netdev - [PATCH v2 net-next 1/3] net: Add cache alignment in sock

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1432658049-3400132-2-git-send-email-tom@herbertland.com>
Date:	Tue, 26 May 2015 09:34:07 -0700
From:	Tom Herbert <tom@...bertland.com>
To:	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: [PATCH v2 net-next 1/3] net: Add cache alignment in sock_common for socket lookup fields

Use ____cacheline_aligned_in_smp to keep the fields used on socket
lookup in their own cachelines. These are read only fields and will
be often accessed on accross CPUs (would be very common with
SO_REUSEPORT for instance).

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 include/net/sock.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index 26c1c31..bcf6114 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -211,7 +211,13 @@ struct sock_common {
 		struct hlist_node	skc_node;
 		struct hlist_nulls_node skc_nulls_node;
 	};
-	int			skc_tx_queue_mapping;
+
+	/* Cachelines above this point are read mostly and are used in socket
+	 * lookup.
+	 */
+	int			skc_tx_queue_mapping
+				____cacheline_aligned_in_smp;
+
 	atomic_t		skc_refcnt;
 	/* private: */
 	int                     skc_dontcopy_end[0];
-- 
1.8.1

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html