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d76c5b81 AB |
1 | /* |
2 | * blktrace output analysis: generate a timeline & gather statistics | |
3 | * | |
4 | * Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com> | |
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <stdio.h> | |
23 | #include <unistd.h> | |
24 | #include <sys/types.h> | |
25 | #include <sys/stat.h> | |
26 | #include <fcntl.h> | |
d76c5b81 AB |
27 | #include <sys/mman.h> |
28 | #include <string.h> | |
29 | ||
30 | #include "blktrace.h" | |
e6855475 | 31 | #include "globals.h" |
d76c5b81 AB |
32 | |
33 | #define DEF_LEN (16 * 1024 * 1024) | |
34 | ||
35 | static int fd; | |
36 | static void *cur_map = MAP_FAILED; | |
37 | static off_t cur_min, cur, cur_max, total_size; | |
38 | static size_t len; | |
39 | static struct blk_io_trace *next_t; | |
40 | static long pgsz; | |
41 | ||
42 | int data_is_native = -1; | |
43 | ||
c053af42 AB |
44 | static inline size_t min_len(size_t a, size_t b) |
45 | { | |
46 | return a < b ? a : b; | |
47 | } | |
d76c5b81 | 48 | |
8b10aae0 AB |
49 | static inline size_t convert_to_cpu(struct blk_io_trace *t, |
50 | struct blk_io_trace *tp, | |
d76c5b81 AB |
51 | void **pdu) |
52 | { | |
53 | if (data_is_native == -1) | |
54 | check_data_endianness(t->magic); | |
55 | ||
56 | if (data_is_native) | |
57 | memcpy(tp, t, sizeof(*tp)); | |
58 | else { | |
59 | tp->magic = be32_to_cpu(t->magic); | |
60 | tp->sequence = be32_to_cpu(t->sequence); | |
61 | tp->time = be64_to_cpu(t->time); | |
62 | tp->sector = be64_to_cpu(t->sector); | |
63 | tp->bytes = be32_to_cpu(t->bytes); | |
64 | tp->action = be32_to_cpu(t->action); | |
65 | tp->pid = be32_to_cpu(t->pid); | |
66 | tp->device = be32_to_cpu(t->device); | |
67 | tp->cpu = be16_to_cpu(t->cpu); | |
68 | tp->error = be16_to_cpu(t->error); | |
69 | tp->pdu_len = be16_to_cpu(t->pdu_len); | |
70 | } | |
71 | ||
d76c5b81 AB |
72 | if (tp->pdu_len) { |
73 | *pdu = malloc(tp->pdu_len); | |
74 | memcpy(*pdu, t+1, tp->pdu_len); | |
c053af42 | 75 | } else |
d76c5b81 AB |
76 | *pdu = NULL; |
77 | ||
78 | return sizeof(*tp) + tp->pdu_len; | |
79 | } | |
80 | ||
81 | static int move_map(void) | |
82 | { | |
83 | if (cur_map != MAP_FAILED) | |
84 | munmap(cur_map, len); | |
85 | ||
86 | cur_min = (cur & ~(pgsz-1)); | |
87 | len = min_len(DEF_LEN, total_size - cur_min); | |
88 | if (len < sizeof(*next_t)) | |
89 | return 0; | |
90 | ||
91 | cur_map = mmap(NULL, len, PROT_READ, MAP_SHARED, fd, | |
92 | cur_min); | |
93 | if (cur_map == MAP_FAILED) { | |
94 | perror("mmap"); | |
95 | exit(1); | |
96 | } | |
97 | ||
98 | cur_max = cur_min + len; | |
99 | return (cur < cur_max); | |
100 | } | |
101 | ||
102 | void setup_ifile(char *fname) | |
103 | { | |
104 | struct stat buf; | |
105 | ||
106 | pgsz = sysconf(_SC_PAGESIZE); | |
107 | ||
e6855475 | 108 | fd = my_open(fname, O_RDONLY); |
d76c5b81 AB |
109 | if (fd < 0) { |
110 | perror(fname); | |
111 | exit(1); | |
112 | } | |
113 | if (fstat(fd, &buf) < 0) { | |
114 | perror(fname); | |
115 | exit(1); | |
116 | } | |
117 | total_size = buf.st_size; | |
118 | ||
119 | if (!move_map()) | |
120 | exit(0); | |
121 | } | |
122 | ||
123 | void cleanup_ifile(void) | |
124 | { | |
125 | if (cur_map != MAP_FAILED) | |
126 | munmap(cur_map, len); | |
127 | close(fd); | |
128 | } | |
129 | ||
130 | int next_trace(struct blk_io_trace *t, void **pdu) | |
131 | { | |
132 | size_t this_len; | |
133 | ||
134 | if ((cur + 512) > cur_max) | |
c053af42 AB |
135 | if (!move_map()) { |
136 | cleanup_ifile(); | |
d76c5b81 | 137 | return 0; |
c053af42 | 138 | } |
d76c5b81 AB |
139 | |
140 | next_t = cur_map + (cur - cur_min); | |
141 | this_len = convert_to_cpu(next_t, t, pdu); | |
142 | cur += this_len; | |
143 | ||
144 | return 1; | |
145 | } | |
32ff7e3b AB |
146 | |
147 | double pct_done(void) | |
148 | { | |
149 | return 100.0 * ((double)cur / (double)total_size); | |
150 | } |