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
23static void __add_trace(struct io *iop)
24{
25	time_t now = time(NULL);
26
27	n_traces++;
28	iostat_check_time(iop->t.time);
29
30	if (verbose && ((now - last_vtrace) > 0)) {
31		printf("%10lu t (%6.2lf%%)\r", n_traces, pct_done());
32		if ((n_traces % 1000000) == 0) printf("\n");
33		fflush(stdout);
34		last_vtrace = now;
35	}
36
37	switch (iop->t.action & 0xffff) {
38	case __BLK_TA_QUEUE:		trace_queue(iop); break;
39	case __BLK_TA_REMAP:		trace_remap(iop); break;
40	case __BLK_TA_INSERT:		trace_insert(iop); break;
41	case __BLK_TA_GETRQ:		trace_getrq(iop); break;
42	case __BLK_TA_BACKMERGE:	trace_merge(iop); break;
43	case __BLK_TA_FRONTMERGE:	trace_merge(iop); break;
44	case __BLK_TA_REQUEUE:		trace_requeue(iop); break;
45	case __BLK_TA_ISSUE:		trace_issue(iop); break;
46	case __BLK_TA_COMPLETE:		trace_complete(iop); break;
47	case __BLK_TA_PLUG:		trace_plug(iop); break;
48	case __BLK_TA_UNPLUG_IO:	trace_unplug_io(iop); break;
49	case __BLK_TA_UNPLUG_TIMER:	trace_unplug_timer(iop); break;
50	case __BLK_TA_SLEEPRQ:		trace_sleeprq(iop); break;
51	default:
52		io_release(iop);
53		return;
54	}
55}
56
57static void trace_message(struct io *iop)
58{
59	char scratch[15];
60	char msg[iop->t.pdu_len + 1];
61
62	if (!io_setup(iop, IOP_M))
63		return;
64
65	memcpy(msg, iop->pdu, iop->t.pdu_len);
66	msg[iop->t.pdu_len] = '\0';
67
68	fprintf(msgs_ofp, "%s %5d.%09lu %s\n",
69		make_dev_hdr(scratch, 15, iop->dip, 1),
70		(int)SECONDS(iop->t.time),
71		(unsigned long)NANO_SECONDS(iop->t.time), msg);
72}
73
74void add_trace(struct io *iop)
75{
76	if (iop->t.action & BLK_TC_ACT(BLK_TC_NOTIFY)) {
77		if (iop->t.action == BLK_TN_PROCESS) {
78			if (iop->t.pid == 0)
79				process_alloc(0, "kernel");
80			else {
81				char *slash = strchr(iop->pdu, '/');
82				if (slash)
83					*slash = '\0';
84
85				process_alloc(iop->t.pid, iop->pdu);
86			}
87		} else if (iop->t.action == BLK_TN_MESSAGE)
88			trace_message(iop);
89		io_release(iop);
90	} else if (iop->t.action & BLK_TC_ACT(BLK_TC_PC)) {
91		io_release(iop);
92	} else {
93		if (time_bounded) {
94			if (BIT_TIME(iop->t.time) < t_astart) {
95				io_release(iop);
96				return;
97			} else if (BIT_TIME(iop->t.time) > t_aend) {
98				io_release(iop);
99				done = 1;
100				return;
101			}
102		}
103		__add_trace(iop);
104	}
105}
106