From: Andrew Morton <akpm@linux-foundation.org>
To: Feng Tang <feng.tang@intel.com>
Cc: Borislav Petkov <bp@alien8.de>,
"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 12:56:23 -0700 [thread overview]
Message-ID: <20240326125623.266550b81bb36aafc9a2c613@linux-foundation.org> (raw)
In-Reply-To: <ZgIzMqiZzqUmqEOZ@feng-clx.sh.intel.com>
On Tue, 26 Mar 2024 10:30:10 +0800 Feng Tang <feng.tang@intel.com> wrote:
> 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.
I'll await a resend, please.
next prev parent reply other threads:[~2024-03-26 19:56 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
2024-03-26 19:56 ` Andrew Morton [this message]
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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