1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
|
/*
Copyright (c) 2006-2009 Z RESEARCH, Inc. <http://www.zresearch.com>
This file is part of GlusterFS.
GlusterFS 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 3 of the License,
or (at your option) any later version.
GlusterFS 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 this program. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifndef __IOT_H
#define __IOT_H
#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif
#include "compat-errno.h"
#include "glusterfs.h"
#include "logging.h"
#include "dict.h"
#include "xlator.h"
#include "common-utils.h"
#include "list.h"
#include <stdlib.h>
#define min(a,b) ((a)<(b)?(a):(b))
#define max(a,b) ((a)>(b)?(a):(b))
struct iot_conf;
struct iot_worker;
struct iot_request;
struct iot_request {
struct list_head list; /* Attaches this request to the list of
requests.
*/
call_stub_t *stub;
};
#define IOT_STATE_ACTIVE 1
#define IOT_STATE_DEAD 2
#define iot_worker_active(wrk) ((wrk)->state == IOT_STATE_ACTIVE)
#define MAX_IDLE_SKEW 1000 /* usecs */
#define skew_usec_idle_time(usec) ((usec) + (random () % MAX_IDLE_SKEW))
#define IOT_DEFAULT_IDLE 180 /* In secs. */
#define IOT_MIN_THREADS 32
#define IOT_MAX_THREADS 512
#define IOT_SCALING_OFF 1
#define IOT_SCALING_ON 2
#define iot_ordered_scaling_on(conf) ((conf)->o_scaling == IOT_SCALING_ON)
#define iot_unordered_scaling_on(conf) ((conf)->u_scaling == IOT_SCALING_ON)
struct iot_worker {
struct list_head rqlist; /* List of requests assigned to me. */
struct iot_conf *conf;
int64_t q,dq;
pthread_cond_t dq_cond;
pthread_mutex_t qlock;
int32_t queue_size;
pthread_t thread;
int state; /* What state is the thread in. */
int thread_idx; /* Thread's index into the worker array. Since this
will be thread local data, for ensuring that number
of threads dont fall below a minimum, we just dont
allow threads with specific indices to exit.
Helps us in eliminating one place where otherwise
a lock would have been required to update centralized
state inside conf.
*/
};
struct iot_conf {
int32_t thread_count;
struct iot_worker ** workers;
xlator_t *this;
/* Config state for ordered threads. */
pthread_mutex_t otlock; /* Used to sync any state that needs to be
changed by the ordered threads.
*/
int max_o_threads; /* Max. number of ordered threads */
int min_o_threads; /* Min. number of ordered threads. Ordered
thread count never falls below this
threshold.
*/
int o_idle_time; /* in Secs. The idle time after which an
ordered thread exits.
*/
int o_scaling; /* Set to IOT_SCALING_OFF if user does not want
thread scaling on ordered threads.
If scaling is off, io-threads maintains
at least min_o_threads number of threads
and never lets any thread exit.
*/
struct iot_worker **oworkers; /* Ordered thread pool. */
/* Config state for unordered threads */
pthread_mutex_t utlock; /* Used for scaling un-ordered threads. */
struct iot_worker **uworkers; /* Un-ordered thread pool. */
int max_u_threads; /* Number of unordered threads will not be
higher than this.
*/
int min_u_threads; /* Number of unordered threads should not
fall below this value. */
int u_idle_time; /* If an unordered thread does not get a
request for this amount of secs, it should
try to die.
*/
int u_scaling; /* Set to IOT_SCALING_OFF if user does not want
thread scaling on unordered threads.
If scaling is off, io-threads maintains
at least min_u_threads number of threads
and never lets any thread exit.
*/
};
typedef struct iot_conf iot_conf_t;
typedef struct iot_worker iot_worker_t;
typedef struct iot_request iot_request_t;
#endif /* __IOT_H */
|
