lib/system_specific_hugepages_info.c

   1 /*
   2  *
   3  *   Copyright (c) International Business Machines  Corp., 2009
   4  *
   5  *   This program is free software;  you can redistribute it and/or modify
   6  *   it under the terms of the GNU General Public License as published by
   7  *   the Free Software Foundation; either version 2 of the License, or
   8  *   (at your option) any later version.
   9  *
  10  *   This program is distributed in the hope that it will be useful,
  11  *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13  *   the GNU General Public License for more details.
  14  *
  15  *   You should have received a copy of the GNU General Public License
  16  *   along with this program;  if not, write to the Free Software
  17  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18  */
  19
  20 /*
  21  *   DESCRIPTION
  22  *               get_no_of_hugepages() --> Return No. of hugepages for this systems
  23  *                                         from /proc/meminfo
  24  *               hugepages_size()      --> Return Hugepages Size for this system
  25  *                                         from /proc/meminfo
  26  */
  27
  28 #include <fcntl.h>
  29 #include <sys/types.h>
  30 #include <test.h>
  31
  32 #define BUFSIZE 512
  33
  34 int get_no_of_hugepages() {
  35  #ifdef __linux__
  36        FILE *f;
  37        char buf[BUFSIZ];
  38
  39        f = popen("grep 'HugePages_Total' /proc/meminfo | cut -d ':' -f2 | tr -d ' \n'", "r");
  40        if (!f) {
  41                tst_resm(TBROK, "Could not get info about Total_Hugepages from /proc/meminfo");
  42                tst_exit();
  43        }
  44        if (!fgets(buf, 10, f)) {
  45                fclose(f);
  46                tst_resm(TBROK, "Could not read Total_Hugepages from /proc/meminfo");
  47                tst_exit();
  48        }
  49        pclose(f);
  50        return(atoi(buf));
  51  #else
  52         return -1;
  53  #endif
  54 }
  55
  56
  57 int hugepages_size() {
  58  #ifdef __linux__
  59        FILE *f;
  60        char buf[BUFSIZ];
  61
  62        f = popen("grep 'Hugepagesize' /proc/meminfo | cut -d ':' -f2 | tr -d 'kB \n'", "r");
  63        if (!f) {
  64                tst_resm(TBROK, "Could not get info about HugePages_Size from /proc/meminfo");
  65                tst_exit();
  66        }
  67        if (!fgets(buf, 10, f)) {
  68                fclose(f);
  69                tst_resm(TBROK, "Could not read HugePages_Size from /proc/meminfo");
  70                tst_exit();
  71        }
  72        pclose(f);
  73        return(atoi(buf));
  74  #else
  75         return -1;
  76  #endif
  77 }
  78