netdev - Re: [PATCH v2 06/24] page_pool: Convert page_pool_return_page() to page_pool_return

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Message-ID: <Y70yaoj4Uz+XQYXb@hera>
Date:   Tue, 10 Jan 2023 11:39:54 +0200
From:   Ilias Apalodimas <ilias.apalodimas@...aro.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     Jesper Dangaard Brouer <hawk@...nel.org>, netdev@...r.kernel.org,
        linux-mm@...ck.org, Shakeel Butt <shakeelb@...gle.com>
Subject: Re: [PATCH v2 06/24] page_pool: Convert page_pool_return_page() to
 page_pool_return_netmem()

On Thu, Jan 05, 2023 at 09:46:13PM +0000, Matthew Wilcox (Oracle) wrote:
> Removes a call to compound_head(), saving 464 bytes of kernel text
> as page_pool_return_page() is inlined seven times.
>
> Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
> ---
>  net/core/page_pool.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index 4e985502c569..b606952773a6 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -220,7 +220,13 @@ struct page_pool *page_pool_create(const struct page_pool_params *params)
>  }
>  EXPORT_SYMBOL(page_pool_create);
>
> -static void page_pool_return_page(struct page_pool *pool, struct page *page);
> +static void page_pool_return_netmem(struct page_pool *pool, struct netmem *nm);
> +
> +static inline
> +void page_pool_return_page(struct page_pool *pool, struct page *page)
> +{
> +	page_pool_return_netmem(pool, page_netmem(page));
> +}
>
>  noinline
>  static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
> @@ -499,11 +505,11 @@ void page_pool_release_netmem(struct page_pool *pool, struct netmem *nmem)
>  EXPORT_SYMBOL(page_pool_release_netmem);
>
>  /* Return a page to the page allocator, cleaning up our state */
> -static void page_pool_return_page(struct page_pool *pool, struct page *page)
> +static void page_pool_return_netmem(struct page_pool *pool, struct netmem *nmem)
>  {
> -	page_pool_release_page(pool, page);
> +	page_pool_release_netmem(pool, nmem);
>
> -	put_page(page);
> +	netmem_put(nmem);
>  	/* An optimization would be to call __free_pages(page, pool->p.order)
>  	 * knowing page is not part of page-cache (thus avoiding a
>  	 * __page_cache_release() call).
> --
> 2.35.1
>

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>