From: "Michal Koutný" <mkoutny@suse.com>
To: "T.J. Mercier" <tjmercier@google.com>
Cc: Efly Young <yangyifei03@kuaishou.com>,
hannes@cmpxchg.org, akpm@linux-foundation.org,
android-mm@google.com, cgroups@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
mhocko@kernel.org, muchun.song@linux.dev,
roman.gushchin@linux.dev, shakeelb@google.com,
yuzhao@google.com
Subject: Re: Re: Re: [PATCH] mm: memcg: Use larger chunks for proactive reclaim
Date: Fri, 2 Feb 2024 20:46:56 +0100 [thread overview]
Message-ID: <bycpbzvo2fpd2qrrl7ipnzrsyun7hg5tjlqouafuosxxlxfml5@vpbl6kl74hx5> (raw)
In-Reply-To: <CABdmKX2KsxVExVWzysc_fQagGkYWhqRF00KxNxjpVWovHHip+Q@mail.gmail.com>
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On Fri, Feb 02, 2024 at 10:22:34AM -0800, "T.J. Mercier" <tjmercier@google.com> wrote:
> So all of these should be more or less equivalent:
> delta <= SWAP_CLUSTER_MAX ? delta : (delta + 3*SWAP_CLUSTER_MAX) / 4
> max((nr_to_reclaim - nr_reclaimed) / 4, (nr_to_reclaim - nr_reclaimed) % 4)
> (nr_to_reclaim - nr_reclaimed) / 4 + 4
> (nr_to_reclaim - nr_reclaimed) / 4
>
> I was just trying to avoid putting in a 0 for the request size with the mod.
The third variant would be simpler then. Modulo looks weird.
Oh, and I just realized that try_to_free_mem_cgroup_pages() does
max(nr_pages, SWAP_CLUSTER_MAX). Then I'd vote for the fourth variant +
possible comment about harmless 0.
(I'm sorry if this was discussed before.)
Michal
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next prev parent reply other threads:[~2024-02-02 19:47 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-31 16:24 T.J. Mercier
2024-01-31 17:50 ` Johannes Weiner
2024-01-31 18:01 ` T.J. Mercier
2024-01-31 20:12 ` Johannes Weiner
2024-02-01 13:57 ` Michal Koutný
2024-02-01 15:34 ` Johannes Weiner
2024-02-01 18:10 ` T.J. Mercier
2024-02-02 5:02 ` Efly Young
2024-02-02 10:15 ` Michal Koutný
2024-02-02 18:22 ` T.J. Mercier
2024-02-02 19:46 ` Michal Koutný [this message]
2024-02-02 21:42 ` T.J. Mercier
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