tree 01ec0e16b19d7e418f26f1218113bb0f90b1a2e1
parent c8bded96aa8735823e53c95a26177987ebb19a90
author Chuck Lever <cel@netapp.com> 1142880253 -0500
committer Trond Myklebust <Trond.Myklebust@netapp.com> 1142880253 -0500

NFS: introduce mechanism for tracking NFS client metrics

Add a per-superblock performance counter facility to the NFS client.  This
facility mimics the counters available for block devices and for
networking.  Expose these new counters via the new /proc/self/mountstats
interface.

Thanks to Andrew Morton and Trond Myklebust for their review and comments.

Test plan:
fsx and iozone on UP and SMP systems, with and without pre-emption.  Watch
for memory overwrite bugs, and performance loss (significantly more CPU
required per op).

Signed-off-by: Chuck Lever <cel@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>