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Kernel: Add syscall performance event type

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This allows tracing the syscalls made by a thread through the kernel's
performance event framework, which is similar in principle to strace.

Currently, this merely logs a stack backtrace to the current thread's
performance event buffer whenever a syscall is made, if profiling is
enabled. Future improvements could include tracing the arguments and
the return value, for example.
This commit is contained in:
Jean-Baptiste Boric 2021-08-10 21:02:59 +02:00 • committed by Andreas Kling
parent 4c4b8ea443
commit 0286160b62
6 changed files with 24 additions and 1 deletions
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3
Kernel/Syscall.cpp
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@ -9,6 +9,7 @@
#include <Kernel/Arch/x86/TrapFrame.h>
#include <Kernel/Memory/MemoryManager.h>
#include <Kernel/Panic.h>
#include <Kernel/PerformanceManager.h>
#include <Kernel/Process.h>
#include <Kernel/Sections.h>
#include <Kernel/ThreadTracer.h>
@ -108,6 +109,8 @@ KResultOr<FlatPtr> handle(RegisterState& regs, FlatPtr function, FlatPtr arg1, F
auto& process = current_thread->process();
current_thread->did_syscall();
PerformanceManager::add_syscall_event(*current_thread, regs);
if (function >= Function::__Count) {
dbgln("Unknown syscall {} requested ({:p}, {:p}, {:p}, {:p})", function, arg1, arg2, arg3, arg4);
return ENOSYS;