76 lines
2.1 KiB
C
76 lines
2.1 KiB
C
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/* Copyright (C) 2021 Free Software Foundation, Inc.
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Contributed by Oracle.
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This file is part of GNU Binutils.
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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 3, or (at your option)
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any later version.
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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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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, 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include "stopwatch.h"
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/*=======================================================*/
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/* pagethrash - allocate some memory, and thrash around in it */
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int
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pagethrash (int thrashmb)
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{
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char buf[1024];
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hrtime_t start = gethrtime ();
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hrtime_t vstart = gethrvtime ();
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/* Log the event */
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wlog ("start of pagethrash", NULL);
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/* Start a stopwatch */
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stopwatch_t *w = stpwtch_alloc ("pagethrash", 0);
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/* compute the size */
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unsigned long size = thrashmb * 1024 * 1024;
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int pagesize = getpagesize ();
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void *space = malloc (size + pagesize);
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if (space == NULL)
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{
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fprintf (stderr, "\tpagethrash failed; can't get %ld bytes.\n", size);
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exit (1);
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}
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/* round address to page boundary */
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unsigned long loc = (((unsigned long) space + pagesize - 1) & ~(pagesize - 1));
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long npages = size / pagesize;
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/* touch all the pages to force them in */
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for (long i = 0; i < npages; i++)
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{
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stpwtch_start (w);
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*(int *) (loc + i * pagesize) = i;
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stpwtch_stop (w);
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}
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/* now free up the space */
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free (space);
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/* print the timing results */
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stpwtch_print (w);
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free ((void *) w);
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sprintf (buf, "pagethrash: %ld pages", npages);
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whrvlog (gethrtime () - start, gethrvtime () - vstart, buf, NULL);
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return 0;
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}
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