linux-kernel - Re: [PATCH v6 02/10] slab: add opt-in caching layer of percpu sheaves

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Message-ID: <3aef893d-1218-4d98-b340-7300b74e9a60@leemhuis.info>
Date: Fri, 29 Aug 2025 09:12:19 +0200
From: Thorsten Leemhuis <linux@...mhuis.info>
To: 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>
Cc: Roman Gushchin <roman.gushchin@...ux.dev>,
 Harry Yoo <harry.yoo@...cle.com>, Uladzislau Rezki <urezki@...il.com>,
 linux-mm@...ck.org, linux-kernel@...r.kernel.org, rcu@...r.kernel.org,
 maple-tree@...ts.infradead.org,
 Linux Next Mailing List <linux-next@...r.kernel.org>,
 Stephen Rothwell <sfr@...b.auug.org.au>,
 Alexei Starovoitov <alexei.starovoitov@...il.com>,
 Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
 Bert Karwatzki <spasswolf@....de>
Subject: Re: [PATCH v6 02/10] slab: add opt-in caching layer of percpu sheaves

On 28.08.25 17:00, Vlastimil Babka wrote:
> On 8/28/25 10:01, Vlastimil Babka wrote:
>> On 8/28/25 09:43, Thorsten Leemhuis wrote:
>>> On 27.08.25 10:26, Vlastimil Babka wrote:
>>>> Specifying a non-zero value for a new struct kmem_cache_args field
>>>> sheaf_capacity will setup a caching layer of percpu arrays called
>>>> sheaves of given capacity for the created cache.
>>>> [...]
>>>
>>> This patch showed up in linux-next today and from a *quick* glance at
>>> things I suspect it might be the reason why my daily next rpm builds for
>>> Fedora failed today like this:
>>
>> Hi, thanks for the report.
> [...]
>>> Full log: https://download.copr.fedorainfracloud.org/results/@kernel-vanilla/next/fedora-rawhide-x86_64/09498568-next-next-all/builder-live.log.gz
>>
>> Oh so I assume the .config here has both LOCKDEP and PREEMPT_RT?
>> I tried to make lockdep_assert_held() with trylock but forgot about the RT
>> difference. The solution is Alexei's patch
>>
>> https://lore.kernel.org/all/20250718021646.73353-2-
>> alexei.starovoitov@...il.com/
>>
>> Wonder if I can just fast-track it to here from that series?
> 
> Did that for tomorrow's -next

Thx, today's -next build worked smoothly! Ciao, Thorsten