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Date:   Sun, 31 Jan 2021 12:12:11 +0000
To:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>
From:   Alexander Lobakin <alobakin@pm.me>
Cc:     John Hubbard <jhubbard@nvidia.com>,
        David Rientjes <rientjes@google.com>,
        Yisen Zhuang <yisen.zhuang@huawei.com>,
        Salil Mehta <salil.mehta@huawei.com>,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Tony Nguyen <anthony.l.nguyen@intel.com>,
        Saeed Mahameed <saeedm@nvidia.com>,
        Leon Romanovsky <leon@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Jesper Dangaard Brouer <brouer@redhat.com>,
        Ilias Apalodimas <ilias.apalodimas@linaro.org>,
        Jonathan Lemon <jonathan.lemon@gmail.com>,
        Willem de Bruijn <willemb@google.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Pablo Neira Ayuso <pablo@netfilter.org>,
        Dexuan Cui <decui@microsoft.com>,
        Jakub Sitnicki <jakub@cloudflare.com>,
        Marco Elver <elver@google.com>,
        Paolo Abeni <pabeni@redhat.com>,
        Alexander Lobakin <alobakin@pm.me>, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, intel-wired-lan@lists.osuosl.org,
        linux-rdma@vger.kernel.org, linux-mm@kvack.org
Reply-To: Alexander Lobakin <alobakin@pm.me>
Subject: [PATCH v3 net-next 5/5] net: page_pool: simplify page recycling condition tests
Message-ID: <20210131120844.7529-6-alobakin@pm.me>
In-Reply-To: <20210131120844.7529-1-alobakin@pm.me>
References: <20210131120844.7529-1-alobakin@pm.me>
MIME-Version: 1.0
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Precedence: bulk

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@pm.me>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Acked-by: David Rientjes <rientjes@google.com>
---
 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 *pa=
ge,
 =09return true;
 }
=20
-/* 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)
-{
-=09return !page_is_pfmemalloc(page);
-}
-
 /* If the page refcnt =3D=3D 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 pa=
ge *page,
 =09 * regular page allocator APIs.
 =09 *
 =09 * refcnt =3D=3D 1 means page_pool owns page, and can recycle it.
+=09 *
+=09 * page is NOT reusable when allocated when system is under
+=09 * some pressure. (page_is_pfmemalloc)
 =09 */
-=09if (likely(page_ref_count(page) =3D=3D 1 &&
-=09=09   pool_page_reusable(pool, page))) {
+=09if (likely(page_ref_count(page) =3D=3D 1 && !page_is_pfmemalloc(page)))=
 {
 =09=09/* Read barrier done in page_ref_count / READ_ONCE */
=20
 =09=09if (pool->p.flags & PP_FLAG_DMA_SYNC_DEV)
--=20
2.30.0