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Kernel: Generate page fault events from the kernel profiler

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Hook the kernel page fault handler and capture page fault events when
the fault has a current thread attached in TLS. We capture the eip and
ebp so we can unwind the stack and locate which pieces of code are
generating the most page faults.

Co-authored-by: Gunnar Beutner <gbeutner@serenityos.org>
This commit is contained in:
Brian Gianforcaro 2021-05-18 02:26:11 -07:00 • committed by Andreas Kling
parent 6ac1ca5a9a
commit 83fc591cea
7 changed files with 47 additions and 2 deletions
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6
Kernel/Arch/i386/CPU.cpp
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@ -23,6 +23,7 @@
#include <Kernel/Interrupts/UnhandledInterruptHandler.h>
#include <Kernel/KSyms.h>
#include <Kernel/Panic.h>
#include <Kernel/PerformanceManager.h>
#include <Kernel/Process.h>
#include <Kernel/Random.h>
#include <Kernel/Thread.h>
@ -243,8 +244,11 @@ void page_fault_handler(TrapFrame* trap)
auto current_thread = Thread::current();
if (current_thread)
if (current_thread) {
current_thread->set_handling_page_fault(true);
PerformanceManager::add_page_fault_event(*current_thread, regs);
}
ScopeGuard guard = [current_thread] {
if (current_thread)
current_thread->set_handling_page_fault(false);