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play a bit with the ARM PMU

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Ciro Santilli 六四事件 法轮功
2020-11-18 00:00:00 +00:00
parent 95430c7c0c
commit d4a27987d6
7 changed files with 142 additions and 22 deletions
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15
userland/gcc/busy_loop.c
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@@ -2,18 +2,7 @@
* https://cirosantilli.com/linux-kernel-module-cheat#c-busy-loop
* https://cirosantilli.com/linux-kernel-module-cheat#benchmark-emulators-on-userland-executables */
#include <stdlib.h>
void __attribute__ ((noinline)) busy_loop(
unsigned long long max,
unsigned long long max2
) {
for (unsigned long long i = 0; i < max2; i++) {
for (unsigned long long j = 0; j < max; j++) {
__asm__ __volatile__ ("" : "+g" (i), "+g" (j) : :);
}
}
}
#include <lkmc.h>
int main(int argc, char **argv) {
unsigned long long max, max2;
@@ -27,5 +16,5 @@ int main(int argc, char **argv) {
} else {
max2 = 1;
}
busy_loop(max, max2);
lkmc_busy_loop(max, max2);
}