Profiler: Add ability to process read syscalls

Profiler can now process and display read events.

Userland/DevTools/Profiler/Profile.cpp

@@ -369,6 +369,15 @@ ErrorOr<NonnullOwnPtr<Profile>> Profile::load_from_perfcore_file(StringView path
             if (it != current_processes.end())
                 it->value->handle_thread_exit(event.tid, event.serial);
             continue;
+        } else if (type_string == "read"sv) {
+            const auto string_index = perf_event.get("filename_index"sv).to_number<FlatPtr>();
+            event.data = Event::ReadData {
+                .fd = perf_event.get("fd"sv).to_number<int>(),
+                .size = perf_event.get("size"sv).to_number<size_t>(),
+                .path = profile_strings.get(string_index).value(),
+                .start_timestamp = perf_event.get("start_timestamp"sv).to_number<size_t>(),
+                .success = perf_event.get("success"sv).to_bool()
+            };
         } else {
             dbgln("Unknown event type '{}'", type_string);
             VERIFY_NOT_REACHED();

Userland/DevTools/Profiler/Profile.h

@@ -221,7 +221,15 @@ public:
             pid_t parent_tid {};
         };
 
-        Variant<std::nullptr_t, SampleData, MallocData, FreeData, SignpostData, MmapData, MunmapData, ProcessCreateData, ProcessExecData, ThreadCreateData> data { nullptr };
+        struct ReadData {
+            int fd;
+            size_t size;
+            String path;
+            size_t start_timestamp;
+            bool success;
+        };
+
+        Variant<std::nullptr_t, SampleData, MallocData, FreeData, SignpostData, MmapData, MunmapData, ProcessCreateData, ProcessExecData, ThreadCreateData, ReadData> data { nullptr };
     };
 
     Vector<Event> const& events() const { return m_events; }

Userland/DevTools/Profiler/SamplesModel.cpp

@@ -48,6 +48,8 @@ String SamplesModel::column_name(int column) const
         return "Lost Samples";
     case Column::InnermostStackFrame:
         return "Innermost Frame";
+    case Column::Path:
+        return "Path";
     default:
         VERIFY_NOT_REACHED();
     }
@@ -89,6 +91,13 @@ GUI::Variant SamplesModel::data(GUI::ModelIndex const& index, GUI::ModelRole rol
         if (index.column() == Column::InnermostStackFrame) {
             return event.frames.last().symbol;
         }
+
+        if (index.column() == Column::Path) {
+            if (!event.data.has<Profile::Event::ReadData>())
+                return "";
+            return event.data.get<Profile::Event::ReadData>().path;
+        }
+
         return {};
     }
     return {};

Userland/DevTools/Profiler/SamplesModel.h

@@ -27,6 +27,7 @@ public:
         ExecutableName,
         LostSamples,
         InnermostStackFrame,
+        Path,
         __Count
     };