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Kernel: Add PerformanceManager static class, move perf event APIs there

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The current method of emitting performance events requires a bit of
boiler plate at every invocation, as well as having to ignore the
return code which isn't used outside of the perf event syscall. This
change attempts to clean that up by exposing high level API's that
can be used around the code base.
This commit is contained in:
Brian Gianforcaro 2021-05-06 22:29:19 -07:00 • committed by Andreas Kling
parent 43b3fd748a
commit ccdcb6a635
7 changed files with 70 additions and 33 deletions
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13
Kernel/Syscalls/thread.cpp
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@ -8,7 +8,7 @@
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/StringView.h>
#include <Kernel/PerformanceEventBuffer.h>
#include <Kernel/PerformanceManager.h>
#include <Kernel/Process.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/PageDirectory.h>
@ -70,9 +70,7 @@ KResultOr<int> Process::sys$create_thread(void* (*entry)(void*), Userspace<const
if (tsr_result.is_error())
return tsr_result.error();
if (m_perf_event_buffer) {
[[maybe_unused]] auto rc = m_perf_event_buffer->append(PERF_EVENT_THREAD_CREATE, thread->tid().value(), 0, nullptr);
}
PerformanceManager::add_thread_created_event(*thread);
ScopedSpinLock lock(g_scheduler_lock);
thread->set_priority(requested_thread_priority);
@ -89,11 +87,10 @@ void Process::sys$exit_thread(Userspace<void*> exit_value)
this->sys$exit(0);
}
if (auto* event_buffer = current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append(PERF_EVENT_THREAD_EXIT, 0, 0, nullptr);
}
auto current_thread = Thread::current();
PerformanceManager::add_thread_exit_event(*current_thread);
Thread::current()->exit(reinterpret_cast<void*>(exit_value.ptr()));
current_thread->exit(reinterpret_cast<void*>(exit_value.ptr()));
VERIFY_NOT_REACHED();
}