From: Mark Brown <broonie@kernel.org>
To: Chengming Zhou <chengming.zhou@linux.dev>
Cc: vbabka@suse.cz, cl@linux.com, penberg@kernel.org,
rientjes@google.com, iamjoonsoo.kim@lge.com,
akpm@linux-foundation.org, roman.gushchin@linux.dev,
42.hyeyoo@gmail.com, linux-mm@kvack.org,
linux-kernel@vger.kernel.org,
Chengming Zhou <zhouchengming@bytedance.com>
Subject: Re: [PATCH v5 6/9] slub: Delay freezing of partial slabs
Date: Tue, 21 Nov 2023 01:29:56 +0000 [thread overview]
Message-ID: <ZVwIFNdABN1b+qWC@finisterre.sirena.org.uk> (raw)
In-Reply-To: <c8bb9dd9-ae18-4fab-a664-6ec4b0cb2e30@linux.dev>
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On Tue, Nov 21, 2023 at 08:58:40AM +0800, Chengming Zhou wrote:
> On 2023/11/21 02:49, Mark Brown wrote:
> > On Thu, Nov 02, 2023 at 03:23:27AM +0000, chengming.zhou@linux.dev wrote:
> > When we see problems we see RCU stalls while logging in, for example:
> > [ 46.453323] rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
> > [ 46.459361] rcu: 3-...0: (1 GPs behind) idle=def4/1/0x40000000 softirq=1304/1304 fqs=951
> > [ 46.467669] rcu: (detected by 0, t=2103 jiffies, g=1161, q=499 ncpus=4)
> > [ 46.474472] Sending NMI from CPU 0 to CPUs 3:
> IIUC, here should print the backtrace of CPU 3, right? It looks like CPU 3 is the cause,
> but we couldn't see what it's doing from the log.
AIUI yes, but it looks like we've just completely lost the CPU - there's
more attempts to talk to it visible in the log:
> > A full log for that run can be seen at:
> >
> > https://validation.linaro.org/scheduler/job/4017095
but none of them appear to cause CPU 3 to respond. Note that 32 bit ARM
is just using a regular IPI rather than something that's actually a NMI
so this isn't hugely out of the ordinary, I'd guess it's stuck with
interrupts masked.
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next prev parent reply other threads:[~2023-11-21 1:30 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-02 3:23 [PATCH v5 0/9] slub: Delay freezing of CPU " chengming.zhou
2023-11-02 3:23 ` [PATCH v5 1/9] slub: Reflow ___slab_alloc() chengming.zhou
2023-11-22 0:26 ` Hyeonggon Yoo
2023-11-02 3:23 ` [PATCH v5 2/9] slub: Change get_partial() interfaces to return slab chengming.zhou
2023-11-22 1:09 ` Hyeonggon Yoo
2023-11-02 3:23 ` [PATCH v5 3/9] slub: Keep track of whether slub is on the per-node partial list chengming.zhou
2023-11-22 1:21 ` Hyeonggon Yoo
2023-11-02 3:23 ` [PATCH v5 4/9] slub: Prepare __slab_free() for unfrozen partial slab out of node " chengming.zhou
2023-12-03 6:01 ` Hyeonggon Yoo
2023-11-02 3:23 ` [PATCH v5 5/9] slub: Introduce freeze_slab() chengming.zhou
2023-11-02 3:23 ` [PATCH v5 6/9] slub: Delay freezing of partial slabs chengming.zhou
2023-11-14 5:44 ` kernel test robot
2023-11-20 18:49 ` Mark Brown
2023-11-21 0:58 ` Chengming Zhou
2023-11-21 1:29 ` Mark Brown [this message]
2023-11-21 15:47 ` Chengming Zhou
2023-11-21 18:21 ` Mark Brown
2023-11-22 8:52 ` Vlastimil Babka
2023-11-22 9:37 ` Vlastimil Babka
2023-11-22 11:27 ` Mark Brown
2023-11-22 11:35 ` Chengming Zhou
2023-11-22 11:40 ` Vlastimil Babka
2023-11-22 11:54 ` Chengming Zhou
2023-11-22 13:19 ` Vlastimil Babka
2023-11-22 14:28 ` Chengming Zhou
2023-11-22 14:32 ` Vlastimil Babka
2023-12-03 6:53 ` Hyeonggon Yoo
2023-12-03 10:15 ` Chengming Zhou
2023-12-04 16:58 ` Vlastimil Babka
2023-11-02 3:23 ` [PATCH v5 7/9] slub: Optimize deactivate_slab() chengming.zhou
2023-12-03 9:23 ` Hyeonggon Yoo
2023-12-03 10:26 ` Chengming Zhou
2023-12-03 11:19 ` Hyeonggon Yoo
2023-12-03 11:47 ` Chengming Zhou
2023-12-04 17:55 ` Vlastimil Babka
2023-12-05 0:20 ` Hyeonggon Yoo
2023-11-02 3:23 ` [PATCH v5 8/9] slub: Rename all *unfreeze_partials* functions to *put_partials* chengming.zhou
2023-12-03 9:27 ` Hyeonggon Yoo
2023-11-02 3:23 ` [PATCH v5 9/9] slub: Update frozen slabs documentations in the source chengming.zhou
2023-12-03 9:47 ` Hyeonggon Yoo
2023-12-04 21:41 ` Christoph Lameter (Ampere)
2023-12-05 6:06 ` Chengming Zhou
2023-12-05 9:39 ` Vlastimil Babka
2023-11-13 8:36 ` [PATCH v5 0/9] slub: Delay freezing of CPU partial slabs Vlastimil Babka
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