linux-kernel - [PATCH net-next] net: page_pool: add page allocation stats for two fast page allocate path

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Message-ID: <20220512065631.33673-1-huangguangbin2@huawei.com>
Date:   Thu, 12 May 2022 14:56:31 +0800
From:   Guangbin Huang <huangguangbin2@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>, <edumazet@...gle.com>,
        <pabeni@...hat.com>, <bpf@...r.kernel.org>
CC:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lipeng321@...wei.com>, <huangguangbin2@...wei.com>,
        <chenhao288@...ilicon.com>
Subject: [PATCH net-next] net: page_pool: add page allocation stats for two fast page allocate path

From: Jie Wang <wangjie125@...wei.com>

Currently If use page pool allocation stats to analysis a RX performance
degradation problem. These stats only count for pages allocate from
page_pool_alloc_pages. But nic drivers such as hns3 use
page_pool_dev_alloc_frag to allocate pages, so page stats in this API
should also be counted.

Signed-off-by: Jie Wang <wangjie125@...wei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@...wei.com>
---
 net/core/page_pool.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index bdbadfaee867..f18e6e771993 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -704,8 +704,10 @@ struct page *page_pool_alloc_frag(struct page_pool *pool,
 
 	if (page && *offset + size > max_size) {
 		page = page_pool_drain_frag(pool, page);
-		if (page)
+		if (page) {
+			alloc_stat_inc(pool, fast);
 			goto frag_reset;
+		}
 	}
 
 	if (!page) {
@@ -727,6 +729,7 @@ struct page *page_pool_alloc_frag(struct page_pool *pool,
 
 	pool->frag_users++;
 	pool->frag_offset = *offset + size;
+	alloc_stat_inc(pool, fast);
 	return page;
 }
 EXPORT_SYMBOL(page_pool_alloc_frag);
-- 
2.33.0