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fc16a815 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 | ||
23 | #define BKT_WIDTH 5 | |
24 | #define MAX_BKT 19 | |
25 | #define EXCESS_BKT 20 | |
26 | #define NBKTS EXCESS_BKT | |
27 | ||
28 | struct hist_bkt { | |
29 | __u32 dev; | |
30 | int hist[NBKTS * sizeof(int)]; | |
31 | }; | |
32 | ||
fc16a815 AB |
33 | void *unplug_hist_init(__u32 device) |
34 | { | |
35 | struct hist_bkt *hbp; | |
36 | ||
37 | if (unplug_hist_name == NULL) return NULL; | |
38 | ||
39 | hbp = malloc(sizeof(*hbp)); | |
40 | hbp->dev = device; | |
41 | memset(hbp->hist, 0, NBKTS * sizeof(int)); | |
42 | ||
43 | return hbp; | |
44 | } | |
45 | ||
46 | void unplug_hist_add(struct io *u_iop) | |
47 | { | |
48 | struct d_info *dip; | |
49 | ||
50 | assert(u_iop->t.pdu_len >= sizeof(__u64)); | |
51 | ||
52 | dip = __dip_find(u_iop->t.device); | |
53 | if (dip && dip->unplug_hist_handle) { | |
54 | __u64 *val = u_iop->pdu; | |
5406b971 AB |
55 | int idx, n_unplugs = be64_to_cpu(*val); |
56 | struct hist_bkt *hbp = dip->unplug_hist_handle; | |
57 | ||
58 | idx = (n_unplugs / BKT_WIDTH); | |
59 | if (idx > MAX_BKT) | |
60 | idx = EXCESS_BKT; | |
fc16a815 AB |
61 | |
62 | assert((0 <= idx) && (idx <= EXCESS_BKT)); | |
63 | hbp->hist[idx]++; | |
64 | } | |
65 | } | |
66 | ||
67 | void unplug_hist_exit(void *arg) | |
68 | { | |
69 | if (arg) { | |
70 | FILE *fp; | |
71 | struct hist_bkt *hbp = arg; | |
72 | int mjr = hbp->dev >> MINORBITS; | |
73 | int mnr = hbp->dev & ((1 << MINORBITS) - 1); | |
74 | char *oname = malloc(strlen(unplug_hist_name) + 32); | |
75 | ||
76 | sprintf(oname, "%s_%03d,%03d.dat", unplug_hist_name, mjr, mnr); | |
77 | if ((fp = fopen(oname, "w")) != NULL) { | |
78 | int i; | |
79 | ||
80 | for (i = 0; i < NBKTS; i++) | |
81 | fprintf(fp, "%d %d\n", i, hbp->hist[i]); | |
82 | fclose(fp); | |
83 | ||
84 | } | |
85 | else | |
86 | perror(oname); | |
87 | ||
88 | free(oname); | |
89 | free(hbp); | |
90 | } | |
91 | } |