linux-kernel - Re: [PATCH v11 11/33] mm/lru: Add folio LRU functions

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Message-ID: <813937.1623837648@warthog.procyon.org.uk>
Date:   Wed, 16 Jun 2021 11:00:48 +0100
From:   David Howells <dhowells@...hat.com>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     dhowells@...hat.com, akpm@...ux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Yu Zhao <yuzhao@...gle.com>
Subject: Re: [PATCH v11 11/33] mm/lru: Add folio LRU functions

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

> Handle arbitrary-order folios being added to the LRU.  By definition,
> all pages being added to the LRU were already head or base pages,
> so define page wrappers around folio functions where the original
> page functions involved calling compound_head() to manipulate flags,
> but define folio wrappers around page functions where there's no need to
> call compound_head().  The one thing that does change for those functions
> is calling compound_nr() instead of thp_nr_pages(), in order to handle
> arbitrary-sized folios.
> 
> Saves 783 bytes of kernel text; no functions grow.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Yu Zhao <yuzhao@...gle.com>

Reviewed-by: David Howells <dhowells@...hat.com>