netdev - [net-next v3 05/10] page_pool: Add slow path order 0 allocation stat

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Message-Id: <1643764336-63864-6-git-send-email-jdamato@fastly.com>
Date:   Tue,  1 Feb 2022 17:12:11 -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 v3 05/10] page_pool: Add slow path order 0 allocation stat

Track order 0 allocations in the slow path which cause an interaction with
the buddy allocator.

Signed-off-by: Joe Damato <jdamato@...tly.com>
---
 include/net/page_pool.h | 1 +
 net/core/page_pool.c    | 6 ++++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index 96949ad..ab67e86 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -144,6 +144,7 @@ struct page_pool {
 struct page_pool_stats {
 	struct {
 		u64 fast; /* fast path allocations */
+		u64 slow; /* slow-path order-0 allocations */
 	} alloc;
 };
 
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 6f692d9..554a40e 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -308,10 +308,12 @@ static struct page *__page_pool_alloc_pages_slow(struct page_pool *pool,
 	}
 
 	/* Return last page */
-	if (likely(pool->alloc.count > 0))
+	if (likely(pool->alloc.count > 0)) {
 		page = pool->alloc.cache[--pool->alloc.count];
-	else
+		page_pool_stat_alloc_inc(slow);
+	} else {
 		page = NULL;
+	}
 
 	/* When page just alloc'ed is should/must have refcnt 1. */
 	return page;
-- 
2.7.4