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Kernel: Better handling of allocation failure in profiling

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If we can't allocate a PerformanceEventBuffer to store the profiling
events, we now fail sys$profiling_enable() and sys$perf_event()
with ENOMEM instead of carrying on with a broken buffer.
This commit is contained in:
Andreas Kling
2021-03-02 16:55:54 +01:00
parent e7ef729db3
commit b425c2602c
6 changed files with 26 additions and 18 deletions
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9
Kernel/Process.cpp
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@@ -667,11 +667,12 @@ void Process::tracer_trap(Thread& thread, const RegisterState& regs)
thread.send_urgent_signal_to_self(SIGTRAP);
}
PerformanceEventBuffer& Process::ensure_perf_events()
bool Process::create_perf_events_buffer_if_needed()
{
if (!m_perf_event_buffer)
m_perf_event_buffer = make<PerformanceEventBuffer>();
return *m_perf_event_buffer;
if (!m_perf_event_buffer) {
m_perf_event_buffer = PerformanceEventBuffer::try_create_with_size(4 * MiB);
}
return !!m_perf_event_buffer;
}
bool Process::remove_thread(Thread& thread)