linux-kernel - Re: [PATCH v14 081/138] mm: Add folio

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Message-ID: <1814102.1628631690@warthog.procyon.org.uk>
Date:   Tue, 10 Aug 2021 22:41:30 +0100
From:   David Howells <dhowells@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     dhowells@...hat.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v14 081/138] mm: Add folio_evictable()

Matthew Wilcox (Oracle) <willy@...radead.org> wrote:

> This is the folio equivalent of page_evictable().  Unfortunately, it's
> different from !folio_test_unevictable(), but I think it's used in places
> where you have to be a VM expert and can reasonably be expected to know
> the difference.

It would be useful to say how it is different.  I'm guessing it's because a
page is always entirely mlocked or not, but a folio might be partially
mlocked?

David