Messages in this thread | | | Subject | Re: [PATCH v4 1/3] mm/slub: Introduce two counters for partial objects | From | Vlastimil Babka <> | Date | Thu, 18 Mar 2021 13:18:14 +0100 |
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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?
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