* differences in between 2.0 and 2.1 SMP?
@ 1998-11-23 17:34 root
1998-11-24 0:29 ` Alan Cox
0 siblings, 1 reply; 2+ messages in thread
From: root @ 1998-11-23 17:34 UTC (permalink / raw)
To: linux-kernel
What are the architectural differences between SMP code in 2.0 and 2.1?
I'm a very beginner kernel hacker and I'm still in the code grepping
stage...
it seems to me that only one of the CPUs can execute the kernel code...
is that correct?
Sorry for the dumb question
Thanks
Paolo
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* Re: differences in between 2.0 and 2.1 SMP?
1998-11-23 17:34 differences in between 2.0 and 2.1 SMP? root
@ 1998-11-24 0:29 ` Alan Cox
0 siblings, 0 replies; 2+ messages in thread
From: Alan Cox @ 1998-11-24 0:29 UTC (permalink / raw)
To: losi; +Cc: linux-kernel
> What are the architectural differences between SMP code in 2.0 and 2.1?
> I'm a very beginner kernel hacker and I'm still in the code grepping
> stage...
> it seems to me that only one of the CPUs can execute the kernel code...
> is that correct?
2.0.x only one CPU is _running_ in kernel at a time (others may be sleeping
on things but inside a kernel sleep). IRQs are forwarded to the CPU that
has the lock
2.1.x IRQs are taken on all CPUs spin locks guard data structures some kernel
subsystems are not subject to the main kernel lock at all
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1998-11-23 17:34 differences in between 2.0 and 2.1 SMP? root
1998-11-24 0:29 ` Alan Cox
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