| /* |
| * linux/fs/nfs/iostat.h |
| * |
| * Declarations for NFS client per-mount statistics |
| * |
| * 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> |
| |
| 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) |
| { |
| struct nfs_iostats *iostats; |
| int cpu; |
| |
| cpu = get_cpu(); |
| iostats = per_cpu_ptr(server->io_stats, cpu); |
| iostats->events[stat] ++; |
| put_cpu_no_resched(); |
| } |
| |
| static inline void nfs_inc_stats(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) |
| { |
| struct nfs_iostats *iostats; |
| int cpu; |
| |
| cpu = get_cpu(); |
| iostats = per_cpu_ptr(server->io_stats, cpu); |
| iostats->bytes[stat] += addend; |
| put_cpu_no_resched(); |
| } |
| |
| static inline void nfs_add_stats(struct inode *inode, enum nfs_stat_bytecounters stat, unsigned long addend) |
| { |
| nfs_add_server_stats(NFS_SERVER(inode), stat, addend); |
| } |
| |
| static inline struct nfs_iostats *nfs_alloc_iostats(void) |
| { |
| return alloc_percpu(struct nfs_iostats); |
| } |
| |
| static inline void nfs_free_iostats(struct nfs_iostats *stats) |
| { |
| free_percpu(stats); |
| } |
| |
| #endif |
| #endif |