linux-kernel - Re: [PATCH v1 2/2] mm:vmscan: fix shrink sc parameters issue

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Date: Thu, 11 Jan 2024 08:43:38 -0500
From: Johannes Weiner <hannes@...xchg.org>
To: Zhiguo Jiang <justinjiang@...o.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Matthew Wilcox <willy@...radead.org>, Chris Li <chrisl@...nel.org>,
	Michal Hocko <mhocko@...e.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Dan Schatzberg <schatzberg.dan@...il.com>,
	Yosry Ahmed <yosryahmed@...gle.com>, Yue Zhao <findns94@...il.com>,
	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, opensource.kernel@...o.com
Subject: Re: [PATCH v1 2/2] mm:vmscan: fix shrink sc parameters issue

On Thu, Jan 11, 2024 at 08:24:51PM +0800, Zhiguo Jiang wrote:
> The values of struct scan_control's members obtained by
> prepare_scan_control() are always from root_mem_cgroup, rather than
> the memcg where the shrinked folio is actually located, such as
> sc->anon_cost, sc->file_cost, sc->may_deactivate and so on. This is
> an inaccurate sc values for the actual situation of the current
> shrinking memcg. so we need fix the values of struct scan_control's
> members are corresponding to the current shrinking memcg.

You don't seem to understand how cgroup reclaim works.

Nacked-by: Johannes Weiner <hannes@...xchg.org>