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NFS: introduce mechanism for tracking NFS client metrics

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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>
This commit is contained in:
Chuck Lever
2006-03-20 13:44:13 -05:00
committed by Trond Myklebust
parent c8bded96aa
commit d9ef5a8c26
3 changed files with 252 additions and 6 deletions
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3
include/linux/nfs_fs_sb.h
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@ -4,6 +4,8 @@
#include <linux/list.h>
#include <linux/backing-dev.h>
struct nfs_iostats;
/*
* NFS client parameters stored in the superblock.
*/
@ -12,6 +14,7 @@ struct nfs_server {
struct rpc_clnt * client_sys; /* 2nd handle for FSINFO */
struct rpc_clnt * client_acl; /* ACL RPC client handle */
struct nfs_rpc_ops * rpc_ops; /* NFS protocol vector */
struct nfs_iostats * io_stats; /* I/O statistics */
struct backing_dev_info backing_dev_info;
int flags; /* various flags */
unsigned int caps; /* server capabilities */