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Subject[this_cpu_xx V4 04/20] Use this_cpu operations for NFS statistics
Simplify NFS statistics and allow the use of optimized
arch instructions.

Acked-by: Tejun Heo <tj@kernel.org>
CC: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>

---
fs/nfs/iostat.h | 24 +++---------------------
1 file changed, 3 insertions(+), 21 deletions(-)

Index: linux-2.6/fs/nfs/iostat.h
===================================================================
--- linux-2.6.orig/fs/nfs/iostat.h 2009-09-29 11:57:01.000000000 -0500
+++ linux-2.6/fs/nfs/iostat.h 2009-09-29 12:26:42.000000000 -0500
@@ -25,13 +25,7 @@ struct nfs_iostats {
static inline void nfs_inc_server_stats(const struct nfs_server *server,
enum nfs_stat_eventcounters stat)
{
- struct nfs_iostats *iostats;
- int cpu;
-
- cpu = get_cpu();
- iostats = per_cpu_ptr(server->io_stats, cpu);
- iostats->events[stat]++;
- put_cpu();
+ this_cpu_inc(server->io_stats->events[stat]);
}

static inline void nfs_inc_stats(const struct inode *inode,
@@ -44,13 +38,7 @@ static inline void nfs_add_server_stats(
enum nfs_stat_bytecounters stat,
unsigned long addend)
{
- struct nfs_iostats *iostats;
- int cpu;
-
- cpu = get_cpu();
- iostats = per_cpu_ptr(server->io_stats, cpu);
- iostats->bytes[stat] += addend;
- put_cpu();
+ this_cpu_add(server->io_stats->bytes[stat], addend);
}

static inline void nfs_add_stats(const struct inode *inode,
@@ -65,13 +53,7 @@ static inline void nfs_add_fscache_stats
enum nfs_stat_fscachecounters stat,
unsigned long addend)
{
- struct nfs_iostats *iostats;
- int cpu;
-
- cpu = get_cpu();
- iostats = per_cpu_ptr(NFS_SERVER(inode)->io_stats, cpu);
- iostats->fscache[stat] += addend;
- put_cpu();
+ this_cpu_add(NFS_SERVER(inode)->io_stats->fscache[stat], addend);
}
#endif

--


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