linux-kernel - Re: [PATCH v10 06/33] mm: Add folio

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Message-ID: <ed1b4a76-1ed9-5a3d-a22e-69eadda6cf68@suse.cz>
Date:   Fri, 14 May 2021 13:52:11 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        akpm@...ux-foundation.org
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Zi Yan <ziy@...dia.com>,
        Christoph Hellwig <hch@....de>,
        Jeff Layton <jlayton@...nel.org>
Subject: Re: [PATCH v10 06/33] mm: Add folio_put

On 5/11/21 11:47 PM, Matthew Wilcox (Oracle) wrote:
> If we know we have a folio, we can call folio_put() instead of put_page()
> and save the overhead of calling compound_head().  Also skips the
> devmap checks.
> 
> This commit looks like it should be a no-op, but actually saves 1312 bytes
> of text with the distro-derived config that I'm testing.  Some functions
> grow a little while others shrink.  I presume the compiler is making
> different inlining decisions.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> Reviewed-by: Zi Yan <ziy@...dia.com>
> Reviewed-by: Christoph Hellwig <hch@....de>
> Acked-by: Jeff Layton <jlayton@...nel.org>

Acked-by: Vlastimil Babka <vbabka@...e.cz>