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-rw-r--r--include/net/net_namespace.h25
1 files changed, 17 insertions, 8 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index f8712bbeb2e0..4c2cd9378699 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -52,6 +52,9 @@ struct bpf_prog;
#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
struct net {
+ /* First cache line can be often dirtied.
+ * Do not place here read-mostly fields.
+ */
refcount_t passive; /* To decide when the network
* namespace should be freed.
*/
@@ -60,7 +63,13 @@ struct net {
*/
spinlock_t rules_mod_lock;
- u32 hash_mix;
+ unsigned int dev_unreg_count;
+
+ unsigned int dev_base_seq; /* protected by rtnl_mutex */
+ int ifindex;
+
+ spinlock_t nsid_lock;
+ atomic_t fnhe_genid;
struct list_head list; /* list of network namespaces */
struct list_head exit_list; /* To linked to call pernet exit
@@ -76,11 +85,11 @@ struct net {
#endif
struct user_namespace *user_ns; /* Owning user namespace */
struct ucounts *ucounts;
- spinlock_t nsid_lock;
struct idr netns_ids;
struct ns_common ns;
+ struct list_head dev_base_head;
struct proc_dir_entry *proc_net;
struct proc_dir_entry *proc_net_stat;
@@ -93,17 +102,18 @@ struct net {
struct uevent_sock *uevent_sock; /* uevent socket */
- struct list_head dev_base_head;
struct hlist_head *dev_name_head;
struct hlist_head *dev_index_head;
- unsigned int dev_base_seq; /* protected by rtnl_mutex */
- int ifindex;
- unsigned int dev_unreg_count;
+ /* Note that @hash_mix can be read millions times per second,
+ * it is critical that it is on a read_mostly cache line.
+ */
+ u32 hash_mix;
+
+ struct net_device *loopback_dev; /* The loopback */
/* core fib_rules */
struct list_head rules_ops;
- struct net_device *loopback_dev; /* The loopback */
struct netns_core core;
struct netns_mib mib;
struct netns_packet packet;
@@ -171,7 +181,6 @@ struct net {
struct sock *crypto_nlsk;
#endif
struct sock *diag_nlsk;
- atomic_t fnhe_genid;
} __randomize_layout;
#include <linux/seq_file_net.h>