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/
usr/
src/
linux-headers-3.0.0-14/
include/
linux/
sunrpc/
- drwxr-xr-x
|
Viewing file:  metrics.h (3.15 KB) -rw-r--r--Select action/file-type:  ( +) |  ( +) |  ( +) | Code ( +) | Session ( +) |  ( +) | SDB ( +) |  ( +) |  ( +) |  ( +) |  ( +) |  ( +) |
/*
* linux/include/linux/sunrpc/metrics.h
*
* Declarations for RPC client per-operation metrics
*
* Copyright (C) 2005 Chuck Lever <cel@netapp.com>
*
* RPC client per-operation statistics provide latency and retry
* information about each type of RPC procedure in a given RPC program.
* These statistics are not for detailed problem diagnosis, but simply
* to indicate whether the problem is local or remote.
*
* 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.
*
* The counters are maintained in a single array per RPC client, indexed
* by procedure number. There is no need to maintain separate counter
* arrays per-CPU because these counters are always modified behind locks.
*/
#ifndef _LINUX_SUNRPC_METRICS_H
#define _LINUX_SUNRPC_METRICS_H
#include <linux/seq_file.h>
#include <linux/ktime.h>
#define RPC_IOSTATS_VERS "1.0"
struct rpc_iostats {
/*
* These counters give an idea about how many request
* transmissions are required, on average, to complete that
* particular procedure. Some procedures may require more
* than one transmission because the server is unresponsive,
* the client is retransmitting too aggressively, or the
* requests are large and the network is congested.
*/
unsigned long om_ops, /* count of operations */
om_ntrans, /* count of RPC transmissions */
om_timeouts; /* count of major timeouts */
/*
* These count how many bytes are sent and received for a
* given RPC procedure type. This indicates how much load a
* particular procedure is putting on the network. These
* counts include the RPC and ULP headers, and the request
* payload.
*/
unsigned long long om_bytes_sent, /* count of bytes out */
om_bytes_recv; /* count of bytes in */
/*
* The length of time an RPC request waits in queue before
* transmission, the network + server latency of the request,
* and the total time the request spent from init to release
* are measured.
*/
ktime_t om_queue, /* queued for xmit */
om_rtt, /* RPC RTT */
om_execute; /* RPC execution */
} ____cacheline_aligned;
struct rpc_task;
struct rpc_clnt;
/*
* EXPORTed functions for managing rpc_iostats structures
*/
#ifdef CONFIG_PROC_FS
struct rpc_iostats * rpc_alloc_iostats(struct rpc_clnt *);
void rpc_count_iostats(struct rpc_task *);
void rpc_print_iostats(struct seq_file *, struct rpc_clnt *);
void rpc_free_iostats(struct rpc_iostats *);
#else /* CONFIG_PROC_FS */
static inline struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt) { return NULL; }
static inline void rpc_count_iostats(struct rpc_task *task) {}
static inline void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt) {}
static inline void rpc_free_iostats(struct rpc_iostats *stats) {}
#endif /* CONFIG_PROC_FS */
#endif /* _LINUX_SUNRPC_METRICS_H */
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