*
* Copyright (C) 2005, 2006 Chuck Lever <cel@netapp.com>
*
- * NFS client per-mount statistics provide information about the health of
- * the NFS client and the health of each NFS mount point. Generally these
- * are not for detailed problem diagnosis, but simply to indicate that there
- * is a problem.
- *
- * These counters are not meant to be human-readable, but are meant to be
- * integrated into system monitoring tools such as "sar" and "iostat". As
- * such, the counters are sampled by the tools over time, and are never
- * zeroed after a file system is mounted. Moving averages can be computed
- * by the tools by taking the difference between two instantaneous samples
- * and dividing that by the time between the samples.
*/
#ifndef _NFS_IOSTAT
#define _NFS_IOSTAT
-#define NFS_IOSTAT_VERS "1.0"
-
-/*
- * NFS byte counters
- *
- * 1. SERVER - the number of payload bytes read from or written to the
- * server by the NFS client via an NFS READ or WRITE request.
- *
- * 2. NORMAL - the number of bytes read or written by applications via
- * the read(2) and write(2) system call interfaces.
- *
- * 3. DIRECT - the number of bytes read or written from files opened
- * with the O_DIRECT flag.
- *
- * These counters give a view of the data throughput into and out of the NFS
- * client. Comparing the number of bytes requested by an application with the
- * number of bytes the client requests from the server can provide an
- * indication of client efficiency (per-op, cache hits, etc).
- *
- * These counters can also help characterize which access methods are in
- * use. DIRECT by itself shows whether there is any O_DIRECT traffic.
- * NORMAL + DIRECT shows how much data is going through the system call
- * interface. A large amount of SERVER traffic without much NORMAL or
- * DIRECT traffic shows that applications are using mapped files.
- *
- * NFS page counters
- *
- * These count the number of pages read or written via nfs_readpage(),
- * nfs_readpages(), or their write equivalents.
- */
-enum nfs_stat_bytecounters {
- NFSIOS_NORMALREADBYTES = 0,
- NFSIOS_NORMALWRITTENBYTES,
- NFSIOS_DIRECTREADBYTES,
- NFSIOS_DIRECTWRITTENBYTES,
- NFSIOS_SERVERREADBYTES,
- NFSIOS_SERVERWRITTENBYTES,
- NFSIOS_READPAGES,
- NFSIOS_WRITEPAGES,
- __NFSIOS_BYTESMAX,
-};
-
-/*
- * NFS event counters
- *
- * These counters provide a low-overhead way of monitoring client activity
- * without enabling NFS trace debugging. The counters show the rate at
- * which VFS requests are made, and how often the client invalidates its
- * data and attribute caches. This allows system administrators to monitor
- * such things as how close-to-open is working, and answer questions such
- * as "why are there so many GETATTR requests on the wire?"
- *
- * They also count anamolous events such as short reads and writes, silly
- * renames due to close-after-delete, and operations that change the size
- * of a file (such operations can often be the source of data corruption
- * if applications aren't using file locking properly).
- */
-enum nfs_stat_eventcounters {
- NFSIOS_INODEREVALIDATE = 0,
- NFSIOS_DENTRYREVALIDATE,
- NFSIOS_DATAINVALIDATE,
- NFSIOS_ATTRINVALIDATE,
- NFSIOS_VFSOPEN,
- NFSIOS_VFSLOOKUP,
- NFSIOS_VFSACCESS,
- NFSIOS_VFSUPDATEPAGE,
- NFSIOS_VFSREADPAGE,
- NFSIOS_VFSREADPAGES,
- NFSIOS_VFSWRITEPAGE,
- NFSIOS_VFSWRITEPAGES,
- NFSIOS_VFSGETDENTS,
- NFSIOS_VFSSETATTR,
- NFSIOS_VFSFLUSH,
- NFSIOS_VFSFSYNC,
- NFSIOS_VFSLOCK,
- NFSIOS_VFSRELEASE,
- NFSIOS_CONGESTIONWAIT,
- NFSIOS_SETATTRTRUNC,
- NFSIOS_EXTENDWRITE,
- NFSIOS_SILLYRENAME,
- NFSIOS_SHORTREAD,
- NFSIOS_SHORTWRITE,
- NFSIOS_DELAY,
- __NFSIOS_COUNTSMAX,
-};
-
-#ifdef __KERNEL__
-
#include <linux/percpu.h>
#include <linux/cache.h>
+#include <linux/nfs_iostat.h>
struct nfs_iostats {
unsigned long long bytes[__NFSIOS_BYTESMAX];
unsigned long events[__NFSIOS_COUNTSMAX];
} ____cacheline_aligned;
-static inline void nfs_inc_server_stats(struct nfs_server *server, enum nfs_stat_eventcounters stat)
+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] ++;
+ iostats->events[stat]++;
put_cpu_no_resched();
}
-static inline void nfs_inc_stats(struct inode *inode, enum nfs_stat_eventcounters stat)
+static inline void nfs_inc_stats(const struct inode *inode,
+ enum nfs_stat_eventcounters stat)
{
nfs_inc_server_stats(NFS_SERVER(inode), stat);
}
-static inline void nfs_add_server_stats(struct nfs_server *server, enum nfs_stat_bytecounters stat, unsigned long addend)
+static inline void nfs_add_server_stats(const struct nfs_server *server,
+ enum nfs_stat_bytecounters stat,
+ unsigned long addend)
{
struct nfs_iostats *iostats;
int cpu;
put_cpu_no_resched();
}
-static inline void nfs_add_stats(struct inode *inode, enum nfs_stat_bytecounters stat, unsigned long addend)
+static inline void nfs_add_stats(const struct inode *inode,
+ enum nfs_stat_bytecounters stat,
+ unsigned long addend)
{
nfs_add_server_stats(NFS_SERVER(inode), stat, addend);
}
free_percpu(stats);
}
-#endif
-#endif
+#endif /* _NFS_IOSTAT */
git.openpandora.org / pandora-kernel.git / blobdiff