From: "Michal Koutný" <mkoutny@suse.com>
To: Lu Jialin <lujialin4@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Michal Hocko <mhocko@kernel.org>,
Roman Gushchin <roman.gushchin@linux.dev>,
Shakeel Butt <shakeelb@google.com>,
Muchun Song <songmuchun@bytedance.com>,
cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [PATCH] mm/memcontrol.c: drains percpu charge caches in memory.reclaim
Date: Thu, 10 Nov 2022 15:42:43 +0100 [thread overview]
Message-ID: <20221110144243.GA10562@blackbody.suse.cz> (raw)
In-Reply-To: <20221110065316.67204-1-lujialin4@huawei.com>
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Hello Jialin.
On Thu, Nov 10, 2022 at 02:53:16PM +0800, Lu Jialin <lujialin4@huawei.com> wrote:
> When user use memory.reclaim to reclaim memory, after drain percpu lru
> caches, drain percpu charge caches for given memcg stock in the hope
> of introducing more evictable pages.
Do you have any data on materialization of this hope?
IIUC, the stock is useful for batched accounting to page_counter but it
doesn't represent real pages. I.e. your change may reduce the
page_counter value but it would not release any pages. Or have I missed
a way how it helps with the reclaim?
Thanks,
Michal
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next prev parent reply other threads:[~2022-11-10 14:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-10 6:53 Lu Jialin
2022-11-10 14:42 ` Michal Koutný [this message]
2022-11-10 19:35 ` Yosry Ahmed
2022-11-10 19:45 ` Yosry Ahmed
2022-11-11 10:08 ` Michal Koutný
2022-11-11 18:24 ` Yosry Ahmed
2022-11-11 20:31 ` Johannes Weiner
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