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From: Vlastimil Babka <vbabka@suse.cz>
To: 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 13:18:14 +0100	[thread overview]
Message-ID: <42b5dba7-f89f-ae43-3b93-f6e4868e1573@suse.cz> (raw)
In-Reply-To: <1615967692-80524-2-git-send-email-xlpang@linux.alibaba.com>

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?


  parent reply	other threads:[~2021-03-18 12:18 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 [this message]
2021-03-18 12:56     ` Xunlei Pang
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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