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TOMOYO Linux Cross Reference
Linux/include/linux/sunrpc/metrics.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  *  linux/include/linux/sunrpc/metrics.h
  4  *
  5  *  Declarations for RPC client per-operation metrics
  6  *
  7  *  Copyright (C) 2005  Chuck Lever <cel@netapp.com>
  8  *
  9  *  RPC client per-operation statistics provide latency and retry
 10  *  information about each type of RPC procedure in a given RPC program.
 11  *  These statistics are not for detailed problem diagnosis, but simply
 12  *  to indicate whether the problem is local or remote.
 13  *
 14  *  These counters are not meant to be human-readable, but are meant to be
 15  *  integrated into system monitoring tools such as "sar" and "iostat".  As
 16  *  such, the counters are sampled by the tools over time, and are never
 17  *  zeroed after a file system is mounted.  Moving averages can be computed
 18  *  by the tools by taking the difference between two instantaneous samples
 19  *  and dividing that by the time between the samples.
 20  *
 21  *  The counters are maintained in a single array per RPC client, indexed
 22  *  by procedure number.  There is no need to maintain separate counter
 23  *  arrays per-CPU because these counters are always modified behind locks.
 24  */
 25 
 26 #ifndef _LINUX_SUNRPC_METRICS_H
 27 #define _LINUX_SUNRPC_METRICS_H
 28 
 29 #include <linux/seq_file.h>
 30 #include <linux/ktime.h>
 31 #include <linux/spinlock.h>
 32 
 33 #define RPC_IOSTATS_VERS        "1.0"
 34 
 35 struct rpc_iostats {
 36         spinlock_t              om_lock;
 37 
 38         /*
 39          * These counters give an idea about how many request
 40          * transmissions are required, on average, to complete that
 41          * particular procedure.  Some procedures may require more
 42          * than one transmission because the server is unresponsive,
 43          * the client is retransmitting too aggressively, or the
 44          * requests are large and the network is congested.
 45          */
 46         unsigned long           om_ops,         /* count of operations */
 47                                 om_ntrans,      /* count of RPC transmissions */
 48                                 om_timeouts;    /* count of major timeouts */
 49 
 50         /*
 51          * These count how many bytes are sent and received for a
 52          * given RPC procedure type.  This indicates how much load a
 53          * particular procedure is putting on the network.  These
 54          * counts include the RPC and ULP headers, and the request
 55          * payload.
 56          */
 57         unsigned long long      om_bytes_sent,  /* count of bytes out */
 58                                 om_bytes_recv;  /* count of bytes in */
 59 
 60         /*
 61          * The length of time an RPC request waits in queue before
 62          * transmission, the network + server latency of the request,
 63          * and the total time the request spent from init to release
 64          * are measured.
 65          */
 66         ktime_t                 om_queue,       /* queued for xmit */
 67                                 om_rtt,         /* RPC RTT */
 68                                 om_execute;     /* RPC execution */
 69 } ____cacheline_aligned;
 70 
 71 struct rpc_task;
 72 struct rpc_clnt;
 73 
 74 /*
 75  * EXPORTed functions for managing rpc_iostats structures
 76  */
 77 
 78 #ifdef CONFIG_PROC_FS
 79 
 80 struct rpc_iostats *    rpc_alloc_iostats(struct rpc_clnt *);
 81 void                    rpc_count_iostats(const struct rpc_task *,
 82                                           struct rpc_iostats *);
 83 void                    rpc_count_iostats_metrics(const struct rpc_task *,
 84                                           struct rpc_iostats *);
 85 void                    rpc_clnt_show_stats(struct seq_file *, struct rpc_clnt *);
 86 void                    rpc_free_iostats(struct rpc_iostats *);
 87 
 88 #else  /*  CONFIG_PROC_FS  */
 89 
 90 static inline struct rpc_iostats *rpc_alloc_iostats(struct rpc_clnt *clnt) { return NULL; }
 91 static inline void rpc_count_iostats(const struct rpc_task *task,
 92                                      struct rpc_iostats *stats) {}
 93 static inline void rpc_count_iostats_metrics(const struct rpc_task *task,
 94                                              struct rpc_iostats *stats)
 95 {
 96 }
 97 
 98 static inline void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt) {}
 99 static inline void rpc_free_iostats(struct rpc_iostats *stats) {}
100 
101 #endif  /*  CONFIG_PROC_FS  */
102 
103 #endif /* _LINUX_SUNRPC_METRICS_H */
104 

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