From: Feng Tang <feng.tang@intel.com>
To: Borislav Petkov <bp@alien8.de>
Cc: Andrew Morton <akpm@linux-foundation.org>,
"V, Narasimhan" <Narasimhan.V@amd.com>,
"linux-next@vger.kernel.org" <linux-next@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"Aithal, Srikanth" <Srikanth.Aithal@amd.com>,
Dawei Li <dawei.li@shingroup.cn>,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Yury Norov <yury.norov@gmail.com>,
lkml <linux-kernel@vger.kernel.org>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: Boot failure with kernel BUG at mm/usercopy.c on next-20240325
Date: Tue, 26 Mar 2024 10:30:10 +0800 [thread overview]
Message-ID: <ZgIzMqiZzqUmqEOZ@feng-clx.sh.intel.com> (raw)
In-Reply-To: <20240325203714.GJZgHgem2TR1aVAVlU@fat_crate.local>
Add Vlastimil for slab related topic.
On Tue, Mar 26, 2024 at 04:37:14AM +0800, Borislav Petkov wrote:
> On Mon, Mar 25, 2024 at 11:34:33AM -0700, Andrew Morton wrote:
> > Thanks, I'll just drop the patch. It didn't receive a very favorable
> > review reception anyway.
>
> See here:
>
> https://lore.kernel.org/all/DM4PR12MB5086B9BDBF32D53DF226CBF489362@DM4PR12MB5086.namprd12.prod.outlook.com/
>
> folks still need to learn email. :-)
>
> Anyway, apparently there's some fix there.
The original commit 328c801335d5 ("cpumask: create dedicated kmem
cache for cpumask var") has some benefit, that there are CPU numbers
which are not power of 8, like 144, 288 etc where it will save
some memory.
And 'slabtop' on a qemu-VM with 16 cpus shows it is surprisingly
non-trivial and has the third largest number of objects:
22350 22350 100% 0.13K 745 30 2980K kernfs_node_cache
11172 10693 0% 0.19K 266 42 2128K dentry
10240 8222 0% 0.01K 20 512 80K cpumask
Andrew, if it is worth merging, you can folder my fix into the patch.
Thanks,
Feng
> Thx.
>
> --
> Regards/Gruss,
> Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette
>
next prev parent reply other threads:[~2024-03-26 2:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-25 12:40 Boot failure with kernel BUG at mm/usercopy.c on next-20240325 V, Narasimhan
2024-03-25 12:50 ` Borislav Petkov
2024-03-25 18:34 ` Andrew Morton
2024-03-25 20:37 ` Borislav Petkov
2024-03-26 2:30 ` Feng Tang [this message]
2024-03-26 19:56 ` Andrew Morton
2024-03-25 15:28 ` Feng Tang
2024-03-25 17:48 ` V, Narasimhan
-- strict thread matches above, loose matches on Subject: below --
2024-03-25 12:36 V, Narasimhan
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