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Profiler: Use sequential serial numbers for profiling events

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Previously Profiler was using timestamps to distinguish processes.
However it is possible that separate processes with the same PID exist
at the exact same timestamp (e.g. for execve). This changes Profiler
to use unique serial numbers for each event instead.
This commit is contained in:
Gunnar Beutner 2021-06-02 21:16:57 +02:00 • committed by Linus Groh
parent af72b5ec82
commit a607f13fc7
8 changed files with 125 additions and 47 deletions
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40
Userland/DevTools/Profiler/Profile.cpp
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@ -61,10 +61,10 @@ void Profile::rebuild_tree()
{
Vector<NonnullRefPtr<ProfileNode>> roots;
auto find_or_create_process_node = [this, &roots](pid_t pid, u64 timestamp) -> ProfileNode& {
auto* process = find_process(pid, timestamp);
auto find_or_create_process_node = [this, &roots](pid_t pid, EventSerialNumber serial) -> ProfileNode& {
auto* process = find_process(pid, serial);
if (!process) {
dbgln("Profile contains event for unknown process with pid={}, timestamp={}", pid, timestamp);
dbgln("Profile contains event for unknown process with pid={}, serial={}", pid, serial.to_number());
VERIFY_NOT_REACHED();
}
for (auto root : roots) {
@ -96,7 +96,7 @@ void Profile::rebuild_tree()
continue;
}
if (!process_filter_contains(event.pid, event.timestamp))
if (!process_filter_contains(event.pid, event.serial))
continue;
m_filtered_event_indices.append(event_index);
@ -123,7 +123,7 @@ void Profile::rebuild_tree()
if (!m_show_top_functions) {
ProfileNode* node = nullptr;
auto& process_node = find_or_create_process_node(event.pid, event.timestamp);
auto& process_node = find_or_create_process_node(event.pid, event.serial);
process_node.increment_event_count();
for_each_frame([&](const Frame& frame, bool is_innermost_frame) {
auto& object_name = frame.object_name;
@ -147,7 +147,7 @@ void Profile::rebuild_tree()
return IterationDecision::Continue;
});
} else {
auto& process_node = find_or_create_process_node(event.pid, event.timestamp);
auto& process_node = find_or_create_process_node(event.pid, event.serial);
process_node.increment_event_count();
for (size_t i = 0; i < event.frames.size(); ++i) {
ProfileNode* node = nullptr;
@ -163,7 +163,7 @@ void Profile::rebuild_tree()
// FIXME: More PID/TID mixing cheats here:
if (!node) {
node = &find_or_create_process_node(event.pid, event.timestamp);
node = &find_or_create_process_node(event.pid, event.serial);
node = &node->find_or_create_child(object_name, symbol, address, offset, event.timestamp, event.pid);
root = node;
root->will_track_seen_events(m_events.size());
@ -219,12 +219,15 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
NonnullOwnPtrVector<Process> all_processes;
HashMap<pid_t, Process*> current_processes;
Vector<Event> events;
EventSerialNumber next_serial;
for (auto& perf_event_value : perf_events.values()) {
auto& perf_event = perf_event_value.as_object();
Event event;
event.serial = next_serial;
next_serial.increment();
event.timestamp = perf_event.get("timestamp").to_number<u64>();
event.lost_samples = perf_event.get("lost_samples").to_number<u32>();
event.type = perf_event.get("type").to_string();
@ -257,7 +260,8 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
.pid = event.pid,
.executable = event.executable,
.basename = LexicalPath(event.executable).basename(),
.start_valid = event.timestamp,
.start_valid = event.serial,
.end_valid = {},
});
current_processes.set(sampled_process->pid, sampled_process);
@ -267,7 +271,7 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
event.executable = perf_event.get("executable").to_string();
auto old_process = current_processes.get(event.pid).value();
old_process->end_valid = event.timestamp;
old_process->end_valid = event.serial;
current_processes.remove(event.pid);
@ -275,14 +279,16 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
.pid = event.pid,
.executable = event.executable,
.basename = LexicalPath(event.executable).basename(),
.start_valid = event.timestamp });
.start_valid = event.serial,
.end_valid = {},
});
current_processes.set(sampled_process->pid, sampled_process);
all_processes.append(move(sampled_process));
continue;
} else if (event.type == "process_exit"sv) {
auto old_process = current_processes.get(event.pid).value();
old_process->end_valid = event.timestamp;
old_process->end_valid = event.serial;
current_processes.remove(event.pid);
continue;
@ -290,12 +296,12 @@ Result<NonnullOwnPtr<Profile>, String> Profile::load_from_perfcore_file(const St
event.parent_tid = perf_event.get("parent_tid").to_i32();
auto it = current_processes.find(event.pid);
if (it != current_processes.end())
it->value->handle_thread_create(event.tid, event.timestamp);
it->value->handle_thread_create(event.tid, event.serial);
continue;
} else if (event.type == "thread_exit"sv) {
auto it = current_processes.find(event.pid);
if (it != current_processes.end())
it->value->handle_thread_exit(event.tid, event.timestamp);
it->value->handle_thread_exit(event.tid, event.serial);
continue;
}
@ -385,7 +391,7 @@ void Profile::clear_timestamp_filter_range()
m_samples_model->update();
}
void Profile::add_process_filter(pid_t pid, u64 start_valid, u64 end_valid)
void Profile::add_process_filter(pid_t pid, EventSerialNumber start_valid, EventSerialNumber end_valid)
{
auto filter = ProcessFilter { pid, start_valid, end_valid };
if (m_process_filters.contains_slow(filter))
@ -398,7 +404,7 @@ void Profile::add_process_filter(pid_t pid, u64 start_valid, u64 end_valid)
m_samples_model->update();
}
void Profile::remove_process_filter(pid_t pid, u64 start_valid, u64 end_valid)
void Profile::remove_process_filter(pid_t pid, EventSerialNumber start_valid, EventSerialNumber end_valid)
{
auto filter = ProcessFilter { pid, start_valid, end_valid };
if (!m_process_filters.contains_slow(filter))
@ -424,13 +430,13 @@ void Profile::clear_process_filter()
m_samples_model->update();
}
bool Profile::process_filter_contains(pid_t pid, u32 timestamp)
bool Profile::process_filter_contains(pid_t pid, EventSerialNumber serial)
{
if (!has_process_filter())
return true;
for (auto const& process_filter : m_process_filters)
if (pid == process_filter.pid && timestamp >= process_filter.start_valid && timestamp <= process_filter.end_valid)
if (pid == process_filter.pid && serial >= process_filter.start_valid && serial <= process_filter.end_valid)
return true;
return false;