tools/perf/util/rlimit.c

   1 /* SPDX-License-Identifier: LGPL-2.1 */
   2
   3 #include <errno.h>
   4 #include "util/debug.h"
   5 #include "util/rlimit.h"
   6 #include <sys/time.h>
   7 #include <sys/resource.h>
   8
   9 /*
  10  * Bump the memlock so that we can get bpf maps of a reasonable size,
  11  * like the ones used with 'perf trace' and with 'perf test bpf',
  12  * improve this to some specific request if needed.
  13  */
  14 void rlimit__bump_memlock(void)
  15 {
  16         struct rlimit rlim;
  17
  18         if (getrlimit(RLIMIT_MEMLOCK, &rlim) == 0) {
  19                 rlim.rlim_cur *= 4;
  20                 rlim.rlim_max *= 4;
  21
  22                 if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0) {
  23                         rlim.rlim_cur /= 2;
  24                         rlim.rlim_max /= 2;
  25
  26                         if (setrlimit(RLIMIT_MEMLOCK, &rlim) < 0)
  27                                 pr_debug("Couldn't bump rlimit(MEMLOCK), failures may take place when creating BPF maps, etc\n");
  28                 }
  29         }
  30 }
  31
  32 bool rlimit__increase_nofile(enum rlimit_action *set_rlimit)
  33 {
  34         int old_errno;
  35         struct rlimit l;
  36
  37         if (*set_rlimit < INCREASED_MAX) {
  38                 old_errno = errno;
  39
  40                 if (getrlimit(RLIMIT_NOFILE, &l) == 0) {
  41                         if (*set_rlimit == NO_CHANGE) {
  42                                 l.rlim_cur = l.rlim_max;
  43                         } else {
  44                                 l.rlim_cur = l.rlim_max + 1000;
  45                                 l.rlim_max = l.rlim_cur;
  46                         }
  47                         if (setrlimit(RLIMIT_NOFILE, &l) == 0) {
  48                                 (*set_rlimit) += 1;
  49                                 errno = old_errno;
  50                                 return true;
  51                         }
  52                 }
  53                 errno = old_errno;
  54         }
  55
  56         return false;
  57 }