mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-07 17:00:19 +02:00
Ryan Houdek
3e48b1a8ac
This creates a generic interface that FEXCore can use for timeline profiling. This allows us to create a generic interface which the backend details are hidden so we can support multiple timeline profile APIs. The only API supported right now is ftrace/gpuvis. Which is extremely lightweight of an interface with minimal overhead. We must be careful here since in most cases will will have dozens of FEX instances running at any given time. So a timeline profiler like Microprofiler can have major issues since that only ever expects a single process at a time. Not enabled by default but just needs the `ENABLE_FEXCORE_PROFILER` cmake option set to enable.
117 lines
2.7 KiB
C++
117 lines
2.7 KiB
C++
#include <array>
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#include <cstdint>
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#include <fcntl.h>
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#include <limits.h>
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#include <linux/magic.h>
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#include <string>
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#include <sys/stat.h>
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#include <sys/vfs.h>
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#include <FEXCore/Utils/LogManager.h>
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#include <FEXCore/Utils/Profiler.h>
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#define BACKEND_OFF 0
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#define BACKEND_GPUVIS 1
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#ifdef ENABLE_FEXCORE_PROFILER
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#if FEXCORE_PROFILER_BACKEND == BACKEND_GPUVIS
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namespace FEXCore::Profiler {
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ProfilerBlock::ProfilerBlock(std::string_view const Format)
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: DurationBegin {GetTime()}
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, Format {Format} {
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}
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ProfilerBlock::~ProfilerBlock() {
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auto Duration = GetTime() - DurationBegin;
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TraceObject(Format, Duration);
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}
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}
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namespace GPUVis {
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// ftrace FD for writing trace data.
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// Needs to be a raw FD since we hold this open for the entire application execution.
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static int TraceFD {-1};
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// Need to search the paths to find the real trace path
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static std::array<char const*, 2> TraceFSDirectories {
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"/sys/kernel/tracing",
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"/sys/kernel/debug/tracing",
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};
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static bool IsTraceFS(char const* Path) {
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struct statfs stat;
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if (statfs(Path, &stat)) {
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return false;
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}
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return stat.f_type == TRACEFS_MAGIC;
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}
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void Init() {
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for (auto Path : TraceFSDirectories) {
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if (IsTraceFS(Path)) {
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std::string FilePath = fmt::format("{}/trace_marker", Path);
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TraceFD = open(FilePath.c_str(), O_WRONLY | O_CLOEXEC);
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if (TraceFD != -1) {
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// Opened TraceFD, early exit
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break;
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}
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}
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}
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}
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void Shutdown() {
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if (TraceFD != -1) {
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close(TraceFD);
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TraceFD = -1;
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}
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}
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void TraceObject(std::string_view const Format, uint64_t Duration) {
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if (TraceFD != -1) {
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// Print the duration as something that began negative duration ago
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std::string Event = fmt::format("{} (lduration=-{})\n", Format, Duration);
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write(TraceFD, Event.c_str(), Event.size());
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}
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}
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void TraceObject(std::string_view const Format) {
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if (TraceFD != -1) {
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std::string Event = fmt::format("{}\n", Format);
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write(TraceFD, Format.data(), Format.size());
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}
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}
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}
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#else
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#error Unknown profiler backend
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#endif
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#endif
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namespace FEXCore::Profiler {
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#ifdef ENABLE_FEXCORE_PROFILER
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void Init() {
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#if FEXCORE_PROFILER_BACKEND == BACKEND_GPUVIS
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GPUVis::Init();
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#endif
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}
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void Shutdown() {
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#if FEXCORE_PROFILER_BACKEND == BACKEND_GPUVIS
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GPUVis::Shutdown();
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#endif
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}
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void TraceObject(std::string_view const Format, uint64_t Duration) {
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#if FEXCORE_PROFILER_BACKEND == BACKEND_GPUVIS
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GPUVis::TraceObject(Format, Duration);
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#endif
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}
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void TraceObject(std::string_view const Format) {
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#if FEXCORE_PROFILER_BACKEND == BACKEND_GPUVIS
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GPUVis::TraceObject(Format);
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#endif
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}
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#endif
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}
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