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Merge pull request #281 from pmj/performance-tracing
Mac: a performance tracing mechanism for the kext
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| #include "PerformanceTracing.hpp" | ||
| #include <sys/types.h> | ||
| #include <stdatomic.h> | ||
| #include <IOKit/IOUserClient.h> | ||
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| PerfTracingProbe profile_probes[Probe_Count]; | ||
|
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| void PerfTracing_Init() | ||
| { | ||
| for (size_t i = 0; i < Probe_Count; ++i) | ||
| { | ||
| PerfTracing_ProbeInit(&profile_probes[i]); | ||
| } | ||
| } | ||
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| void PerfTracing_ProbeInit(PerfTracingProbe* probe) | ||
| { | ||
| *probe = PerfTracingProbe{ .min = UINT64_MAX }; | ||
| } | ||
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| IOReturn PerfTracing_ExportDataUserClient(IOExternalMethodArguments* arguments) | ||
| { | ||
| #if PRJFS_PERFORMANCE_TRACING_ENABLE | ||
| if (arguments->structureOutput == nullptr || arguments->structureOutputSize != sizeof(profile_probes)) | ||
| { | ||
| return kIOReturnBadArgument; | ||
| } | ||
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| memcpy(arguments->structureOutput, profile_probes, sizeof(profile_probes)); | ||
| return kIOReturnSuccess; | ||
| #else | ||
| return kIOReturnUnsupported; | ||
| #endif | ||
| } | ||
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| void PerfTracing_RecordSample(PerfTracingProbe* probe, uint64_t startTime, uint64_t endTime) | ||
| { | ||
| uint64_t interval = endTime - startTime; | ||
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| atomic_fetch_add(&probe->numSamples1, 1); | ||
| atomic_fetch_add(&probe->sum, interval); | ||
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| __uint128_t intervalSquared = interval; | ||
| intervalSquared *= intervalSquared; | ||
| atomic_fetch_add(&probe->sumSquares, intervalSquared); | ||
|
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||
| // Update minimum sample if necessary | ||
| { | ||
| uint64_t oldMin = atomic_load(&probe->min); | ||
| while (interval < oldMin && !atomic_compare_exchange_weak(&probe->min, &oldMin, interval)) | ||
| {} | ||
| } | ||
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| // Update maximum sample if necessary | ||
| { | ||
| uint64_t oldMax = atomic_load(&probe->max); | ||
| while (interval > oldMax && !atomic_compare_exchange_weak(&probe->max, &oldMax, interval)) | ||
| {} | ||
| } | ||
|
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| atomic_fetch_add(&probe->numSamples2, 1); | ||
| } | ||
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