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Message-ID: <YA/4LNJPEQJv++mo@apalos.home>
Date: Tue, 26 Jan 2021 13:08:28 +0200
From: Ilias Apalodimas <ilias.apalodimas@...aro.org>
To: Alexander Lobakin <alobakin@...me>
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Yisen Zhuang <yisen.zhuang@...wei.com>,
Salil Mehta <salil.mehta@...wei.com>,
Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
Saeed Mahameed <saeedm@...dia.com>,
Leon Romanovsky <leon@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Jesper Dangaard Brouer <hawk@...nel.org>,
Jonathan Lemon <jonathan.lemon@...il.com>,
Willem de Bruijn <willemb@...gle.com>,
Randy Dunlap <rdunlap@...radead.org>,
Aleksandr Nogikh <nogikh@...gle.com>,
Pablo Neira Ayuso <pablo@...filter.org>,
Dexuan Cui <decui@...rosoft.com>,
Jakub Sitnicki <jakub@...udflare.com>,
Marco Elver <elver@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
linux-rdma@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH net-next 3/3] net: page_pool: simplify page recycling
condition tests
On Mon, Jan 25, 2021 at 04:47:20PM +0000, Alexander Lobakin wrote:
> pool_page_reusable() is a leftover from pre-NUMA-aware times. For now,
> this function is just a redundant wrapper over page_is_pfmemalloc(),
> so Inline it into its sole call site.
>
> Signed-off-by: Alexander Lobakin <alobakin@...me>
> ---
> net/core/page_pool.c | 14 ++++----------
> 1 file changed, 4 insertions(+), 10 deletions(-)
>
> diff --git a/net/core/page_pool.c b/net/core/page_pool.c
> index f3c690b8c8e3..ad8b0707af04 100644
> --- a/net/core/page_pool.c
> +++ b/net/core/page_pool.c
> @@ -350,14 +350,6 @@ static bool page_pool_recycle_in_cache(struct page *page,
> return true;
> }
>
> -/* page is NOT reusable when:
> - * 1) allocated when system is under some pressure. (page_is_pfmemalloc)
> - */
> -static bool pool_page_reusable(struct page_pool *pool, struct page *page)
> -{
> - return !page_is_pfmemalloc(page);
> -}
> -
> /* If the page refcnt == 1, this will try to recycle the page.
> * if PP_FLAG_DMA_SYNC_DEV is set, we'll try to sync the DMA area for
> * the configured size min(dma_sync_size, pool->max_len).
> @@ -373,9 +365,11 @@ __page_pool_put_page(struct page_pool *pool, struct page *page,
> * regular page allocator APIs.
> *
> * refcnt == 1 means page_pool owns page, and can recycle it.
> + *
> + * page is NOT reusable when allocated when system is under
> + * some pressure. (page_is_pfmemalloc)
> */
> - if (likely(page_ref_count(page) == 1 &&
> - pool_page_reusable(pool, page))) {
> + if (likely(page_ref_count(page) == 1 && !page_is_pfmemalloc(page))) {
> /* Read barrier done in page_ref_count / READ_ONCE */
>
> if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
> --
> 2.30.0
>
>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@...aro.org>
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