From: Alex Shi <alex.shi@linux.alibaba.com>
To: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, akpm@linux-foundation.org,
mgorman@techsingularity.net, tj@kernel.org, hughd@google.com,
khlebnikov@yandex-team.ru, yang.shi@linux.alibaba.com,
willy@infradead.org, "Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Hocko" <mhocko@kernel.org>,
"Vladimir Davydov" <vdavydov.dev@gmail.com>,
"Roman Gushchin" <guro@fb.com>,
"Shakeel Butt" <shakeelb@google.com>,
"Chris Down" <chris@chrisdown.name>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Vlastimil Babka" <vbabka@suse.cz>, "Qian Cai" <cai@lca.pw>,
"Andrey Ryabinin" <aryabinin@virtuozzo.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
"Jérôme Glisse" <jglisse@redhat.com>,
"Andrea Arcangeli" <aarcange@redhat.com>,
"David Rientjes" <rientjes@google.com>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
swkhack <swkhack@gmail.com>,
"Potyra, Stefan" <Stefan.Potyra@elektrobit.com>,
"Mike Rapoport" <rppt@linux.vnet.ibm.com>,
"Stephen Rothwell" <sfr@canb.auug.org.au>,
"Colin Ian King" <colin.king@canonical.com>,
"Jason Gunthorpe" <jgg@ziepe.ca>,
"Mauro Carvalho Chehab" <mchehab+samsung@kernel.org>,
"Peng Fan" <peng.fan@nxp.com>,
"Nikolay Borisov" <nborisov@suse.com>,
"Ira Weiny" <ira.weiny@intel.com>,
"Kirill Tkhai" <ktkhai@virtuozzo.com>,
"Yafang Shao" <laoar.shao@gmail.com>
Subject: Re: [PATCH v3 3/7] mm/lru: replace pgdat lru_lock with lruvec lock
Date: Tue, 19 Nov 2019 18:10:09 +0800 [thread overview]
Message-ID: <1199177d-6f34-3aae-3eb6-8fac42f070a1@linux.alibaba.com> (raw)
In-Reply-To: <20191119021058.auxc6g7vmgf7d5gg@ca-dmjordan1.us.oracle.com>
在 2019/11/19 上午10:10, Daniel Jordan 写道:
>> - if (pgdat)
>> - spin_unlock_irqrestore(&pgdat->lru_lock, flags);
>> +
>> release_pages(pvec->pages, pvec->nr);
>> pagevec_reinit(pvec);
>> }
> Why can't you keep the locking pattern where we only drop and reacquire if the
> lruvec changes? It'd save a lot of locks and unlocks if most pages were from
> the same memcg and node, or the memory controller were unused.
>
Good catching! This issue will be fixed in the next patch which introduce relock_ function.
Thanks!
next prev parent reply other threads:[~2019-11-19 10:10 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
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 [this message]
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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