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Subject2.4.x: spinlock problem

I had reported this before: In 2.4.0 getting exact system time from
interrupt handlers seems inaccurate (in 2.2.18 it works fine). I have
applied the same modifications to the 2.4 code base as to 2.2.

With 2.4.1 the kernel is incredibly slow, so you can watch the
individual lines of kernel boot be printed on the screen.

I checked the spinlocks, but could not find a problem. Before I start
removing the new spinlocks for timer, PIC and RTC, I'd like to hear
what the gurus might think.

I also tried to find out how I can profile the kernel or trace the
spinlocks, but that seems to be hardly documented.

Any hints?


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