Commit | Line | Data |
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5225e788 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 | #include "globals.h" | |
22 | ||
6eb42155 | 23 | static struct file_info *seek_files = NULL; |
b2ecdd0f | 24 | |
5225e788 | 25 | struct seek_bkt { |
6eb42155 | 26 | struct rb_node rb_node; |
5225e788 AB |
27 | long long sectors; |
28 | int nseeks; | |
29 | }; | |
30 | ||
31 | struct seeki { | |
69040794 | 32 | FILE *rfp, *wfp, *cfp; |
6eb42155 ADB |
33 | struct rb_root root; |
34 | long long tot_seeks; | |
5225e788 AB |
35 | double total_sectors; |
36 | long long last_start, last_end; | |
37 | }; | |
38 | ||
4c48f14e | 39 | static FILE *seek_open(char *str, char rw) |
5225e788 AB |
40 | { |
41 | FILE *fp; | |
42 | char *oname; | |
5225e788 AB |
43 | |
44 | if (seek_name == NULL) return NULL; | |
45 | ||
4c48f14e AB |
46 | oname = malloc(strlen(seek_name) + strlen(str) + 32); |
47 | sprintf(oname, "%s_%s_%c.dat", seek_name, str, rw); | |
5225e788 AB |
48 | if ((fp = fopen(oname, "w")) == NULL) |
49 | perror(oname); | |
b2ecdd0f | 50 | else |
6eb42155 | 51 | add_file(&seek_files, fp, oname); |
5225e788 AB |
52 | |
53 | return fp; | |
54 | } | |
55 | ||
6eb42155 ADB |
56 | static void __insert(struct rb_root *root, long long sectors) |
57 | { | |
58 | struct seek_bkt *sbp; | |
59 | struct rb_node *parent = NULL; | |
60 | struct rb_node **p = &root->rb_node; | |
61 | ||
62 | while (*p) { | |
63 | parent = *p; | |
64 | sbp = rb_entry(parent, struct seek_bkt, rb_node); | |
65 | if (sectors < sbp->sectors) | |
66 | p = &(*p)->rb_left; | |
67 | else if (sectors > sbp->sectors) | |
68 | p = &(*p)->rb_right; | |
69 | else { | |
70 | sbp->nseeks++; | |
71 | return; | |
72 | } | |
73 | } | |
74 | ||
75 | sbp = malloc(sizeof(struct seek_bkt)); | |
76 | sbp->nseeks = 1; | |
77 | sbp->sectors = sectors; | |
78 | ||
79 | rb_link_node(&sbp->rb_node, parent, p); | |
80 | rb_insert_color(&sbp->rb_node, root); | |
81 | } | |
82 | ||
69040794 AB |
83 | static void __destroy(struct rb_node *n) |
84 | { | |
85 | if (n) { | |
86 | struct seek_bkt *sbp = rb_entry(n, struct seek_bkt, rb_node); | |
87 | ||
88 | __destroy(n->rb_left); | |
89 | __destroy(n->rb_right); | |
90 | free(sbp); | |
91 | } | |
92 | } | |
93 | ||
b2ecdd0f ADB |
94 | void seek_clean(void) |
95 | { | |
6eb42155 | 96 | clean_files(&seek_files); |
b2ecdd0f ADB |
97 | } |
98 | ||
5225e788 AB |
99 | long long seek_dist(struct seeki *sip, struct io *iop) |
100 | { | |
101 | long long dist; | |
102 | long long start = BIT_START(iop), end = BIT_END(iop); | |
103 | ||
69040794 | 104 | if (seek_absolute) |
5225e788 | 105 | dist = start - sip->last_end; |
69040794 AB |
106 | else { |
107 | /* Some overlap means no seek */ | |
108 | if (((sip->last_start <= start) && (start <= sip->last_end)) || | |
109 | ((sip->last_start <= end) && (end <= sip->last_end))) | |
110 | dist = 0; | |
111 | else if (start > sip->last_end) | |
112 | dist = start - sip->last_end; | |
113 | else | |
114 | dist = start - sip->last_start; | |
115 | ||
116 | } | |
5225e788 AB |
117 | |
118 | sip->last_start = start; | |
119 | sip->last_end = end; | |
120 | return dist; | |
121 | } | |
122 | ||
4c48f14e | 123 | void *seeki_init(char *str) |
5225e788 AB |
124 | { |
125 | struct seeki *sip = malloc(sizeof(struct seeki)); | |
126 | ||
4c48f14e AB |
127 | sip->rfp = seek_open(str, 'r'); |
128 | sip->wfp = seek_open(str, 'w'); | |
129 | sip->cfp = seek_open(str, 'c'); | |
6eb42155 | 130 | sip->tot_seeks = 0; |
5225e788 AB |
131 | sip->total_sectors = 0.0; |
132 | sip->last_start = sip->last_end = 0; | |
6eb42155 | 133 | memset(&sip->root, 0, sizeof(sip->root)); |
5225e788 AB |
134 | |
135 | return sip; | |
136 | } | |
137 | ||
69040794 AB |
138 | void seeki_exit(void *param) |
139 | { | |
140 | struct seeki *sip = param; | |
141 | ||
142 | /* | |
143 | * Associated files are cleaned up by seek_clean | |
144 | */ | |
145 | __destroy(sip->root.rb_node); | |
146 | free(sip); | |
147 | } | |
148 | ||
5225e788 AB |
149 | void seeki_add(void *handle, struct io *iop) |
150 | { | |
5225e788 | 151 | struct seeki *sip = handle; |
69040794 | 152 | char rw = IOP_READ(iop) ? 'r' : 'w'; |
5225e788 | 153 | long long dist = seek_dist(sip, iop); |
69040794 | 154 | double tstamp = BIT_TIME(iop->t.time); |
5225e788 AB |
155 | FILE *fp = IOP_READ(iop) ? sip->rfp : sip->wfp; |
156 | ||
157 | if (fp) | |
69040794 AB |
158 | fprintf(fp, "%15.9lf %13lld %c\n", tstamp, dist, rw); |
159 | if (sip->cfp) | |
160 | fprintf(sip->cfp, "%15.9lf %13lld %c\n", tstamp, dist, rw); | |
5225e788 AB |
161 | |
162 | dist = llabs(dist); | |
6eb42155 | 163 | sip->tot_seeks++; |
5225e788 | 164 | sip->total_sectors += dist; |
6eb42155 | 165 | __insert(&sip->root, dist); |
5225e788 AB |
166 | } |
167 | ||
168 | long long seeki_nseeks(void *handle) | |
169 | { | |
6eb42155 | 170 | return ((struct seeki *)handle)->tot_seeks; |
5225e788 AB |
171 | } |
172 | ||
173 | double seeki_mean(void *handle) | |
174 | { | |
175 | struct seeki *sip = handle; | |
6eb42155 ADB |
176 | return sip->total_sectors / sip->tot_seeks; |
177 | } | |
178 | ||
179 | int __median(struct rb_node *n, long long sofar, long long target, long | |
180 | long *rvp) | |
181 | { | |
182 | struct seek_bkt *sbp; | |
183 | ||
184 | sbp = rb_entry(n, struct seek_bkt, rb_node); | |
185 | if ((sofar + sbp->nseeks) >= target) { | |
186 | *rvp = sbp->sectors; | |
187 | return 1; | |
188 | } | |
189 | ||
190 | if (n->rb_left && __median(n->rb_left, sofar, target, rvp)) | |
191 | return 1; | |
192 | ||
193 | if (n->rb_right && __median(n->rb_right, sofar, target, rvp)) | |
194 | return 1; | |
195 | ||
196 | return 0; | |
197 | ||
5225e788 AB |
198 | } |
199 | ||
200 | long long seeki_median(void *handle) | |
201 | { | |
6eb42155 | 202 | long long rval = 0LL; |
5225e788 | 203 | struct seeki *sip = handle; |
5225e788 | 204 | |
6eb42155 ADB |
205 | if (sip->root.rb_node) |
206 | (void)__median(sip->root.rb_node, 0LL, sip->tot_seeks / 2, | |
207 | &rval); | |
5225e788 | 208 | |
6eb42155 | 209 | return rval; |
5225e788 AB |
210 | } |
211 | ||
6eb42155 ADB |
212 | void __mode(struct rb_node *n, struct mode *mp) |
213 | { | |
214 | struct seek_bkt *sbp; | |
215 | ||
216 | if (n->rb_left) __mode(n->rb_left, mp); | |
217 | if (n->rb_right) __mode(n->rb_right, mp); | |
218 | ||
219 | sbp = rb_entry(n, struct seek_bkt, rb_node); | |
220 | if (mp->modes == NULL) { | |
221 | mp->modes = malloc(sizeof(long long)); | |
222 | mp->nmds = 0; | |
223 | } | |
224 | else if (sbp->nseeks > mp->most_seeks) | |
225 | mp->nmds = 0; | |
226 | else if (sbp->nseeks == mp->most_seeks) | |
227 | mp->modes = realloc(mp->modes, (mp->nmds + 1) * | |
228 | sizeof(long long)); | |
229 | else | |
230 | return; | |
231 | ||
232 | mp->most_seeks = sbp->nseeks; | |
233 | mp->modes[mp->nmds++] = sbp->sectors; | |
234 | } | |
235 | ||
236 | int seeki_mode(void *handle, struct mode *mp) | |
5225e788 | 237 | { |
5225e788 | 238 | struct seeki *sip = handle; |
6eb42155 ADB |
239 | struct rb_root *root = &sip->root; |
240 | ||
241 | memset(mp, 0, sizeof(struct mode)); | |
242 | if (root->rb_node) | |
243 | __mode(root->rb_node, mp); | |
5225e788 | 244 | |
6eb42155 | 245 | return mp->nmds; |
5225e788 | 246 | } |