Ajay Mohan / Rasperf

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Commit 8eef3f5dcb05c7322a51ffe1f523ee1fd46e617d

Authored by Aravind Kumar
1 parent a6ea1595c9
Exists in master

getpid syscall

Showing 7 changed files with 55 additions and 7 deletions Side-by-side Diff

cpu/getpid.c View file @ 8eef3f5
  1 +#define _GNU_SOURCE
  2 +#include <unistd.h>
  3 +#include <sys/syscall.h>
  4 +#include <sys/types.h>
  5 +#include <signal.h>
  6 +#include <sys/time.h>
  7 +#include <stdio.h>
  8 +
  9 +int main(int argc, char *argv[])
  10 +{
  11 + pid_t tid;
  12 + int i = 0;
  13 + float avg_read_time = 0;
  14 + struct timeval tv1, tv2;
  15 + float avg_syscall_time = 0;
  16 + unsigned int dummy;
  17 +
  18 + for (i = 0; i < 1000; i++) {
  19 + gettimeofday(&tv1, NULL);
  20 + gettimeofday(&tv2, NULL);
  21 + avg_read_time += (tv2.tv_sec*1e6 + tv2.tv_usec - tv1.tv_sec*1e6 - tv1.tv_usec);
  22 + }
  23 +
  24 + printf("avg_read_time: %f\n", avg_read_time/1000.0);
  25 +
  26 + for (i = 0; i < 100; i++) {
  27 + gettimeofday(&tv1, NULL);
  28 + syscall(SYS_tgkill, getpid(), tid, SIGHUP);
  29 + gettimeofday(&tv2, NULL);
  30 + dummy += (tv2.tv_sec*1e6 + tv2.tv_usec - tv1.tv_sec*1e6 - tv1.tv_usec);
  31 + avg_syscall_time += dummy;
  32 + printf("avg_syscall_time: %u\n", dummy);
  33 + avg_syscall_time -= avg_read_time;
  34 + }
  35 + printf("avg_syscall_time: %f\n", avg_syscall_time/100.0);
  36 + return 0;
  37 +}
cpu/loop_overhead_time.c View file @ 8eef3f5
... ... @@ -12,7 +12,7 @@
12 12 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (time1));
13 13 for (i = 0; i < 1000; i++);
14 14 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (time2));
15   - avg = (time2 - time1 - 5); //5 is measurement overhead for mrc
  15 + avg = (time2 - time1 - 5)/1000; //5 is measurement overhead for mrc
16 16 sum++;
17 17 }
18 18 printf("%f", avg/100);
cpu/loop_overhead_time.o View file @ 8eef3f5

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cpu/reading_time.c View file @ 8eef3f5
... ... @@ -9,13 +9,13 @@
9 9 asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (time));
10 10  
11 11 time = 0;
12   - for (i = 0; i < 1000; i++) {
  12 + for (i = 0; i < 10000; i++) {
13 13 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (a));
14 14 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (b));
15 15 time += b - a;
16 16 //printf("%d,", b-a);
17 17 }
18   - avg = time / 1000;
  18 + avg = time / 10000;
19 19 printf("Measurement overhead: %f\n", avg);
20 20 return 0;
21 21 }
cpu/reading_time.o View file @ 8eef3f5

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cpu/syscall.c View file @ 8eef3f5
1 1 #include <stdio.h>
  2 +#include <sys/syscall.h>
  3 +#include <sys/types.h>
  4 +#include <unistd.h>
  5 +#include <stdio.h>
  6 +#include <assert.h>
2 7  
3 8 int main()
4 9 {
5 10 unsigned int regr;
6   - unsigned int i;
7   - unsigned int a, b;
  11 + unsigned int i, i2;
  12 + unsigned int a, b, c;
8 13  
9 14 asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (regr));
10 15 // printf("regr: %x\n", regr);
11 16  
12 17 regr = 0;
  18 + i2 = getpid();
13 19 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (a));
14   - i = getpid();
  20 + //syscall(getpid());
  21 + i = syscall(SYS_getpid);
15 22 asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (b));
16   - printf("PID: %u, Time for getpid: %u\n", i, b - a);
  23 + //getpid();
  24 + i = syscall(SYS_getpid);
  25 + //syscall(getpid());
  26 + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (c));
  27 + printf("PID: %u %u, Time for getpid: %u, %u\n", i, i2, b - a, c - b);
17 28 return 0;
18 29 }
cpu/syscall.o View file @ 8eef3f5

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