[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <20231130133340.36140526608289898acb3ac5@linux-foundation.org>
Date: Thu, 30 Nov 2023 13:33:40 -0800
From: Andrew Morton <akpm@...ux-foundation.org>
To: Dan Schatzberg <schatzberg.dan@...il.com>
Cc: Johannes Weiner <hannes@...xchg.org>,
Roman Gushchin <roman.gushchin@...ux.dev>,
Yosry Ahmed <yosryahmed@...gle.com>, Huan Yang <link@...o.com>,
linux-kernel@...r.kernel.org, cgroups@...r.kernel.org,
linux-mm@...ck.org, Michal Hocko <mhocko@...nel.org>,
Shakeel Butt <shakeelb@...gle.com>,
Muchun Song <muchun.song@...ux.dev>,
David Hildenbrand <david@...hat.com>,
Matthew Wilcox <willy@...radead.org>,
Huang Ying <ying.huang@...el.com>,
Kefeng Wang <wangkefeng.wang@...wei.com>,
Peter Xu <peterx@...hat.com>,
"Vishal Moola (Oracle)" <vishal.moola@...il.com>,
Yue Zhao <findns94@...il.com>, Hugh Dickins <hughd@...gle.com>
Subject: Re: [PATCH 1/1] mm: add swapiness= arg to memory.reclaim
On Thu, 30 Nov 2023 07:36:54 -0800 Dan Schatzberg <schatzberg.dan@...il.com> wrote:
> Allow proactive reclaimers to submit an additional swappiness=<val>
> argument to memory.reclaim. This overrides the global or per-memcg
> swappiness setting for that reclaim attempt.
>
> For example:
>
> echo "2M swappiness=0" > /sys/fs/cgroup/memory.reclaim
>
> will perform reclaim on the rootcg with a swappiness setting of 0 (no
> swap) regardless of the vm.swappiness sysctl setting.
>
> Signed-off-by: Dan Schatzberg <schatzberg.dan@...il.com>
> ---
> include/linux/swap.h | 3 ++-
> mm/memcontrol.c | 55 +++++++++++++++++++++++++++++++++++---------
> mm/vmscan.c | 13 +++++++++--
Documentation/admin-guide/cgroup-v2.rst is feeling unloved!
Please check whether this interface change can lead to
non-backward-compatible userspace. If someone's script does the above
echo command, will it break on older kernels? If so, does it matter?
Powered by blists - more mailing lists