/*
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* blktrace output analysis: generate a timeline & gather statistics
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*
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* Copyright (C) 2006 Alan D. Brunelle <Alan.Brunelle@hp.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include "globals.h"
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#define BKT_WIDTH 5
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#define MAX_BKT 19
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#define EXCESS_BKT 20
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#define NBKTS (EXCESS_BKT + 1)
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struct hist_bkt {
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struct d_info *dip;
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int hist[NBKTS * sizeof(int)];
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};
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void *unplug_hist_alloc(struct d_info *dip)
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{
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struct hist_bkt *hbp;
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if (unplug_hist_name == NULL)
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return NULL;
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hbp = calloc(1, sizeof(*hbp));
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hbp->dip = dip;
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return hbp;
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}
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void unplug_hist_add(struct io *u_iop)
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{
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struct d_info *dip;
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dip = __dip_find(u_iop->t.device);
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if (dip && dip->up_hist_handle) {
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__u64 *val = u_iop->pdu;
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int idx, n_unplugs = be64_to_cpu(*val);
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struct hist_bkt *hbp = dip->up_hist_handle;
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idx = (n_unplugs / BKT_WIDTH);
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if (idx > EXCESS_BKT)
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idx = EXCESS_BKT;
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hbp->hist[idx]++;
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}
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}
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void unplug_hist_free(void *arg)
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{
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if (arg) {
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FILE *fp;
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struct hist_bkt *hbp = arg;
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size_t tlen = strlen(unplug_hist_name)
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+ strlen(hbp->dip->dip_name) + 32;
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char *oname = malloc(tlen);
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sprintf(oname, "%s_%s.dat", unplug_hist_name,
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hbp->dip->dip_name);
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if ((fp = my_fopen(oname, "w")) != NULL) {
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int i;
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for (i = 0; i < NBKTS; i++)
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fprintf(fp, "%d %d\n", i, hbp->hist[i]);
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fclose(fp);
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} else
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perror(oname);
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free(oname);
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free(hbp);
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}
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}
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