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[Qemu-devel] Debugging IRQ latency
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From: |
Pavel Janík |
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Subject: |
[Qemu-devel] Debugging IRQ latency |
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Date: |
Fri, 21 May 2004 22:35:35 +0200 |
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User-agent: |
Gnus/5.110002 (No Gnus v0.2) Emacs/21.3 (gnu/linux) |
Hi,
hw/i8259.c contains (when DEBUG_ is turned on):
(double)(cpu_get_ticks() - irq_time[irq]) * 1000000.0 /
ticks_per_sec);
but cpu_get_ticks is defined as static in vl.c:
static inline int64_t cpu_get_ticks(void)
Thus you can't debug IRQ latency.
--
Pavel Janík
Proving me wrong is always a good sport ;)
-- Linus Torvalds in linux-kernel
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