netdev - [net-next v4 07/11] page_pool: Add slow path high order alloc stat

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Message-Id: <1643933373-6590-8-git-send-email-jdamato@fastly.com>
Date:   Thu,  3 Feb 2022 16:09:29 -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 07/11] page_pool: Add slow path high order alloc stat

Track high order 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    | 1 +
 2 files changed, 2 insertions(+)

diff --git a/include/net/page_pool.h b/include/net/page_pool.h
index 7d5f202..0c4cb49 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -145,6 +145,7 @@ struct page_pool_stats {
 	struct {
 		u64 fast; /* fast path allocations */
 		u64 slow; /* slow-path order 0 allocations */
+		u64 slow_high_order; /* slow-path high order allocations */
 	} alloc;
 };
 #endif
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 264d8c9..b7d0995 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -259,6 +259,7 @@ static struct page *__page_pool_alloc_page_order(struct page_pool *pool,
 		return NULL;
 	}
 
+	this_cpu_inc_alloc_stat(pool, slow_high_order);
 	page_pool_set_pp_info(pool, page);
 
 	/* Track how many pages are held 'in-flight' */
-- 
2.7.4