tools/perf/tests/workloads/leafloop.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #include <signal.h>
   3 #include <stdlib.h>
   4 #include <linux/compiler.h>
   5 #include <unistd.h>
   6 #include "../tests.h"
   7
   8 /* We want to check these symbols in perf script */
   9 noinline void leaf(volatile int b);
  10 noinline void parent(volatile int b);
  11
  12 static volatile int a;
  13 static volatile sig_atomic_t done;
  14
  15 static void sighandler(int sig __maybe_unused)
  16 {
  17         done = 1;
  18 }
  19
  20 noinline void leaf(volatile int b)
  21 {
  22         while (!done)
  23                 a += b;
  24 }
  25
  26 noinline void parent(volatile int b)
  27 {
  28         leaf(b);
  29 }
  30
  31 static int leafloop(int argc, const char **argv)
  32 {
  33         int sec = 1;
  34
  35         if (argc > 0)
  36                 sec = atoi(argv[0]);
  37
  38         signal(SIGINT, sighandler);
  39         signal(SIGALRM, sighandler);
  40         alarm(sec);
  41
  42         parent(sec);
  43         return 0;
  44 }
  45
  46 DEFINE_WORKLOAD(leafloop);