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Subject: Re: [PATCH v10 06/33] mm: Add folio_put
To:     "Matthew Wilcox (Oracle)" <willy@infradead.org>,
        akpm@linux-foundation.org
Cc:     linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, Zi Yan <ziy@nvidia.com>,
        Christoph Hellwig <hch@lst.de>,
        Jeff Layton <jlayton@kernel.org>
References: <20210511214735.1836149-1-willy@infradead.org>
 <20210511214735.1836149-7-willy@infradead.org>
From:   Vlastimil Babka <vbabka@suse.cz>
Message-ID: <ed1b4a76-1ed9-5a3d-a22e-69eadda6cf68@suse.cz>
Date:   Fri, 14 May 2021 13:52:11 +0200
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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@infradead.org>
> Reviewed-by: Zi Yan <ziy@nvidia.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Acked-by: Jeff Layton <jlayton@kernel.org>

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