linux-kernel - Re: [PATCH v8 04/23] slab: add sheaf support for batching kfree

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Message-ID: <ad9c6f4d-42de-4251-ab10-579feec7e8d1@nvidia.com>
Date: Fri, 28 Nov 2025 08:57:28 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Harry Yoo <harry.yoo@...cle.com>
Cc: Daniel Gomez <da.gomez@...nel.org>, Vlastimil Babka <vbabka@...e.cz>,
 Suren Baghdasaryan <surenb@...gle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Christoph Lameter <cl@...two.org>, David Rientjes <rientjes@...gle.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Uladzislau Rezki <urezki@...il.com>,
 Sidhartha Kumar <sidhartha.kumar@...cle.com>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
 maple-tree@...ts.infradead.org, linux-modules@...r.kernel.org,
 Luis Chamberlain <mcgrof@...nel.org>, Petr Pavlu <petr.pavlu@...e.com>,
 Sami Tolvanen <samitolvanen@...gle.com>, Aaron Tomlin <atomlin@...mlin.com>,
 Lucas De Marchi <lucas.demarchi@...el.com>,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v8 04/23] slab: add sheaf support for batching kfree_rcu()
 operations

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
Jon

-- 
nvpublic