From: Harry Yoo <harry.yoo@oracle.com>
To: Jon Hunter <jonathanh@nvidia.com>
Cc: Daniel Gomez <da.gomez@kernel.org>,
Vlastimil Babka <vbabka@suse.cz>,
Suren Baghdasaryan <surenb@google.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Christoph Lameter <cl@gentwo.org>,
David Rientjes <rientjes@google.com>,
Roman Gushchin <roman.gushchin@linux.dev>,
Uladzislau Rezki <urezki@gmail.com>,
Sidhartha Kumar <sidhartha.kumar@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
rcu@vger.kernel.org, maple-tree@lists.infradead.org,
linux-modules@vger.kernel.org,
Luis Chamberlain <mcgrof@kernel.org>,
Petr Pavlu <petr.pavlu@suse.com>,
Sami Tolvanen <samitolvanen@google.com>,
Aaron Tomlin <atomlin@atomlin.com>,
Lucas De Marchi <lucas.demarchi@intel.com>,
"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>
Subject: Re: [PATCH v8 04/23] slab: add sheaf support for batching kfree_rcu() operations
Date: Mon, 1 Dec 2025 15:55:58 +0900 [thread overview]
Message-ID: <aS07_pFAtVCsNIXd@hyeyoo> (raw)
In-Reply-To: <ad9c6f4d-42de-4251-ab10-579feec7e8d1@nvidia.com>
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
next prev parent reply other threads:[~2025-12-01 6:56 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250910-slub-percpu-caches-v8-0-ca3099d8352c@suse.cz>
[not found] ` <20250910-slub-percpu-caches-v8-4-ca3099d8352c@suse.cz>
[not found] ` <0406562e-2066-4cf8-9902-b2b0616dd742@kernel.org>
2025-11-27 11:38 ` [PATCH v8 04/23] slab: add sheaf support for batching kfree_rcu() operations Jon Hunter
2025-11-27 11:50 ` Jon Hunter
2025-11-27 12:33 ` Harry Yoo
2025-11-27 12:48 ` Harry Yoo
2025-11-28 8:57 ` Jon Hunter
2025-12-01 6:55 ` Harry Yoo [this message]
2025-11-27 13:18 ` Vlastimil Babka
2025-11-28 8:59 ` Jon Hunter
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