Avoids cache line ping pongs between cpus and prepare next patch,
because updates of nr_inodes metric dont need inode_lock anymore.

(socket8 bench result : 25s to 20.5s)

Signed-off-by: Eric Dumazet <dada1-fPLkHRcR87vqlBn2x/YWAg@public.gmane.org>
---
 fs/fs-writeback.c   |    2 -
 fs/inode.c          |   51 +++++++++++++++++++++++++++++++++++-------
 include/linux/fs.h  |    3 ++
 kernel/sysctl.c     |    4 +--
 mm/page-writeback.c |    2 -
 5 files changed, 50 insertions(+), 12 deletions(-)