diff options
Diffstat (limited to 'lib/xray/xray_inmemory_log.cc')
| -rw-r--r-- | lib/xray/xray_inmemory_log.cc | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/lib/xray/xray_inmemory_log.cc b/lib/xray/xray_inmemory_log.cc index cdaa6d1b5c86..83aecfaf7700 100644 --- a/lib/xray/xray_inmemory_log.cc +++ b/lib/xray/xray_inmemory_log.cc @@ -79,15 +79,19 @@ static int __xray_OpenLogFile() XRAY_NEVER_INSTRUMENT { int F = getLogFD(); if (F == -1) return -1; + + // Test for required CPU features and cache the cycle frequency + static bool TSCSupported = probeRequiredCPUFeatures(); + static uint64_t CycleFrequency = TSCSupported ? getTSCFrequency() + : __xray::NanosecondsPerSecond; + // Since we're here, we get to write the header. We set it up so that the // header will only be written once, at the start, and let the threads // logging do writes which just append. XRayFileHeader Header; Header.Version = 1; Header.Type = FileTypes::NAIVE_LOG; - Header.CycleFrequency = probeRequiredCPUFeatures() - ? getTSCFrequency() - : __xray::NanosecondsPerSecond; + Header.CycleFrequency = CycleFrequency; // FIXME: Actually check whether we have 'constant_tsc' and 'nonstop_tsc' // before setting the values in the header. |