cregit-Linux how code gets into the kernel

Release 4.12 include/linux/sunrpc/metrics.h

 *  linux/include/linux/sunrpc/metrics.h
 *  Declarations for RPC client per-operation metrics
 *  Copyright (C) 2005  Chuck Lever <>
 *  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.



#include <linux/seq_file.h>
#include <linux/ktime.h>
#include <linux/spinlock.h>

#define RPC_IOSTATS_VERS	"1.0"

struct rpc_iostats {
spinlock_t		om_lock;

         * 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


struct rpc_iostats *	rpc_alloc_iostats(struct rpc_clnt *);
void			rpc_count_iostats(const struct rpc_task *,
					  struct rpc_iostats *);
void			rpc_count_iostats_metrics(const struct rpc_task *,
					  struct rpc_iostats *);
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; }


Adrian Bunk17100.00%1100.00%

static inline void rpc_count_iostats(const struct rpc_task *task, struct rpc_iostats *stats) {}


Adrian Bunk1164.71%150.00%
Weston Andros Adamson635.29%150.00%

static inline void rpc_count_iostats_metrics(const struct rpc_task *task, struct rpc_iostats *stats) { }


Tom Haynes1482.35%150.00%
Trond Myklebust317.65%150.00%

static inline void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt) {}


Adrian Bunk16100.00%1100.00%

static inline void rpc_free_iostats(struct rpc_iostats *stats) {}


Adrian Bunk11100.00%1100.00%

#endif /* CONFIG_PROC_FS */ #endif /* _LINUX_SUNRPC_METRICS_H */

Overall Contributors

Chuck Lever11051.16%337.50%
Adrian Bunk6429.77%112.50%
Weston Andros Adamson2411.16%225.00%
Tom Haynes146.51%112.50%
Trond Myklebust31.40%112.50%
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