btt/trace.c

   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 static 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
  57 static 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
  74 void 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                                 add_process(0, "kernel");
  80                         else {
  81                                 char *slash = strchr(iop->pdu, '/');
  82                                 if (slash)
  83                                         *slash = '\0';
  84
  85                                 add_process(iop->t.pid, iop->pdu);
  86                         }
  87                 }
  88                 else if (iop->t.action == BLK_TN_MESSAGE)
  89                         trace_message(iop);
  90                 io_release(iop);
  91         }
  92         else if (iop->t.action & BLK_TC_ACT(BLK_TC_PC))
  93                 io_release(iop);
  94         else {
  95                 if (time_bounded) {
  96                         if (BIT_TIME(iop->t.time) < t_astart) {
  97                                 io_release(iop);
  98                                 return;
  99                         }
 100                         else if (BIT_TIME(iop->t.time) > t_aend) {
 101                                 io_release(iop);
 102                                 done = 1;
 103                                 return;
 104                         }
 105                 }
 106                 __add_trace(iop);
 107         }
 108 }