If there is information for TSC to nanoseconds conversion in the trace
file metadata, use it to recalculate the timestamps of all events.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
lib/trace-cmd/trace-input.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index e1842cce..266b0b0c 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -1196,6 +1196,23 @@ static void free_next(struct tracecmd_input *handle, int cpu)
tracecmd_free_record(record);
}
+/* This functions was taken from the Linux kernel */
+static unsigned long long mul_u64_u32_shr(unsigned long long a,
+ unsigned long long mul, unsigned int shift)
+{
+ unsigned int ah, al;
+ unsigned long long ret;
+
+ al = a;
+ ah = a >> 32;
+
+ ret = (al * mul) >> shift;
+ if (ah)
+ ret += (ah * mul) << (32 - shift);
+
+ return ret;
+}
+
static inline unsigned long long
timestamp_correction_calc(unsigned long long ts, unsigned int flags,
struct ts_offset_sample *min,
@@ -1283,6 +1300,10 @@ static unsigned long long timestamp_calc(unsigned long long ts,
if (handle->ts2secs)
ts *= handle->ts2secs;
+ else if (handle->tsc_calc.mult) {
+ ts -= handle->tsc_calc.offset;
+ ts = mul_u64_u32_shr(ts, handle->tsc_calc.mult, handle->tsc_calc.shift);
+ }
return ts;
}
--
2.30.2
|