From: Xunlei Pang <xlpang@linux.alibaba.com>
To: Vlastimil Babka <vbabka@suse.cz>,
Xunlei Pang <xlpang@linux.alibaba.com>,
Christoph Lameter <cl@linux.com>,
Christoph Lameter <cl@gentwo.de>,
Pekka Enberg <penberg@kernel.org>, Roman Gushchin <guro@fb.com>,
Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
David Rientjes <rientjes@google.com>,
Matthew Wilcox <willy@infradead.org>,
Shu Ming <sming56@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Wen Yang <wenyang@linux.alibaba.com>,
James Wang <jnwang@linux.alibaba.com>
Subject: Re: [PATCH v4 1/3] mm/slub: Introduce two counters for partial objects
Date: Thu, 18 Mar 2021 20:56:20 +0800 [thread overview]
Message-ID: <34a07677-3afe-465c-933e-dc9503e9634d@linux.alibaba.com> (raw)
In-Reply-To: <42b5dba7-f89f-ae43-3b93-f6e4868e1573@suse.cz>
On 3/18/21 8:18 PM, Vlastimil Babka wrote:
> On 3/17/21 8:54 AM, Xunlei Pang wrote:
>> The node list_lock in count_partial() spends long time iterating
>> in case of large amount of partial page lists, which can cause
>> thunder herd effect to the list_lock contention.
>>
>> We have HSF RT(High-speed Service Framework Response-Time) monitors,
>> the RT figures fluctuated randomly, then we deployed a tool detecting
>> "irq off" and "preempt off" to dump the culprit's calltrace, capturing
>> the list_lock cost nearly 100ms with irq off issued by "ss", this also
>> caused network timeouts.
>
> I forgot to ask, how does "ss" come into this? It displays network connections
> AFAIK. Does it read any SLUB counters or slabinfo?
>
ss may access /proc/slabinfo to acquire network related slab statistics.
next prev parent reply other threads:[~2021-03-18 12:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-17 7:54 [PATCH v4 0/3] mm/slub: Fix count_partial() problem Xunlei Pang
2021-03-17 7:54 ` [PATCH v4 1/3] mm/slub: Introduce two counters for partial objects Xunlei Pang
2021-03-17 18:45 ` Vlastimil Babka
2021-03-18 4:52 ` Xunlei Pang
2021-03-18 12:18 ` Vlastimil Babka
2021-03-18 12:56 ` Xunlei Pang [this message]
2021-03-22 1:46 ` Shu Ming
2021-03-22 10:22 ` Vlastimil Babka
2021-03-29 1:58 ` Shu Ming
2021-03-17 7:54 ` [PATCH v4 2/3] percpu: Export per_cpu_sum() Xunlei Pang
2021-03-17 7:54 ` [PATCH v4 3/3] mm/slub: Get rid of count_partial() Xunlei Pang
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