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mirror_zfs/include/sys/kstat.h
Ned Bass f483a97a41 3537 add kstat_waitq_enter and friends 
These kstat interfaces are required to port
"Illumos #3537 want pool io kstats" to ZFS on Linux.

kstat_waitq_enter()
kstat_waitq_exit()
kstat_runq_enter()
kstat_runq_exit()

Additionally, zero out the ks_data buffer in __kstat_create() so
that the kstat_io_t counters are initialized to zero.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
2013-10-25 13:41:52 -07:00

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/*****************************************************************************\
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
* Copyright (C) 2007 The Regents of the University of California.
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
* UCRL-CODE-235197
*
* This file is part of the SPL, Solaris Porting Layer.
* For details, see <http://zfsonlinux.org/>.
*
* The SPL is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* The SPL is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
\*****************************************************************************/
#ifndef _SPL_KSTAT_H
#define _SPL_KSTAT_H
#include <linux/module.h>
#include <linux/proc_compat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/kmem.h>
#include <sys/mutex.h>
#define KSTAT_STRLEN 31
#define KSTAT_RAW_MAX (128*1024)
/* For reference valid classes are:
* disk, tape, net, controller, vm, kvm, hat, streams, kstat, misc
*/
#define KSTAT_TYPE_RAW 0 /* can be anything; ks_ndata >= 1 */
#define KSTAT_TYPE_NAMED 1 /* name/value pair; ks_ndata >= 1 */
#define KSTAT_TYPE_INTR 2 /* interrupt stats; ks_ndata == 1 */
#define KSTAT_TYPE_IO 3 /* I/O stats; ks_ndata == 1 */
#define KSTAT_TYPE_TIMER 4 /* event timer; ks_ndata >= 1 */
#define KSTAT_NUM_TYPES 5
#define KSTAT_DATA_CHAR 0
#define KSTAT_DATA_INT32 1
#define KSTAT_DATA_UINT32 2
#define KSTAT_DATA_INT64 3
#define KSTAT_DATA_UINT64 4
#define KSTAT_DATA_LONG 5
#define KSTAT_DATA_ULONG 6
#define KSTAT_DATA_STRING 7
#define KSTAT_NUM_DATAS 8
#define KSTAT_INTR_HARD 0
#define KSTAT_INTR_SOFT 1
#define KSTAT_INTR_WATCHDOG 2
#define KSTAT_INTR_SPURIOUS 3
#define KSTAT_INTR_MULTSVC 4
#define KSTAT_NUM_INTRS 5
#define KSTAT_FLAG_VIRTUAL 0x01
#define KSTAT_FLAG_VAR_SIZE 0x02
#define KSTAT_FLAG_WRITABLE 0x04
#define KSTAT_FLAG_PERSISTENT 0x08
#define KSTAT_FLAG_DORMANT 0x10
#define KSTAT_FLAG_UNSUPPORTED (KSTAT_FLAG_VAR_SIZE | KSTAT_FLAG_WRITABLE | \
KSTAT_FLAG_PERSISTENT | KSTAT_FLAG_DORMANT)
#define KS_MAGIC 0x9d9d9d9d
/* Dynamic updates */
#define KSTAT_READ 0
#define KSTAT_WRITE 1
struct kstat_s;
typedef struct kstat_s kstat_t;
typedef int kid_t; /* unique kstat id */
typedef int kstat_update_t(struct kstat_s *, int); /* dynamic update cb */
typedef struct kstat_module {
char ksm_name[KSTAT_STRLEN+1]; /* module name */
struct list_head ksm_module_list; /* module linkage */
struct list_head ksm_kstat_list; /* list of kstat entries */
struct proc_dir_entry *ksm_proc; /* proc entry */
} kstat_module_t;
typedef struct kstat_raw_ops {
int (*headers)(char *buf, size_t size);
int (*data)(char *buf, size_t size, void *data);
void *(*addr)(kstat_t *ksp, loff_t index);
} kstat_raw_ops_t;
struct kstat_s {
int ks_magic; /* magic value */
kid_t ks_kid; /* unique kstat ID */
hrtime_t ks_crtime; /* creation time */
hrtime_t ks_snaptime; /* last access time */
char ks_module[KSTAT_STRLEN+1]; /* provider module name */
int ks_instance; /* provider module instance */
char ks_name[KSTAT_STRLEN+1]; /* kstat name */
char ks_class[KSTAT_STRLEN+1]; /* kstat class */
uchar_t ks_type; /* kstat data type */
uchar_t ks_flags; /* kstat flags */
void *ks_data; /* kstat type-specific data */
uint_t ks_ndata; /* # of type-specific data records */
size_t ks_data_size; /* size of kstat data section */
struct proc_dir_entry *ks_proc; /* proc linkage */
kstat_update_t *ks_update; /* dynamic updates */
void *ks_private; /* private data */
kmutex_t ks_private_lock; /* kstat private data lock */
kmutex_t *ks_lock; /* kstat data lock */
struct list_head ks_list; /* kstat linkage */
kstat_module_t *ks_owner; /* kstat module linkage */
kstat_raw_ops_t ks_raw_ops; /* ops table for raw type */
char *ks_raw_buf; /* buf used for raw ops */
size_t ks_raw_bufsize; /* size of raw ops buffer */
};
typedef struct kstat_named_s {
char name[KSTAT_STRLEN]; /* name of counter */
uchar_t data_type; /* data type */
union {
char c[16]; /* 128-bit int */
int32_t i32; /* 32-bit signed int */
uint32_t ui32; /* 32-bit unsigned int */
int64_t i64; /* 64-bit signed int */
uint64_t ui64; /* 64-bit unsigned int */
long l; /* native signed long */
ulong_t ul; /* native unsigned long */
struct {
union {
char *ptr; /* NULL-term string */
char __pad[8]; /* 64-bit padding */
} addr;
uint32_t len; /* # bytes for strlen + '\0' */
} string;
} value;
} kstat_named_t;
#define KSTAT_NAMED_STR_PTR(knptr) ((knptr)->value.string.addr.ptr)
#define KSTAT_NAMED_STR_BUFLEN(knptr) ((knptr)->value.string.len)
typedef struct kstat_intr {
uint_t intrs[KSTAT_NUM_INTRS];
} kstat_intr_t;
typedef struct kstat_io {
u_longlong_t nread; /* number of bytes read */
u_longlong_t nwritten; /* number of bytes written */
uint_t reads; /* number of read operations */
uint_t writes; /* number of write operations */
hrtime_t wtime; /* cumulative wait (pre-service) time */
hrtime_t wlentime; /* cumulative wait length*time product*/
hrtime_t wlastupdate; /* last time wait queue changed */
hrtime_t rtime; /* cumulative run (service) time */
hrtime_t rlentime; /* cumulative run length*time product */
hrtime_t rlastupdate; /* last time run queue changed */
uint_t wcnt; /* count of elements in wait state */
uint_t rcnt; /* count of elements in run state */
} kstat_io_t;
typedef struct kstat_timer {
char name[KSTAT_STRLEN+1]; /* event name */
u_longlong_t num_events; /* number of events */
hrtime_t elapsed_time; /* cumulative elapsed time */
hrtime_t min_time; /* shortest event duration */
hrtime_t max_time; /* longest event duration */
hrtime_t start_time; /* previous event start time */
hrtime_t stop_time; /* previous event stop time */
} kstat_timer_t;
int spl_kstat_init(void);
void spl_kstat_fini(void);
extern void __kstat_set_raw_ops(kstat_t *ksp,
int (*headers)(char *buf, size_t size),
int (*data)(char *buf, size_t size, void *data),
void* (*addr)(kstat_t *ksp, loff_t index));
extern kstat_t *__kstat_create(const char *ks_module, int ks_instance,
const char *ks_name, const char *ks_class,
uchar_t ks_type, uint_t ks_ndata,
uchar_t ks_flags);
extern void __kstat_install(kstat_t *ksp);
extern void __kstat_delete(kstat_t *ksp);
extern void kstat_waitq_enter(kstat_io_t *);
extern void kstat_waitq_exit(kstat_io_t *);
extern void kstat_runq_enter(kstat_io_t *);
extern void kstat_runq_exit(kstat_io_t *);
#define kstat_set_raw_ops(k,h,d,a) __kstat_set_raw_ops(k,h,d,a)
#define kstat_create(m,i,n,c,t,s,f) __kstat_create(m,i,n,c,t,s,f)
#define kstat_install(k) __kstat_install(k)
#define kstat_delete(k) __kstat_delete(k)
#endif /* _SPL_KSTAT_H */
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