[net-next v4 10/11] page_pool: Add a stat tracking waived pages

[Joe Damato <jdamato@fastly.com>]

Track how often pages obtained from the ring cannot be added to the cache
because of a NUMA mismatch.

Signed-off-by: Joe Damato <jdamato@fastly.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 65cd0ca..bb87706 100644
--- a/include/net/page_pool.h
+++ b/include/net/page_pool.h
@@ -150,6 +150,7 @@ struct page_pool_stats {
 			    * slow path allocation
 			    */
 		u64 refill; /* allocations via successful refill */
+		u64 waive;  /* failed refills due to numa zone mismatch */
 	} alloc;
 };
 #endif
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 4fe48ec..0bd084c 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -166,6 +166,7 @@ static struct page *page_pool_refill_alloc_cache(struct page_pool *pool)
 			 * This limit stress on page buddy alloactor.
 			 */
 			page_pool_return_page(pool, page);
+			this_cpu_inc_alloc_stat(pool, waive);
 			page = NULL;
 			break;
 		}
-- 
2.7.4