netdev - [net-next v4 05/11] page_pool: Add fast path stat

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Message-Id: <1643933373-6590-6-git-send-email-jdamato@fastly.com>
Date:   Thu,  3 Feb 2022 16:09:27 -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 05/11] page_pool: Add fast path stat

Increment the pool's fast path allocation stat when this event occurs.

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 93e587d..864a480 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -142,6 +142,9 @@ struct page_pool {
 
 #ifdef CONFIG_PAGE_POOL_STATS
 struct page_pool_stats {
+	struct {
+		u64 fast; /* fast path allocations */
+	} alloc;
 };
 #endif
 
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 180e48b..b5bf41f 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -185,6 +185,7 @@ 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];
+		this_cpu_inc_alloc_stat(pool, fast);
 	} else {
 		page = page_pool_refill_alloc_cache(pool);
 	}
-- 
2.7.4