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Profiler: Use AK::Variant for type-specific data in Profile::Event

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Each event has a different set of data depending on the event type.
This commit is contained in:
Andreas Kling 2021-08-13 21:04:52 +02:00
parent f51f5e135a
commit f5db92448d
Notes: sideshowbarker 2024-07-18 07:00:33 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/f5db92448db
3 changed files with 108 additions and 67 deletions
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98
Userland/DevTools/Profiler/Profile.cpp
View file

@ -76,11 +76,15 @@ void Profile::rebuild_tree()
HashTable<FlatPtr> live_allocations;
for_each_event_in_filter_range([&](auto& event) {
if (event.type == Event::Type::Malloc)
live_allocations.set(event.ptr);
else if (event.type == Event::Type::Free)
live_allocations.remove(event.ptr);
for_each_event_in_filter_range([&](Event const& event) {
event.data.visit(
[&](Event::MallocData const& data) {
live_allocations.set(data.ptr);
},
[&](Event::FreeData const& data) {
live_allocations.remove(data.ptr);
},
[&](auto&) {});
});
m_filtered_event_indices.clear();
@ -99,10 +103,10 @@ void Profile::rebuild_tree()
m_filtered_event_indices.append(event_index);
if (event.type == Event::Type::Malloc && !live_allocations.contains(event.ptr))
if (auto* malloc_data = event.data.get_pointer<Event::MallocData>(); malloc_data && !live_allocations.contains(malloc_data->ptr))
continue;
if (event.type == Event::Type::Free)
if (event.data.has<Event::FreeData>())
continue;
auto for_each_frame = [&]<typename Callback>(Callback callback) {
@ -245,43 +249,55 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
auto type_string = perf_event.get("type").to_string();
if (type_string == "sample"sv) {
event.type = Event::Type::Sample;
event.data = Event::SampleData {};
} else if (type_string == "malloc"sv) {
event.type = Event::Type::Malloc;
event.ptr = perf_event.get("ptr").to_number<FlatPtr>();
event.size = perf_event.get("size").to_number<size_t>();
event.data = Event::MallocData {
.ptr = perf_event.get("ptr"sv).to_number<FlatPtr>(),
.size = perf_event.get("size"sv).to_number<size_t>(),
};
} else if (type_string == "free"sv) {
event.type = Event::Type::Free;
event.ptr = perf_event.get("ptr").to_number<FlatPtr>();
event.data = Event::FreeData {
.ptr = perf_event.get("ptr"sv).to_number<FlatPtr>(),
};
} else if (type_string == "signpost"sv) {
event.type = Event::Type::Signpost;
auto string_id = perf_event.get("arg1").to_number<FlatPtr>();
event.signpost_string = profile_strings.get(string_id).value_or(String::formatted("Signpost #{}", string_id));
event.arg2 = perf_event.get("arg2").to_number<FlatPtr>();
auto string_id = perf_event.get("arg1"sv).to_number<FlatPtr>();
event.data = Event::SignpostData {
.string = profile_strings.get(string_id).value_or(String::formatted("Signpost #{}", string_id)),
.arg = perf_event.get("arg2"sv).to_number<FlatPtr>(),
};
} else if (type_string == "mmap"sv) {
event.type = Event::Type::Mmap;
event.ptr = perf_event.get("ptr").to_number<FlatPtr>();
event.size = perf_event.get("size").to_number<size_t>();
event.name = perf_event.get("name").to_string();
auto ptr = perf_event.get("ptr"sv).to_number<FlatPtr>();
auto size = perf_event.get("size"sv).to_number<size_t>();
auto name = perf_event.get("name"sv).to_string();
event.data = Event::MmapData {
.ptr = ptr,
.size = size,
.name = name,
};
auto it = current_processes.find(event.pid);
if (it != current_processes.end())
it->value->library_metadata.handle_mmap(event.ptr, event.size, event.name);
it->value->library_metadata.handle_mmap(ptr, size, name);
continue;
} else if (type_string == "munmap"sv) {
event.type = Event::Type::Munmap;
event.ptr = perf_event.get("ptr").to_number<FlatPtr>();
event.size = perf_event.get("size").to_number<size_t>();
event.data = Event::MunmapData {
.ptr = perf_event.get("ptr"sv).to_number<FlatPtr>(),
.size = perf_event.get("size"sv).to_number<size_t>(),
};
continue;
} else if (type_string == "process_create"sv) {
event.type = Event::Type::ProcessCreate;
event.parent_pid = perf_event.get("parent_pid").to_number<FlatPtr>();
event.executable = perf_event.get("executable").to_string();
auto parent_pid = perf_event.get("parent_pid"sv).to_number<pid_t>();
auto executable = perf_event.get("executable"sv).to_string();
event.data = Event::ProcessCreateData {
.parent_pid = parent_pid,
.executable = executable,
};
auto sampled_process = adopt_own(*new Process {
.pid = event.pid,
.executable = event.executable,
.basename = LexicalPath::basename(event.executable),
.executable = executable,
.basename = LexicalPath::basename(executable),
.start_valid = event.serial,
.end_valid = {},
});
@ -290,8 +306,10 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
all_processes.append(move(sampled_process));
continue;
} else if (type_string == "process_exec"sv) {
event.type = Event::Type::ProcessExec;
event.executable = perf_event.get("executable").to_string();
auto executable = perf_event.get("executable"sv).to_string();
event.data = Event::ProcessExecData {
.executable = executable,
};
auto old_process = current_processes.get(event.pid).value();
old_process->end_valid = event.serial;
@ -300,8 +318,8 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
auto sampled_process = adopt_own(*new Process {
.pid = event.pid,
.executable = event.executable,
.basename = LexicalPath::basename(event.executable),
.executable = executable,
.basename = LexicalPath::basename(executable),
.start_valid = event.serial,
.end_valid = {},
});
@ -310,21 +328,21 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
all_processes.append(move(sampled_process));
continue;
} else if (type_string == "process_exit"sv) {
event.type = Event::Type::ProcessExit;
auto old_process = current_processes.get(event.pid).value();
old_process->end_valid = event.serial;
current_processes.remove(event.pid);
continue;
} else if (type_string == "thread_create"sv) {
event.type = Event::Type::ThreadCreate;
event.parent_tid = perf_event.get("parent_tid").to_i32();
auto parent_tid = perf_event.get("parent_tid"sv).to_number<pid_t>();
event.data = Event::ThreadCreateData {
.parent_tid = parent_tid,
};
auto it = current_processes.find(event.pid);
if (it != current_processes.end())
it->value->handle_thread_create(event.tid, event.serial);
continue;
} else if (type_string == "thread_exit"sv) {
event.type = Event::Type::ThreadExit;
auto it = current_processes.find(event.pid);
if (it != current_processes.end())
it->value->handle_thread_exit(event.tid, event.serial);
@ -375,7 +393,9 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
FlatPtr innermost_frame_address = event.frames.at(1).address;
event.in_kernel = maybe_kernel_base.has_value() && innermost_frame_address >= maybe_kernel_base.value();
if (event.type == Event::Type::Signpost)
dbgln("size: {}", sizeof(Event));
if (event.data.has<Event::SignpostData>())
signposts.append(move(event));
else
events.append(move(event));

74
Userland/DevTools/Profiler/Profile.h
View file

@ -20,6 +20,7 @@
#include <AK/NonnullRefPtrVector.h>
#include <AK/OwnPtr.h>
#include <AK/Result.h>
#include <AK/Variant.h>
#include <LibELF/Image.h>
#include <LibGUI/Forward.h>
#include <LibGUI/ModelIndex.h>
@ -163,38 +164,57 @@ public:
};
struct Event {
enum class Type {
Free,
Malloc,
Mmap,
Munmap,
ProcessCreate,
ProcessExec,
ProcessExit,
Sample,
Signpost,
ThreadCreate,
ThreadExit,
};
Type type {};
EventSerialNumber serial;
u64 timestamp { 0 };
FlatPtr ptr { 0 };
size_t size { 0 };
String name;
int parent_pid { 0 };
int parent_tid { 0 };
String executable;
int pid { 0 };
int tid { 0 };
EventSerialNumber serial;
pid_t pid { 0 };
pid_t tid { 0 };
u32 lost_samples { 0 };
bool in_kernel { false };
// FIXME: Put event type-specific arguments in a union to save memory.
String signpost_string;
FlatPtr arg2 {};
Vector<Frame> frames;
struct SampleData {
};
struct MallocData {
FlatPtr ptr {};
size_t size {};
};
struct FreeData {
FlatPtr ptr {};
};
struct SignpostData {
String string;
FlatPtr arg {};
};
struct MmapData {
FlatPtr ptr {};
size_t size {};
String name;
};
struct MunmapData {
FlatPtr ptr {};
size_t size {};
};
struct ProcessCreateData {
pid_t parent_pid { 0 };
String executable;
};
struct ProcessExecData {
String executable;
};
struct ThreadCreateData {
pid_t parent_tid {};
};
Variant<std::nullptr_t, SampleData, MallocData, FreeData, SignpostData, MmapData, MunmapData, ProcessCreateData, ProcessExecData, ThreadCreateData> data { nullptr };
};
const Vector<Event>& events() const { return m_events; }

3
Userland/DevTools/Profiler/TimelineTrack.cpp
View file

@ -135,7 +135,8 @@ void TimelineTrack::mousemove_event(GUI::MouseEvent& event)
constexpr int hoverable_padding = 2;
Gfx::IntRect hoverable_rect { x - hoverable_padding, frame_thickness(), hoverable_padding * 2, height() - frame_thickness() * 2 };
if (hoverable_rect.contains_horizontally(event.x())) {
GUI::Application::the()->show_tooltip_immediately(String::formatted("{}, {}", signpost.signpost_string, signpost.arg2), this);
auto const& data = signpost.data.template get<Profile::Event::SignpostData>();
GUI::Application::the()->show_tooltip_immediately(String::formatted("{}, {}", data.string, data.arg), this);
hovering_a_signpost = true;
return IterationDecision::Break;
}