Kernel: Track performance events for context switches

Author: https://github.com/gunnarbeutner
Commit: 8b2ace0326
Pull-request: https://github.com/SerenityOS/serenity/pull/7246
Reviewed-by: https://github.com/tomuta

Kernel/Scheduler.cpp

@@ -10,6 +10,7 @@
 #include <AK/Time.h>
 #include <Kernel/Debug.h>
 #include <Kernel/Panic.h>
+#include <Kernel/PerformanceManager.h>
 #include <Kernel/Process.h>
 #include <Kernel/RTC.h>
 #include <Kernel/Scheduler.h>
@@ -365,6 +366,8 @@ bool Scheduler::context_switch(Thread* thread)
     }
     thread->set_state(Thread::Running);
 
+    PerformanceManager::add_context_switch_perf_event(*from_thread, *thread);
+
     proc.switch_context(from_thread, thread);
 
     // NOTE: from_thread at this point reflects the thread we were