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05515f1759
This uses sched_getcpu(2) to find the CPU we are scheduled on and then cpufreq(4) to find the frequency of that CPU. The caller is responsible for pinning the thread to one CPU and/or disabling frequency scaling if a consistent result is required.
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
--- cpucycles/wrapper.c.orig 2024-03-18 00:15:33 UTC
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+++ cpucycles/wrapper.c
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@@ -16,6 +16,12 @@
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#include <inttypes.h>
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#include <signal.h>
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#include <setjmp.h>
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+
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+#ifdef __FreeBSD__
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+#include <sched.h>
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+#include <sys/sysctl.h>
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+#endif
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+
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#include "cpucycles.h"
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#include "cpucycles_internal.h"
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@@ -26,7 +32,7 @@ void cpucycles_tracesetup(void)
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tracesetup = 1;
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}
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-static jmp_buf crash_jmp;
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+static sigjmp_buf crash_jmp;
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static void crash(int s)
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{
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@@ -81,6 +87,21 @@ static double osfreq(void)
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if (s > 0) return result;
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}
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+#ifdef __FreeBSD__
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+ {
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+ int freq;
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+ size_t len = sizeof freq;
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+ char *freqctl;
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+
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+ if (asprintf(&freqctl, "dev.cpu.%d.freq", sched_getcpu())) {
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+ if (sysctlbyname(freqctl, &freq, &len, NULL, 0) == 0) {
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+ free(freqctl);
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+ return 1e6 * freq;
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+ } else
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+ free(freqctl);
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+ }
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+ }
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+#else
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f = fopen("/sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed", "r");
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if (f) {
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s = fscanf(f,"%lf",&result);
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@@ -163,6 +184,7 @@ static double osfreq(void)
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pclose(f);
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if (result) return 1000000.0 * result;
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}
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+#endif /* defined(__FreeBSD__) */
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x = getenv("cpucyclespersecond");
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if (x) {
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