mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 15:36:45 +07:00
6a51091d07
Add some new NFS I/O counters for FS-Cache doing things for NFS. A new line is emitted into /proc/pid/mountstats if caching is enabled that looks like: fsc: <rok> <rfl> <wok> <wfl> <unc> Where <rok> is the number of pages read successfully from the cache, <rfl> is the number of failed page reads against the cache, <wok> is the number of successful page writes to the cache, <wfl> is the number of failed page writes to the cache, and <unc> is the number of NFS pages that have been disconnected from the cache. Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Steve Dickson <steved@redhat.com> Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
132 lines
4.1 KiB
C
132 lines
4.1 KiB
C
/*
|
|
* User-space visible declarations for NFS client per-mount
|
|
* point 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 _LINUX_NFS_IOSTAT
|
|
#define _LINUX_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.
|
|
*
|
|
* NB: When adding new byte counters, please include the measured
|
|
* units in the name of each byte counter to help users of this
|
|
* interface determine what exactly is being counted.
|
|
*/
|
|
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,
|
|
};
|
|
|
|
/*
|
|
* NFS local caching servicing counters
|
|
*/
|
|
enum nfs_stat_fscachecounters {
|
|
NFSIOS_FSCACHE_PAGES_READ_OK,
|
|
NFSIOS_FSCACHE_PAGES_READ_FAIL,
|
|
NFSIOS_FSCACHE_PAGES_WRITTEN_OK,
|
|
NFSIOS_FSCACHE_PAGES_WRITTEN_FAIL,
|
|
NFSIOS_FSCACHE_PAGES_UNCACHED,
|
|
__NFSIOS_FSCACHEMAX,
|
|
};
|
|
|
|
#endif /* _LINUX_NFS_IOSTAT */
|