linux-kernel - Re: [PATCH v11 19/33] mm/filemap: Add folio

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Date:   Wed, 16 Jun 2021 11:17:35 +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, Christoph Hellwig <hch@....de>,
        Jeff Layton <jlayton@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        William Kucharski <william.kucharski@...cle.com>
Subject: Re: [PATCH v11 19/33] mm/filemap: Add folio_lock()

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

> This is like lock_page() but for use by callers who know they have a folio.
> Convert __lock_page() to be __folio_lock().  This saves one call to
> compound_head() per contended call to lock_page().
> 
> Saves 455 bytes of text; mostly from improved register allocation and
> inlining decisions.  __folio_lock is 59 bytes while __lock_page was 79.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Acked-by: Jeff Layton <jlayton@...nel.org>
> Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Reviewed-by: William Kucharski <william.kucharski@...cle.com>

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