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 + 1)
27
28 struct hist_bkt {
29 __u32 dev;
30 int hist[NBKTS * sizeof(int)];
31 };
32
unplug_hist_alloc(__u32 device)33 void *unplug_hist_alloc(__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
unplug_hist_add(struct io * u_iop)46 void unplug_hist_add(struct io *u_iop)
47 {
48 struct d_info *dip;
49
50 dip = __dip_find(u_iop->t.device);
51 if (dip && dip->up_hist_handle) {
52 __u64 *val = u_iop->pdu;
53 int idx, n_unplugs = be64_to_cpu(*val);
54 struct hist_bkt *hbp = dip->up_hist_handle;
55
56 idx = (n_unplugs / BKT_WIDTH);
57 if (idx > EXCESS_BKT)
58 idx = EXCESS_BKT;
59
60 hbp->hist[idx]++;
61 }
62 }
63
unplug_hist_free(void * arg)64 void unplug_hist_free(void *arg)
65 {
66 if (arg) {
67 FILE *fp;
68 struct hist_bkt *hbp = arg;
69 int mjr = hbp->dev >> MINORBITS;
70 int mnr = hbp->dev & ((1 << MINORBITS) - 1);
71 char *oname = malloc(strlen(unplug_hist_name) + 32);
72
73 sprintf(oname, "%s_%03d,%03d.dat", unplug_hist_name, mjr, mnr);
74 if ((fp = my_fopen(oname, "w")) != NULL) {
75 int i;
76
77 for (i = 0; i < NBKTS; i++)
78 fprintf(fp, "%d %d\n", i, hbp->hist[i]);
79 fclose(fp);
80
81 } else
82 perror(oname);
83
84 free(oname);
85 free(hbp);
86 }
87 }
88