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