linux-kernel - Re: [PATCH] mm/gup: don't check page lru flag before draining it

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Date: Sat, 8 Jun 2024 16:15:01 +0100
From: Matthew Wilcox <willy@...radead.org>
To: yangge1116 <yangge1116@....com>
Cc: David Hildenbrand <david@...hat.com>,
	Baolin Wang <baolin.wang@...ux.alibaba.com>,
	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, liuzixing@...on.cn
Subject: Re: [PATCH] mm/gup: don't check page lru flag before draining it

On Sat, Jun 08, 2024 at 12:38:49PM +0800, yangge1116 wrote:
> Can we add a PG_lru_batch flag to determine whether a page is in lru batch?
> If we can, seems this problem will be easier.

Page flags are in short supply.  You'd need a really good justification.