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Kernel/Profiling: Add profiling to read syscall

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Syscalls to read can now be profiled, allowing us to monitor
filesystem usage by different applications.
This commit is contained in:
Jakub Berkop 2021-12-04 13:26:13 +01:00 • committed by Andreas Kling
parent bd821982e0
commit 4916c892b2
6 changed files with 86 additions and 9 deletions
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34
Kernel/PerformanceManager.h
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@ -127,6 +127,40 @@ public:
}
}
inline static void add_read_event(Thread& thread, int fd, size_t size, const OpenFileDescription& 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>"); // 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, 0, &thread, filepath_string_index, start_timestamp, result); // wrong arguments
}
inline static void timer_tick(RegisterState const& regs)
{
static Time last_wakeup;