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Kernel+lsirq: Track per-CPU IRQ handler call counts

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Each GenericInterruptHandler now tracks the number of calls that each
CPU has serviced.

This takes care of a FIXME in the /sys/kernel/interrupts generator.

Also, the lsirq command line tool now displays per-CPU call counts.
This commit is contained in:
Andreas Kling 2022-11-18 22:07:57 +01:00
parent 94b514b981
commit fb00d3ed25
4 changed files with 33 additions and 9 deletions
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7
Kernel/Interrupts/GenericInterruptHandler.cpp
View file

@ -67,9 +67,14 @@ void GenericInterruptHandler::change_interrupt_number(u8 number)
register_generic_interrupt_handler(InterruptManagement::acquire_mapped_interrupt_number(interrupt_number()), *this);
}
Span<u32 const> GenericInterruptHandler::per_cpu_call_counts() const
{
return m_per_cpu_call_counts.span().slice(0, Processor::count());
}
void GenericInterruptHandler::increment_call_count()
{
++m_call_count;
++m_per_cpu_call_counts[Processor::current_id()];
}
}

5
Kernel/Interrupts/GenericInterruptHandler.h
View file

@ -37,7 +37,7 @@ public:
u8 interrupt_number() const { return m_interrupt_number; }
u32 call_count() const { return m_call_count; }
Span<u32 const> per_cpu_call_counts() const;
virtual size_t sharing_devices_count() const = 0;
virtual bool is_shared_handler() const = 0;
@ -57,7 +57,8 @@ protected:
void disable_remap() { m_disable_remap = true; }
private:
Atomic<u32, AK::MemoryOrder::memory_order_relaxed> m_call_count { 0 };
Array<u32, MAX_CPU_COUNT> m_per_cpu_call_counts {};
u8 m_interrupt_number { 0 };
bool m_disable_remap { false };
bool m_registered { false };