Zhao Yakui wrote:
Of course such laptops can still work well except that CPU
interrupt will be disabled for some extra time after Alexey's patch is
applied .(The some extra time depends on how many EC Inb/out operations
are executed).
spinlock is released after each I/O, so by your own calculation
it is disabled for 1.5 usec.
You can then multiply this number by lifetime of the universe,
it does not mean anything.
Regards,
Alex.
In my email the purpose that I point out 2000 EC I/O read/write
operation doesn't indicate that 2000 EC I/O read/write will be executed
per second. What I want to say is that EC I/O read/write is slow
operation. If quite a lot of EC I/O read/write are accessed for some
reasons in some time, the CPU interrupt will be disabled for a long
time. In such case the normal laptop will be affected by this. (Of
course maybe the affect will be very tiny).
In fact in kernel source code if the race can be resolved by other
synchronization protection mechanism, the spin_lock had better be
avoided.
Please explain, I'd like to make poster of it :)
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