netdev - [net-next v4 09/11] page_pool: Add stat tracking cache refill

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Message-Id: <1643933373-6590-10-git-send-email-jdamato@fastly.com>
Date:   Thu,  3 Feb 2022 16:09:31 -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,
        saeed@...nel.org, ttoukan.linux@...il.com, brouer@...hat.com
Cc:     Joe Damato <jdamato@...tly.com>
Subject: [net-next v4 09/11] page_pool: Add stat tracking cache refill

Add a stat tracking succesfull allocations which triggered a refill.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 include/net/page_pool.h | 1 +
 net/core/page_pool.c    | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index b243480..65cd0ca 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -149,6 +149,7 @@ struct page_pool_stats {
 		u64 empty; /* failed refills due to empty ptr ring, forcing
 			    * slow path allocation
 			    */
+		u64 refill; /* allocations via successful refill */
 	} alloc;
 };
 #endif
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index b25ded1..4fe48ec 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -172,8 +172,10 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
 	} while (pool->alloc.count < PP_ALLOC_CACHE_REFILL);
 
 	/* Return last page */
-	if (likely(pool->alloc.count > 0))
+	if (likely(pool->alloc.count > 0)) {
 		page = pool->alloc.cache[--pool->alloc.count];
+		this_cpu_inc_alloc_stat(pool, refill);
+	}
 
 	return page;
 }
-- 
2.7.4