netdev - [net-next v2 09/10] page_pool: Add a stat tracking waived pages

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Message-Id: <1643499540-8351-10-git-send-email-jdamato@fastly.com>
Date:   Sat, 29 Jan 2022 15:38:59 -0800
From:   Joe Damato <jdamato@...tly.com>
To:     netdev@...r.kernel.org, kuba@...nel.org,
        ilias.apalodimas@...aro.org, davem@...emloft.net, hawk@...nel.org
Cc:     Joe Damato <jdamato@...tly.com>
Subject: [net-next v2 09/10] page_pool: Add a stat tracking waived pages

Track how often pages obtained from the ring cannot be added to the cache
because of a NUMA mismatch.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 include/net/page_pool.h | 1 +
 net/core/page_pool.c    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index 4991109..e411ef6 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -150,6 +150,7 @@ struct page_pool_stats {
 			    * slow path allocation
 			    */
 		u64 refill; /* allocations via successful refill */
+		u64 waive;  /* failed refills due to numa zone mismatch */
 	} alloc;
 };
 
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index ffb68b8..c6f31c5 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -161,6 +161,7 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
 			 * This limit stress on page buddy alloactor.
 			 */
 			page_pool_return_page(pool, page);
+			page_pool_stat_alloc_inc(waive);
 			page = NULL;
 			break;
 		}
-- 
2.7.4