[NET]: use __read_mostly on kmem_cache_t , DEFINE_SNMP_STAT pointers
This patch puts mostly read only data in the right section
(read_mostly), to help sharing of these data between CPUS without
memory ping pongs.
On one of my production machine, tcp_statistics was sitting in a
heavily modified cache line, so *every* SNMP update had to force a
reload.
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 554f224..fe1a73c 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -28,13 +28,13 @@
#include <linux/workqueue.h>
#include <linux/sunrpc/rpc_pipe_fs.h>
-static struct vfsmount *rpc_mount;
+static struct vfsmount *rpc_mount __read_mostly;
static int rpc_mount_count;
static struct file_system_type rpc_pipe_fs_type;
-static kmem_cache_t *rpc_inode_cachep;
+static kmem_cache_t *rpc_inode_cachep __read_mostly;
#define RPC_UPCALL_TIMEOUT (30*HZ)
diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
index 2d9eb7f..f310403 100644
--- a/net/sunrpc/sched.c
+++ b/net/sunrpc/sched.c
@@ -34,10 +34,10 @@
#define RPC_BUFFER_MAXSIZE (2048)
#define RPC_BUFFER_POOLSIZE (8)
#define RPC_TASK_POOLSIZE (8)
-static kmem_cache_t *rpc_task_slabp;
-static kmem_cache_t *rpc_buffer_slabp;
-static mempool_t *rpc_task_mempool;
-static mempool_t *rpc_buffer_mempool;
+static kmem_cache_t *rpc_task_slabp __read_mostly;
+static kmem_cache_t *rpc_buffer_slabp __read_mostly;
+static mempool_t *rpc_task_mempool __read_mostly;
+static mempool_t *rpc_buffer_mempool __read_mostly;
static void __rpc_default_timer(struct rpc_task *task);
static void rpciod_killall(void);
