From: Alex Shi <alex.shi@linux.alibaba.com>
To: Shakeel Butt <shakeelb@google.com>
Cc: Cgroups <cgroups@vger.kernel.org>,
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Subject: Re: [PATCH v3 3/7] mm/lru: replace pgdat lru_lock with lruvec lock
Date: Mon, 18 Nov 2019 20:23:12 +0800 [thread overview]
Message-ID: <3f179d84-85e2-bace-2dbc-e77f73883c71@linux.alibaba.com> (raw)
In-Reply-To: <CALvZod7oUmUCk96ATrRwYvrROFNqL1gPGt7fy949M8TMwCQrWA@mail.gmail.com>
在 2019/11/16 下午3:03, Shakeel Butt 写道:
>> +reget_lruvec:
>> + lruvec = mem_cgroup_page_lruvec(page, pgdat);
>> +
>> /* If we already hold the lock, we can skip some rechecking */
>> - if (!locked) {
>> - locked = compact_lock_irqsave(&pgdat->lru_lock,
>> - &flags, cc);
>> + if (lruvec != locked_lruvec) {
>> + if (locked_lruvec) {
>> + spin_unlock_irqrestore(&locked_lruvec->lru_lock,
>> + locked_lruvec->irqflags);
>> + locked_lruvec = NULL;
>> + }
> What guarantees the lifetime of lruvec? You should read the comment on
> mem_cgroup_page_lruvec(). Have you seen the patches Hugh had shared?
> Please look at the trylock_page_lruvec().
>
Thanks for comments, Shakeel.
lruvec lifetime is same as memcg, which allocted in mem_cgroup_alloc()->alloc_mem_cgroup_per_node_info()
I have read Hugh's patchset, even not every lines. But what's point of you here?
> BTW have you tested Hugh's patches?
>
yes, I have tried the case-lru-file-readtwice on my machine w/o containers, it show a bit more regression.
Thanks
Alex
next prev parent reply other threads:[~2019-11-18 12:23 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-16 3:14 [PATCH v3 0/8] per lruvec lru_lock for memcg Alex Shi
2019-11-16 3:15 ` [PATCH v3 1/7] mm/lru: add per lruvec lock " Alex Shi
2019-11-16 6:28 ` Shakeel Butt
2019-11-18 2:44 ` Alex Shi
2019-11-18 12:08 ` Matthew Wilcox
2019-11-18 12:37 ` Alex Shi
2019-11-19 10:05 ` Alex Shi
2019-11-16 3:15 ` [PATCH v3 2/7] mm/lruvec: add irqsave flags into lruvec struct Alex Shi
2019-11-16 6:31 ` Shakeel Butt
2019-11-18 2:52 ` Alex Shi
2019-11-22 6:46 ` Christoph Hellwig
2019-11-16 3:15 ` [PATCH v3 3/7] mm/lru: replace pgdat lru_lock with lruvec lock Alex Shi
2019-11-16 4:38 ` Matthew Wilcox
2019-11-18 11:55 ` Alex Shi
2019-11-18 12:14 ` Matthew Wilcox
2019-11-18 12:31 ` Alex Shi
2019-11-18 12:34 ` Matthew Wilcox
2019-11-19 10:14 ` Alex Shi
2019-11-16 7:03 ` Shakeel Butt
2019-11-18 12:23 ` Alex Shi [this message]
2019-11-18 12:31 ` Matthew Wilcox
2019-11-19 10:08 ` Alex Shi
2019-11-18 16:11 ` Johannes Weiner
2019-11-19 10:04 ` Alex Shi
2019-11-19 2:10 ` Daniel Jordan
2019-11-19 10:10 ` Alex Shi
2019-11-16 3:15 ` [PATCH v3 4/7] mm/lru: only change the lru_lock iff page's lruvec is different Alex Shi
2019-11-16 3:15 ` [PATCH v3 5/7] mm/pgdat: remove pgdat lru_lock Alex Shi
2019-11-16 3:15 ` [PATCH v3 6/7] mm/lru: likely enhancement Alex Shi
2019-11-16 3:15 ` [PATCH v3 7/7] mm/lru: revise the comments of lru_lock Alex Shi
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