From: Michal Hocko <mhocko@kernel.org>
To: Yang Shi <shy828301@gmail.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>,
Linux MM <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
cgroups@vger.kernel.org,
Vladimir Davydov <vdavydov.dev@gmail.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH RFC] mm/memcontrol: reclaim severe usage over high limit in get_user_pages loop
Date: Mon, 29 Jul 2019 20:48:50 +0200 [thread overview]
Message-ID: <20190729184850.GH9330@dhcp22.suse.cz> (raw)
In-Reply-To: <CAHbLzkrdj-O2uXwM8ujm90OcgjyR4nAiEbFtRGe7SOoY_fs=BA@mail.gmail.com>
On Mon 29-07-19 10:28:43, Yang Shi wrote:
[...]
> I don't worry too much about scale since the scale issue is not unique
> to background reclaim, direct reclaim may run into the same problem.
Just to clarify. By scaling problem I mean 1:1 kswapd thread to memcg.
You can have thousands of memcgs and I do not think we really do want
to create one kswapd for each. Once we have a kswapd thread pool then we
get into a tricky land where a determinism/fairness would be non trivial
to achieve. Direct reclaim, on the other hand is bound by the workload
itself.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2019-07-29 18:48 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-28 12:29 Konstantin Khlebnikov
2019-07-29 9:17 ` Michal Hocko
2019-07-29 9:40 ` Konstantin Khlebnikov
2019-07-29 10:33 ` Michal Hocko
2019-07-29 11:24 ` Konstantin Khlebnikov
2019-07-29 17:28 ` Yang Shi
2019-07-29 18:48 ` Michal Hocko [this message]
2019-08-01 21:00 ` Yang Shi
2019-08-02 9:35 ` Michal Hocko
2019-08-02 18:56 ` Yang Shi
2019-08-05 14:32 ` Michal Hocko
2019-08-05 19:24 ` Shakeel Butt
2019-08-06 3:28 ` Yang Shi
2019-08-06 7:05 ` Michal Hocko
2019-07-29 15:49 ` Johannes Weiner
2019-07-29 18:55 ` Michal Hocko
2019-08-02 9:40 ` Michal Hocko
2019-08-02 10:01 ` Konstantin Khlebnikov
2019-08-02 11:44 ` Michal Hocko
2019-08-06 7:07 ` Michal Hocko
2019-08-06 7:19 ` Konstantin Khlebnikov
2019-08-06 7:36 ` Michal Hocko
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