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Use TSC instead of steady_clock. This saves RPC cost.

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This commit is contained in:
Michael Mueller
2023-03-27 16:28:14 +02:00
parent bfc90d4dcf
commit 54974c48be
2 changed files with 21 additions and 12 deletions
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8
src/mx/tasking/profiling/profiling_task.cpp
View File

@@ -53,7 +53,8 @@ void Profiler::profile(const std::string &profiling_output_file)
this->_tasks.clear();
this->_profiling_output_file.emplace(profiling_output_file);
this->_start = std::chrono::steady_clock::now();
this->_start = Genode::Trace::timestamp();
//::chrono::steady_clock::now();
}
void Profiler::profile(util::maybe_atomic<bool> &is_running, Channel &channel)
@@ -68,9 +69,8 @@ void Profiler::profile(util::maybe_atomic<bool> &is_running, Channel &channel)
void Profiler::stop()
{
const auto end = std::chrono::steady_clock::now();
const auto end_relative_nanoseconds =
std::chrono::duration_cast<std::chrono::nanoseconds>(end - this->_start).count();
const auto end = Genode::Trace::timestamp(); // std::chrono::steady_clock::now();
const auto end_relative_nanoseconds = (end - this->_start) / 2000000UL; // std::chrono::duration_cast<std::chrono::nanoseconds>(end - this->_start).count();
if (this->_profiling_output_file.has_value())
{
auto output = nlohmann::json{};

25
src/mx/tasking/profiling/profiling_task.h
View File

@@ -7,6 +7,7 @@
#include <optional>
#include <utility>
#include <vector>
#include <base/log.h>
namespace mx::tasking::profiling {
/**
@@ -15,21 +16,22 @@ namespace mx::tasking::profiling {
class IdleRange
{
public:
IdleRange() : _start(std::chrono::steady_clock::now()) {}
IdleRange() : _start(Genode::Trace::timestamp()) {}
IdleRange(IdleRange &&) = default;
~IdleRange() = default;
/**
* Sets the end of the idle range to the current time.
*/
void stop() noexcept { _end = std::chrono::steady_clock::now(); }
void stop() noexcept { _end = Genode::Trace::timestamp(); }
/**
* @return Number of nanoseconds idled.
*/
[[nodiscard]] std::uint64_t nanoseconds() const noexcept
{
return std::chrono::duration_cast<std::chrono::nanoseconds>(_end - _start).count();
return (_end - _start) / 2000000UL; // TODO: Get TSC frequency from Genode
// return std::chrono::duration_cast<std::chrono::nanoseconds>(_end - _start).count();
}
/**
@@ -38,20 +40,26 @@ public:
* @return Pair of (start, stop) normalized to the given time point.
*/
[[nodiscard]] std::pair<std::uint64_t, std::uint64_t> normalize(
const std::chrono::steady_clock::time_point global_start) const noexcept
const Genode::Trace::Timestamp global_start) const noexcept
{
return {
/*return {
std::chrono::duration_cast<std::chrono::nanoseconds>(_start - global_start).count(),
std::chrono::duration_cast<std::chrono::nanoseconds>(_end - global_start).count(),
};*/
return {
(_start - global_start) / 2000000UL,
(_end - global_start) / 2000000UL,
};
}
private:
// Start of idling.
std::chrono::steady_clock::time_point _start;
//std::chrono::steady_clock::time_point _start;
Genode::Trace::Timestamp _start;
// End of idling.
std::chrono::steady_clock::time_point _end;
//std::chrono::steady_clock::time_point _end;
Genode::Trace::Timestamp _end;
};
/**
@@ -110,7 +118,8 @@ private:
std::optional<std::string> _profiling_output_file{std::nullopt};
// Time point of the runtime start.
std::chrono::steady_clock::time_point _start;
//std::chrono::steady_clock::time_point _start;
Genode::Trace::Timestamp _start;
// List of all idle/profile tasks.
std::vector<ProfilingTask *> _tasks;