Release 4.11 tools/perf/arch/x86/util/tsc.c
#include <stdbool.h>
#include <errno.h>
#include <linux/perf_event.h>
#include "../../perf.h"
#include <linux/types.h>
#include "../../util/debug.h"
#include "../../util/tsc.h"
int perf_read_tsc_conversion(const struct perf_event_mmap_page *pc,
struct perf_tsc_conversion *tc)
{
bool cap_user_time_zero;
u32 seq;
int i = 0;
while (1) {
seq = pc->lock;
rmb();
tc->time_mult = pc->time_mult;
tc->time_shift = pc->time_shift;
tc->time_zero = pc->time_zero;
cap_user_time_zero = pc->cap_user_time_zero;
rmb();
if (pc->lock == seq && !(seq & 1))
break;
if (++i > 10000) {
pr_debug("failed to get perf_event_mmap_page lock\n");
return -EINVAL;
}
}
if (!cap_user_time_zero)
return -EOPNOTSUPP;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Adrian Hunter | 117 | 96.69% | 1 | 50.00% |
| Peter Zijlstra | 4 | 3.31% | 1 | 50.00% |
| Total | 121 | 100.00% | 2 | 100.00% |
u64 rdtsc(void)
{
unsigned int low, high;
asm volatile("rdtsc" : "=a" (low), "=d" (high));
return low | ((u64)high) << 32;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Adrian Hunter | 28 | 100.00% | 1 | 100.00% |
| Total | 28 | 100.00% | 1 | 100.00% |
int perf_event__synth_time_conv(const struct perf_event_mmap_page *pc,
struct perf_tool *tool,
perf_event__handler_t process,
struct machine *machine)
{
union perf_event event = {
.time_conv = {
.header = {
.type = PERF_RECORD_TIME_CONV,
.size = sizeof(struct time_conv_event),
},
},
};
struct perf_tsc_conversion tc;
int err;
if (!pc)
return 0;
err = perf_read_tsc_conversion(pc, &tc);
if (err == -EOPNOTSUPP)
return 0;
if (err)
return err;
pr_debug2("Synthesizing TSC conversion information\n");
event.time_conv.time_mult = tc.time_mult;
event.time_conv.time_shift = tc.time_shift;
event.time_conv.time_zero = tc.time_zero;
return process(tool, &event, NULL, machine);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Adrian Hunter | 136 | 94.44% | 1 | 50.00% |
| Wang Nan | 8 | 5.56% | 1 | 50.00% |
| Total | 144 | 100.00% | 2 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Adrian Hunter | 301 | 95.86% | 4 | 57.14% |
| Wang Nan | 8 | 2.55% | 1 | 14.29% |
| Peter Zijlstra | 4 | 1.27% | 1 | 14.29% |
| Borislav Petkov | 1 | 0.32% | 1 | 14.29% |
| Total | 314 | 100.00% | 7 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.