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- /*
- * 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>
- #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.
- */
- unsigned long long om_queue, /* jiffies queued for xmit */
- om_rtt, /* jiffies for RPC RTT */
- om_execute; /* jiffies for 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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