]>
Commit | Line | Data |
---|---|---|
22853e4a KZ |
1 | /* |
2 | * elvtune.c - I/O elevator tuner | |
3 | * | |
4 | * Copyright (C) 2000 Andrea Arcangeli <andrea@suse.de> SuSE | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | * This file may be redistributed under the terms of the GNU General | |
20 | * Public License, version 2. | |
21 | */ | |
22 | ||
23 | #include <getopt.h> | |
24 | #include <fcntl.h> | |
25 | #include <stdio.h> | |
26 | #include <sys/ioctl.h> | |
27 | #include <unistd.h> | |
28 | #include <stdlib.h> | |
66ee8158 | 29 | #include "nls.h" |
22853e4a KZ |
30 | |
31 | /* this has to match with the kernel structure */ | |
66ee8158 | 32 | /* current version for ac19 and 2.2.16 */ |
22853e4a | 33 | typedef struct blkelv_ioctl_arg_s { |
66ee8158 | 34 | int queue_ID; |
22853e4a KZ |
35 | int read_latency; |
36 | int write_latency; | |
37 | int max_bomb_segments; | |
38 | } blkelv_ioctl_arg_t; | |
39 | ||
66ee8158 KZ |
40 | #define BLKELVGET _IOR(0x12,106,sizeof(blkelv_ioctl_arg_t)) |
41 | #define BLKELVSET _IOW(0x12,107,sizeof(blkelv_ioctl_arg_t)) | |
42 | ||
22853e4a KZ |
43 | static void |
44 | usage(void) { | |
66ee8158 KZ |
45 | fprintf(stderr, "elvtune (%s)\n", util_linux_version); |
46 | fprintf(stderr, _("usage:\n")); | |
47 | fprintf(stderr, "\telvtune [-r r_lat] [-w w_lat] [-b b_lat]" | |
48 | " /dev/blkdev1 [/dev/blkdev2...]\n"); | |
22853e4a KZ |
49 | fprintf(stderr, "\telvtune -h\n"); |
50 | fprintf(stderr, "\telvtune -v\n"); | |
51 | } | |
52 | ||
53 | static void | |
54 | version(void) { | |
66ee8158 | 55 | fprintf(stderr, "elvtune (%s)\n", util_linux_version); |
22853e4a KZ |
56 | } |
57 | ||
58 | int | |
59 | main(int argc, char * argv[]) { | |
60 | int read_value = 0xbeefbeef, write_value = 0xbeefbeef, bomb_value = 0xbeefbeef; | |
61 | int read_set, write_set, bomb_set, set; | |
62 | char * devname; | |
63 | int fd; | |
64 | blkelv_ioctl_arg_t elevator; | |
65 | ||
66 | read_set = write_set = bomb_set = set = 0; | |
67 | ||
68 | for (;;) { | |
69 | int opt; | |
70 | ||
71 | opt = getopt(argc, argv, "r:w:b:hv"); | |
72 | if (opt < 0) | |
73 | break; | |
74 | switch (opt) { | |
75 | case 'r': | |
76 | read_value = atoi(optarg); | |
77 | read_set = set = 1; | |
78 | break; | |
79 | case 'w': | |
80 | write_value = atoi(optarg); | |
81 | write_set = set = 1; | |
82 | break; | |
83 | case 'b': | |
84 | bomb_value = atoi(optarg); | |
85 | bomb_set = set = 1; | |
86 | break; | |
87 | ||
88 | case 'h': | |
89 | usage(), exit(0); | |
90 | case 'v': | |
91 | version(), exit(0); | |
92 | ||
93 | case '?': | |
94 | default: | |
95 | case ':': | |
96 | fprintf(stderr, "parse error\n"); | |
97 | exit(1); | |
98 | } | |
99 | } | |
100 | ||
101 | if (optind >= argc) | |
102 | fprintf(stderr, "missing blockdevice, use -h for help\n"), exit(1); | |
103 | ||
104 | while (optind < argc) { | |
105 | devname = argv[optind++]; | |
106 | ||
107 | fd = open(devname, O_RDONLY|O_NONBLOCK); | |
108 | if (fd < 0) { | |
109 | perror("open"); | |
110 | break; | |
111 | } | |
112 | ||
113 | if (ioctl(fd, BLKELVGET, &elevator) < 0) { | |
114 | perror("ioctl get"); | |
115 | break; | |
116 | } | |
117 | ||
118 | if (set) { | |
119 | if (read_set) | |
120 | elevator.read_latency = read_value; | |
121 | if (write_set) | |
122 | elevator.write_latency = write_value; | |
123 | if (bomb_set) | |
124 | elevator.max_bomb_segments = bomb_value; | |
125 | ||
126 | if (ioctl(fd, BLKELVSET, &elevator) < 0) { | |
127 | perror("ioctl set"); | |
128 | break; | |
129 | } | |
130 | if (ioctl(fd, BLKELVGET, &elevator) < 0) { | |
131 | perror("ioctl reget"); | |
132 | break; | |
133 | } | |
134 | } | |
135 | ||
66ee8158 | 136 | printf("\n%s elevator ID\t\t%d\n", devname, elevator.queue_ID); |
22853e4a KZ |
137 | printf("\tread_latency:\t\t%d\n", elevator.read_latency); |
138 | printf("\twrite_latency:\t\t%d\n", elevator.write_latency); | |
139 | printf("\tmax_bomb_segments:\t%d\n\n", elevator.max_bomb_segments); | |
140 | ||
141 | if (close(fd) < 0) { | |
142 | perror("close"); | |
143 | break; | |
144 | } | |
145 | } | |
146 | ||
147 | return 0; | |
148 | } |