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PerformanceManager.h
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/*
* Copyright (c) 2021, Brian Gianforcaro <[email protected]>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/PerformanceEventBuffer.h>
#include <Kernel/Process.h>
#include <Kernel/Thread.h>
namespace Kernel {
class PerformanceManager {
public:
inline static void add_process_created_event(Process& process)
{
if (g_profiling_all_threads) {
VERIFY(g_global_perf_events);
(void)g_global_perf_events->add_process(process, ProcessEventType::Create);
}
}
inline static void add_process_exec_event(Process& process)
{
if (auto* event_buffer = process.current_perf_events_buffer()) {
(void)event_buffer->add_process(process, ProcessEventType::Exec);
}
}
inline static void add_process_exit_event(Process& process)
{
if (g_profiling_all_threads) {
VERIFY(g_global_perf_events);
[[maybe_unused]] auto rc = g_global_perf_events->append_with_ip_and_bp(
process.pid(), 0, 0, 0, PERF_EVENT_PROCESS_EXIT, 0, 0, 0, {});
}
}
inline static void add_thread_created_event(Thread& thread)
{
if (thread.is_profiling_suppressed())
return;
if (auto* event_buffer = thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append(PERF_EVENT_THREAD_CREATE, thread.tid().value(), 0, {}, &thread);
}
}
inline static void add_thread_exit_event(Thread& thread)
{
// As an exception this doesn't check whether profiling is suppressed for
// the thread so we can record the thread_exit event anyway.
if (auto* event_buffer = thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append(PERF_EVENT_THREAD_EXIT, thread.tid().value(), 0, {}, &thread);
}
}
inline static void add_cpu_sample_event(Thread& current_thread, RegisterState const& regs, u32 lost_time)
{
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append_with_ip_and_bp(
current_thread.pid(), current_thread.tid(), regs, PERF_EVENT_SAMPLE, lost_time, 0, 0, {});
}
}
inline static void add_mmap_perf_event(Process& current_process, Memory::Region const& region)
{
if (auto* event_buffer = current_process.current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_MMAP, region.vaddr().get(), region.size(), region.name());
}
}
inline static void add_unmap_perf_event(Process& current_process, Memory::VirtualRange const& region)
{
if (auto* event_buffer = current_process.current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_MUNMAP, region.base().get(), region.size(), {});
}
}
inline static void add_context_switch_perf_event(Thread& current_thread, Thread& next_thread)
{
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_CONTEXT_SWITCH, next_thread.pid().value(), next_thread.tid().value(), {});
}
}
inline static void add_kmalloc_perf_event(Thread& current_thread, size_t size, FlatPtr ptr)
{
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_KMALLOC, size, ptr, {});
}
}
inline static void add_kfree_perf_event(Thread& current_thread, size_t size, FlatPtr ptr)
{
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_KFREE, size, ptr, {});
}
}
inline static void add_page_fault_event(Thread& thread, RegisterState const& regs)
{
if (thread.is_profiling_suppressed())
return;
if (auto* event_buffer = thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append_with_ip_and_bp(
thread.pid(), thread.tid(), regs, PERF_EVENT_PAGE_FAULT, 0, 0, 0, {});
}
}
inline static void add_syscall_event(Thread& thread, RegisterState const& regs)
{
if (thread.is_profiling_suppressed())
return;
if (auto* event_buffer = thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append_with_ip_and_bp(
thread.pid(), thread.tid(), regs, PERF_EVENT_SYSCALL, 0, 0, 0, {});
}
}
inline static void add_read_event(Thread& thread, int fd, size_t size, OpenFileDescription const& file_description, u64 start_timestamp, ErrorOr<FlatPtr> result)
{
if (thread.is_profiling_suppressed())
return;
auto* event_buffer = thread.process().current_perf_events_buffer();
if (event_buffer == nullptr)
return;
size_t filepath_string_index;
if (auto path = file_description.original_absolute_path(); !path.is_error()) {
auto registered_result = event_buffer->register_string(move(path.value()));
if (registered_result.is_error())
return;
filepath_string_index = registered_result.value();
} else if (auto pseudo_path = file_description.pseudo_path(); !pseudo_path.is_error()) {
auto registered_result = event_buffer->register_string(move(pseudo_path.value()));
if (registered_result.is_error())
return;
filepath_string_index = registered_result.value();
} else {
auto invalid_path_string = KString::try_create("<INVALID_FILE_PATH>"sv); // TODO: Performance, unecessary allocations.
if (invalid_path_string.is_error())
return;
auto registered_result = event_buffer->register_string(move(invalid_path_string.value()));
if (registered_result.is_error())
return;
filepath_string_index = registered_result.value();
}
[[maybe_unused]] auto rc = event_buffer->append(PERF_EVENT_READ, fd, size, {}, &thread, filepath_string_index, start_timestamp, result); // wrong arguments
}
inline static void timer_tick(RegisterState const& regs)
{
static Time last_wakeup;
auto now = kgettimeofday();
constexpr auto ideal_interval = Time::from_microseconds(1000'000 / OPTIMAL_PROFILE_TICKS_PER_SECOND_RATE);
auto expected_wakeup = last_wakeup + ideal_interval;
auto delay = (now > expected_wakeup) ? now - expected_wakeup : Time::from_microseconds(0);
last_wakeup = now;
auto* current_thread = Thread::current();
// FIXME: We currently don't collect samples while idle.
// That will be an interesting mode to add in the future. :^)
if (!current_thread || current_thread == Processor::idle_thread())
return;
auto lost_samples = delay.to_microseconds() / ideal_interval.to_microseconds();
PerformanceManager::add_cpu_sample_event(*current_thread, regs, lost_samples);
}
};
}