From: Eric Dumazet <edumazet@google.com>
Date: Thu, 28 Mar 2024 17:34:48 +0000 (+0000)
Subject: net: do not consume a cacheline for system_page_pool
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=5086f0fe46dcf8687c8c2e41e1f07826affebbba;p=linux.git

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@google.com>
Cc: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: Toke Høiland-Jørgensen <toke@redhat.com>
Acked-by: Jesper Dangaard Brouer <hawk@kernel.org>
Link: https://lore.kernel.org/r/20240328173448.2262593-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---

diff --git a/net/core/dev.c b/net/core/dev.c
index 9a67003e49db8..984ff8b9d0e1a 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
 /*