linux-kernel - Re: [PATCH] mm/lru: simplify is_file_lru() and is_active

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Message-ID: <20201117174041.GP29991@casper.infradead.org>
Date:   Tue, 17 Nov 2020 17:40:41 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Hui Su <sh_def@....com>
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/lru: simplify is_file_lru() and is_active_lru()

On Wed, Nov 18, 2020 at 12:49:19AM +0800, Hui Su wrote:
> page->lru bit 0 can tell whether the page is
> avtive page or not.
> page->lru bit 1 can tell whether the page is
> file page or not.

This is wrong.  I'll let you figure out why.