netdev - [PATCH net] net: do not consume a cacheline for system_page

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Message-ID: <20240328173448.2262593-1-edumazet@google.com>
Date: Thu, 28 Mar 2024 17:34:48 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, Lorenzo Bianconi <lorenzo@...nel.org>, 
	Jesper Dangaard Brouer <hawk@...nel.org>, 
	"Toke Høiland-Jørgensen" <toke@...hat.com>
Subject: [PATCH net] net: do not consume a cacheline for system_page_pool

There is no reason to consume a full cacheline to store system_page_pool.

We can eventually move it to softnet_data later for full locality control.

Fixes: 2b0cfa6e4956 ("net: add generic percpu page_pool allocator")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Toke Høiland-Jørgensen <toke@...hat.com>
---
 net/core/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index 9a67003e49db87f3f92b6c6296b3e7a5ca9d9171..984ff8b9d0e1aa5646a7237a8cf0b0a21c2aa559 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -429,7 +429,7 @@ EXPORT_PER_CPU_SYMBOL(softnet_data);
  * PP consumers must pay attention to run APIs in the appropriate context
  * (e.g. NAPI context).
  */
-static DEFINE_PER_CPU_ALIGNED(struct page_pool *, system_page_pool);
+static DEFINE_PER_CPU(struct page_pool *, system_page_pool);
 
 #ifdef CONFIG_LOCKDEP
 /*
-- 
2.44.0.478.gd926399ef9-goog