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Kernel: Don't log profile data before/after the process/thread lifetime

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There were a few cases where we could end up logging profiling events
before or after the associated process or thread exists in the profile:

After enabling profiling we might end up with CPU samples before we
had a chance to synthesize process/thread creation events.

After a thread exits we would still log associated kmalloc/kfree
events. Instead we now just ignore those events.
This commit is contained in:
Gunnar Beutner 2021-05-30 16:24:53 +02:00 • committed by Andreas Kling
parent d24dd7a3df
commit 01c75e3a34
8 changed files with 39 additions and 22 deletions
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22
Kernel/PerformanceManager.h
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@ -40,6 +40,8 @@ public:
inline static void add_thread_created_event(Thread& thread)
{
if (thread.is_profiling_suppressed())
return;
if (auto* event_buffer = thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append(PERF_EVENT_THREAD_CREATE, thread.tid().value(), 0, nullptr, &thread);
}
@ -47,6 +49,8 @@ public:
inline static void add_thread_exit_event(Thread& thread)
{
// As an exception this doesn't check whether profiling is suppressed for
// the thread so we can record the thread_exit event anyway.
if (auto* event_buffer = thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append(PERF_EVENT_THREAD_EXIT, thread.tid().value(), 0, nullptr, &thread);
}
@ -54,6 +58,8 @@ public:
inline static void add_cpu_sample_event(Thread& current_thread, const RegisterState& regs, u32 lost_time)
{
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append_with_eip_and_ebp(
current_thread.pid(), current_thread.tid(),
@ -77,27 +83,35 @@ public:
inline static void add_context_switch_perf_event(Thread& current_thread, Thread& next_thread)
{
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_CONTEXT_SWITCH, next_thread.pid().value(), next_thread.tid().value(), nullptr);
}
}
inline static void add_kmalloc_perf_event(Process& current_process, size_t size, FlatPtr ptr)
inline static void add_kmalloc_perf_event(Thread& current_thread, size_t size, FlatPtr ptr)
{
if (auto* event_buffer = current_process.current_perf_events_buffer()) {
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_KMALLOC, size, ptr, nullptr);
}
}
inline static void add_kfree_perf_event(Process& current_process, size_t size, FlatPtr ptr)
inline static void add_kfree_perf_event(Thread& current_thread, size_t size, FlatPtr ptr)
{
if (auto* event_buffer = current_process.current_perf_events_buffer()) {
if (current_thread.is_profiling_suppressed())
return;
if (auto* event_buffer = current_thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto res = event_buffer->append(PERF_EVENT_KFREE, size, ptr, nullptr);
}
}
inline static void add_page_fault_event(Thread& thread, const RegisterState& regs)
{
if (thread.is_profiling_suppressed())
return;
if (auto* event_buffer = thread.process().current_perf_events_buffer()) {
[[maybe_unused]] auto rc = event_buffer->append_with_eip_and_ebp(
thread.pid(), thread.tid(),