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Member "stress-ng-0.09.56/core-mmap.c" (15 Mar 2019, 1825 Bytes) of package /linux/privat/stress-ng-0.09.56.tar.xz:


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    1 /*
    2  * Copyright (C) 2017-2019 Canonical, Ltd.
    3  *
    4  * This program is free software; you can redistribute it and/or
    5  * modify it under the terms of the GNU General Public License
    6  * as published by the Free Software Foundation; either version 2
    7  * of the License, or (at your option) any later version.
    8  *
    9  * This program is distributed in the hope that it will be useful,
   10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12  * GNU General Public License for more details.
   13  *
   14  * You should have received a copy of the GNU General Public License
   15  * along with this program; if not, write to the Free Software
   16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
   17  *
   18  * This code is a complete clean re-write of the stress tool by
   19  * Colin Ian King <colin.king@canonical.com> and attempts to be
   20  * backwardly compatible with the stress tool by Amos Waterland
   21  * <apw@rossby.metr.ou.edu> but has more stress tests and more
   22  * functionality.
   23  *
   24  */
   25 #include "stress-ng.h"
   26 
   27 /*
   28  *  mmap_set()
   29  *  set mmap'd data, touching pages in
   30  *  a specific pattern - check with
   31  *  mmap_check().
   32  */
   33 void mmap_set(
   34     uint8_t *buf,
   35     const size_t sz,
   36     const size_t page_size)
   37 {
   38     size_t i, j;
   39     uint8_t val = 0;
   40     uint8_t *ptr = buf;
   41 
   42     for (i = 0; i < sz; i += page_size) {
   43         if (!g_keep_stressing_flag)
   44             break;
   45         for (j = 0; j < page_size; j++)
   46             *ptr++ = val++;
   47         val++;
   48     }
   49 }
   50 
   51 /*
   52  *  mmap_check()
   53  *  check if mmap'd data is sane
   54  */
   55 int mmap_check(
   56     uint8_t *buf,
   57     const size_t sz,
   58     const size_t page_size)
   59 {
   60     size_t i, j;
   61     uint8_t val = 0;
   62     uint8_t *ptr = buf;
   63 
   64     for (i = 0; i < sz; i += page_size) {
   65         if (!g_keep_stressing_flag)
   66             break;
   67         for (j = 0; j < page_size; j++)
   68             if (*ptr++ != val++)
   69                 return -1;
   70         val++;
   71     }
   72     return 0;
   73 }