netdev - [net-next v2 04/10] page_pool: Add stat tracking fast path allocations

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Message-Id: <1643499540-8351-5-git-send-email-jdamato@fastly.com>
Date:   Sat, 29 Jan 2022 15:38:54 -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 04/10] page_pool: Add stat tracking fast path allocations

Add a counter to track successful fast-path allocations.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 include/net/page_pool.h | 3 +++
 net/core/page_pool.c    | 1 +
 2 files changed, 4 insertions(+)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index dae65f2..96949ad 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -142,6 +142,9 @@ struct page_pool {
  * stats for tracking page_pool events.
  */
 struct page_pool_stats {
+	struct {
+		u64 fast; /* fast path allocations */
+	} alloc;
 };
 
 DECLARE_PER_CPU_ALIGNED(struct page_pool_stats, page_pool_stats);
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index b1a2599..6f692d9 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -180,6 +180,7 @@ static struct page *__page_pool_get_cached(struct page_pool *pool)
 	if (likely(pool->alloc.count)) {
 		/* Fast-path */
 		page = pool->alloc.cache[--pool->alloc.count];
+		page_pool_stat_alloc_inc(fast);
 	} else {
 		page = page_pool_refill_alloc_cache(pool);
 	}
-- 
2.7.4