside while I was busy working
> > > on other stuff... but now that we have two people complaining about this,
> > > I'll allocate some time to investigate and improve it.
> > > 
> > > It'll take some time though :)
> > 
> > By the way, how many CPUs do you have on your system, and does your
> > kernel have CONFIG_CODE_TAGGING enabled?
> 
> For this device there are 12 CPUs. I don't see CONFIG_CODE_TAGGING enabled.

Thanks! Then it's probably due to kmem_cache_destroy().
Please let me know this patch improves your test execution time.

https://lore.kernel.org/linux-mm/20251128113740.90129-1-harry.yoo@oracle.com/

-- 
Cheers,
Harry / Hyeonggon