120 lines
3.8 KiB
C
120 lines
3.8 KiB
C
/*
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* User-space visible declarations for NFS client per-mount
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* point 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
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* health of the NFS client and the health of each NFS mount point.
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* Generally these are not for detailed problem diagnosis, but
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* simply to indicate that there is a problem.
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*
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* These counters are not meant to be human-readable, but are meant
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* to be integrated into system monitoring tools such as "sar" and
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* "iostat". As such, the counters are sampled by the tools over
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* time, and are never zeroed after a file system is mounted.
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* Moving averages can be computed by the tools by taking the
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* difference between two instantaneous samples and dividing that
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* by the time between the samples.
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*/
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#ifndef _LINUX_NFS_IOSTAT
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#define _LINUX_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
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* to the server by the NFS client via an NFS READ or WRITE
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* request.
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*
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* 2. NORMAL - the number of bytes read or written by applications
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* via 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
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* opened 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
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* of the NFS client. Comparing the number of bytes requested by
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* an application with the number of bytes the client requests from
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* the server can provide an indication of client efficiency
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* (per-op, cache hits, etc).
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*
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* These counters can also help characterize which access methods
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* are in use. DIRECT by itself shows whether there is any O_DIRECT
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* traffic. NORMAL + DIRECT shows how much data is going through
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* the system call interface. A large amount of SERVER traffic
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* without much NORMAL or DIRECT traffic shows that applications
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* 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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* NB: When adding new byte counters, please include the measured
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* units in the name of each byte counter to help users of this
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* interface determine what exactly is being counted.
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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
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* activity without enabling NFS trace debugging. The counters
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* show the rate at which VFS requests are made, and how often the
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* client invalidates its data and attribute caches. This allows
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* system administrators to monitor such things as how close-to-open
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* is working, and answer questions such as "why are there so many
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* GETATTR requests on the wire?"
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*
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* They also count anamolous events such as short reads and writes,
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* silly renames due to close-after-delete, and operations that
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* change the size of a file (such operations can often be the
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* source of data corruption if applications aren't using file
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* 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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#endif /* _LINUX_NFS_IOSTAT */
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