l4/pkg/plr/ex/eventbuf/main.cc

   1 #include <cstdlib>
   2 #include <cstdio>
   3 #include <cstring>
   4
   5 #include <l4/util/rdtsc.h>
   6 #include <l4/util/util.h>
   7
   8 #include <l4/plr/uu.h>
   9 #include <l4/plr/measurements.h>
  10
  11 Measurements::EventBuf eb;
  12
  13 unsigned char buffer[1024 * 1024];
  14
  15 int main()
  16 {
  17         printf("EB\n");
  18         eb.set_buffer(buffer, sizeof(buffer));
  19         printf("EB.buf = %p, size %d, index %d\n",
  20                eb.buffer, eb.size, eb.index);
  21
  22         printf("Generating 200 events...\n");
  23         for (unsigned i = 0; i < 100; ++i) {
  24
  25                 Measurements::GenericEvent* ev = eb.next();
  26                 ev->header.tsc   = l4_rdtsc();
  27                 ev->header.vcpu  = 0x1234;
  28                 ev->header.type  = Measurements::Foo;
  29                 ev->data.foo.start = 1;
  30                 printf("%d %llx\n", ev->header.type, ev->header.tsc);
  31
  32                 l4_sleep(random() % 100);
  33
  34                 ev = eb.next();
  35                 ev->header.tsc   = l4_rdtsc();
  36                 ev->header.vcpu  = 0x1234;
  37                 ev->header.type  = Measurements::Foo;
  38                 ev->data.foo.start = 0;
  39         }
  40
  41         printf("EB.buf = %p, size %d, index %d\n",
  42                eb.buffer, eb.size, eb.index);
  43         printf("EB.oldest = %d\n", eb.oldest());
  44
  45         char const *filename = "sampledump.txt";
  46
  47         unsigned oldest = eb.oldest();
  48         unsigned dump_start, dump_size;
  49
  50         if (oldest == 0) { // half-full -> dump from 0 to index
  51                 dump_start = 0;
  52                 dump_size  = eb.index * sizeof(Measurements::GenericEvent);
  53         } else { // buffer completely full -> dump full size starting from oldest entry
  54                 dump_start = oldest * sizeof(Measurements::GenericEvent);
  55                 dump_size  = eb.size * sizeof(Measurements::GenericEvent);
  56         }
  57
  58         uu_dumpz_ringbuffer(filename, eb.buffer, eb.size * sizeof(Measurements::GenericEvent),
  59                             dump_start, dump_size);
  60         return 0;
  61 }