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From: Yunsheng Lin <linyunsheng@huawei.com>
To: <davem@davemloft.net>, <kuba@kernel.org>
Cc: <hawk@kernel.org>, <ilias.apalodimas@linaro.org>,
	<netdev@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<hkallweit1@gmail.com>
Subject: [PATCH net-next v2 1/2] page_pool: use relaxed atomic for release side accounting
Date: Fri, 20 Aug 2021 14:56:50 +0800	[thread overview]
Message-ID: <1629442611-61547-2-git-send-email-linyunsheng@huawei.com> (raw)
In-Reply-To: <1629442611-61547-1-git-send-email-linyunsheng@huawei.com>

There is no need to synchronize the account updating, so
use the relaxed atomic to avoid some memory barrier in the
data path.

Signed-off-by: Yunsheng Lin <linyunsheng@huawei.com>
---
 net/core/page_pool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index e140905..1a69784 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -370,7 +370,7 @@ void page_pool_release_page(struct page_pool *pool, struct page *page)
 	/* This may be the last page returned, releasing the pool, so
 	 * it is not safe to reference pool afterwards.
 	 */
-	count = atomic_inc_return(&pool->pages_state_release_cnt);
+	count = atomic_inc_return_relaxed(&pool->pages_state_release_cnt);
 	trace_page_pool_state_release(pool, page, count);
 }
 EXPORT_SYMBOL(page_pool_release_page);
-- 
2.7.4


  reply	other threads:[~2021-08-20  6:58 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20  6:56 [PATCH net-next v2 0/2] Some minor optimization for page pool Yunsheng Lin
2021-08-20  6:56 ` Yunsheng Lin [this message]
2021-08-20  7:12   ` [PATCH net-next v2 1/2] page_pool: use relaxed atomic for release side accounting Jesper Dangaard Brouer
2021-08-20  6:56 ` [PATCH net-next v2 2/2] page_pool: optimize the cpu sync operation when DMA mapping Yunsheng Lin
2021-08-20  9:39   ` Ilias Apalodimas
2021-08-23  3:56     ` Yunsheng Lin
2021-08-23 12:42       ` Ilias Apalodimas
2021-08-24  7:00         ` Yunsheng Lin
2021-08-24  9:04           ` Ilias Apalodimas

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