linux-kernel - Re: [PATCH] mm: memcg supports freeing the specified zone's memory

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Message-ID: <Z4okBYrYD8G1WdKx@tiehlicka>
Date: Fri, 17 Jan 2025 10:33:57 +0100
From: Michal Hocko <mhocko@...e.com>
To: zhiguojiang <justinjiang@...o.com>
Cc: Johannes Weiner <hannes@...xchg.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Muchun Song <muchun.song@...ux.dev>,
	Andrew Morton <akpm@...ux-foundation.org>, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	opensource.kernel@...o.com
Subject: Re: [PATCH] mm: memcg supports freeing the specified zone's memory

On Fri 17-01-25 12:41:40, zhiguojiang wrote:
[...]
> In response to the above situation, we need reclaim only the normal
> zone's memory occupied by memcg by try_to_free_mem_cgroup_pages(), in
> order to solve the issues of the gfp flags allocations and failure due
> to gfp flags limited only to alloc memory from the normal zone. At this
> point, if the memcg memory reclaimed by try_to_free_mem_cgroup_pages()
> mainly comes from the movable zone, which cannot solve such problems.

Memory cgroup reclaim doesn't allocate the memory directly. This is done
by the page allocator called before the memory is charged. The memcg
charging is then responsible for reclaiming charges and that is not
really zone aware.

Could you describe problem that you are trying to solve?
-- 
Michal Hocko
SUSE Labs