Re: [PATCH v6 2/6] memcontrol: allows mem_cgroup_iter() to check for onlineness

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To: Nhat Pham <nphamcs@xxxxxxxxx>
Subject: Re: [PATCH v6 2/6] memcontrol: allows mem_cgroup_iter() to check for onlineness
From: Michal Hocko <mhocko@xxxxxxxx>
Date: Tue, 28 Nov 2023 10:38:40 +0100
Cc: akpm@xxxxxxxxxxxxxxxxxxxx, hannes@xxxxxxxxxxx, cerasuolodomenico@xxxxxxxxx, yosryahmed@xxxxxxxxxx, sjenning@xxxxxxxxxx, ddstreet@xxxxxxxx, vitaly.wool@xxxxxxxxxxxx, roman.gushchin@xxxxxxxxx, shakeelb@xxxxxxxxxx, muchun.song@xxxxxxxxx, chrisl@xxxxxxxxxx, linux-mm@xxxxxxxxx, kernel-team@xxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, cgroups@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kselftest@xxxxxxxxxxxxxxx, shuah@xxxxxxxxxx
In-reply-to: <20231127193703.1980089-3-nphamcs@gmail.com>
References: <20231127193703.1980089-1-nphamcs@gmail.com> <20231127193703.1980089-3-nphamcs@gmail.com>

On Mon 27-11-23 11:36:59, Nhat Pham wrote:
> The new zswap writeback scheme requires an online-only memcg hierarchy
> traversal. Add a new parameter to mem_cgroup_iter() to check for
> onlineness before returning.

Why is this needed?
-- 
Michal Hocko
SUSE Labs

Follow-Ups:
- Re: [PATCH v6 2/6] memcontrol: allows mem_cgroup_iter() to check for onlineness
  - From: Nhat Pham

References:
- [PATCH v6 0/6] workload-specific and memory pressure-driven zswap writeback
  - From: Nhat Pham
- [PATCH v6 2/6] memcontrol: allows mem_cgroup_iter() to check for onlineness
  - From: Nhat Pham

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