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Kernel+Profiler: Improve profiling subsystem

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This turns the perfcore format into more a log than it was before,
which lets us properly log process, thread and region
creation/destruction. This also makes it unnecessary to dump the
process' regions every time it is scheduled like we did before.

Incidentally this also fixes 'profile -c' because we previously ended
up incorrectly dumping the parent's region map into the profile data.

Log-based mmap support enables profiling shared libraries which
are loaded at runtime, e.g. via dlopen().

This enables profiling both the parent and child process for
programs which use execve(). Previously we'd discard the profiling
data for the old process.

The Profiler tool has been updated to not treat thread IDs as
process IDs anymore. This enables support for processes with more
than one thread. Also, there's a new widget to filter which
process should be displayed.
This commit is contained in:
Gunnar Beutner 2021-04-25 23:42:36 +02:00 • committed by Andreas Kling
parent f57c57966b
commit eb798d5538
26 changed files with 658 additions and 292 deletions
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73
Userland/DevTools/Profiler/Profile.h
View file

@ -6,6 +6,7 @@
#pragma once
#include "Process.h"
#include <AK/Bitmap.h>
#include <AK/FlyString.h>
#include <AK/JsonArray.h>
@ -24,49 +25,6 @@ class Profile;
class ProfileModel;
class SamplesModel;
struct MappedObject {
NonnullRefPtr<MappedFile> file;
ELF::Image elf;
};
extern HashMap<String, OwnPtr<MappedObject>> g_mapped_object_cache;
class LibraryMetadata {
public:
explicit LibraryMetadata(JsonArray regions);
struct Library {
FlatPtr base;
size_t size;
String name;
FlatPtr text_base;
MappedObject* object { nullptr };
String symbolicate(FlatPtr, u32* offset) const;
};
const Library* library_containing(FlatPtr) const;
private:
mutable HashMap<String, OwnPtr<Library>> m_libraries;
JsonArray m_regions;
};
struct Process {
pid_t pid {};
String executable;
HashTable<int> threads;
struct Region {
String name;
FlatPtr base {};
size_t size {};
};
Vector<Region> regions;
NonnullOwnPtr<LibraryMetadata> library_metadata;
};
class ProfileNode : public RefCounted<ProfileNode> {
public:
static NonnullRefPtr<ProfileNode> create(FlyString object_name, String symbol, u32 address, u32 offset, u64 timestamp, pid_t pid)
@ -137,7 +95,7 @@ public:
pid_t pid() const { return m_pid; }
const Process* process(Profile&) const;
const Process* process(Profile&, u64 timestamp) const;
private:
explicit ProfileNode(const String& object_name, String symbol, u32 address, u32 offset, u64 timestamp, pid_t);
@ -165,10 +123,10 @@ public:
GUI::Model& samples_model();
GUI::Model* disassembly_model();
const Process* find_process(pid_t pid) const
const Process* find_process(pid_t pid, u64 timestamp) const
{
auto it = m_processes.find_if([&](auto& entry) {
return entry.pid == pid;
return entry.pid == pid && entry.valid_at(timestamp);
});
return it.is_end() ? nullptr : &(*it);
}
@ -189,15 +147,18 @@ public:
String type;
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 };
bool in_kernel { false };
Vector<Frame> frames;
};
u32 first_filtered_event_index() const { return m_first_filtered_event_index; }
u32 filtered_event_count() const { return m_filtered_event_count; }
const Vector<Event>& events() const { return m_events; }
const Vector<size_t>& filtered_event_indices() const { return m_filtered_event_indices; }
u64 length_in_ms() const { return m_last_timestamp - m_first_timestamp; }
u64 first_timestamp() const { return m_first_timestamp; }
@ -208,6 +169,10 @@ public:
void clear_timestamp_filter_range();
bool has_timestamp_filter_range() const { return m_has_timestamp_filter_range; }
void set_process_filter(pid_t pid, u64 start_valid, u64 end_valid);
void clear_process_filter();
bool has_process_filter() const { return m_has_process_filter; }
bool is_inverted() const { return m_inverted; }
void set_inverted(bool);
@ -216,6 +181,8 @@ public:
bool show_percentages() const { return m_show_percentages; }
void set_show_percentages(bool);
const Vector<Process>& processes() const { return m_processes; }
template<typename Callback>
void for_each_event_in_filter_range(Callback callback)
{
@ -241,8 +208,7 @@ private:
GUI::ModelIndex m_disassembly_index;
Vector<NonnullRefPtr<ProfileNode>> m_roots;
u32 m_filtered_event_count { 0 };
size_t m_first_filtered_event_index { 0 };
Vector<size_t> m_filtered_event_indices;
u64 m_first_timestamp { 0 };
u64 m_last_timestamp { 0 };
@ -253,6 +219,11 @@ private:
u64 m_timestamp_filter_range_start { 0 };
u64 m_timestamp_filter_range_end { 0 };
bool m_has_process_filter { false };
pid_t m_process_filter_pid { 0 };
u64 m_process_filter_start_valid { 0 };
u64 m_process_filter_end_valid { 0 };
u32 m_deepest_stack_depth { 0 };
bool m_inverted { false };
bool m_show_top_functions { false };