Re: [PATCH for 2.5] preemptible kernel

Nigel Gamble
2001-03-21T03:36:34Z

On Wed, 21 Mar 2001, Keith Owens wrote:
> I misread the code, but the idea is still correct. Add a preemption
> depth counter to each cpu, when you schedule and the depth is zero then
> you know that the cpu is no longer holding any references to quiesced
> structures.

A task that has been preempted is on the run queue and can be
rescheduled on a different CPU, so I can't see how a per-CPU counter
would work. It seems to me that you would need a per run queue
counter, like the example I gave in a previous posting.

Nigel Gamble nigel@nrg.org
Mountain View, CA, USA. http://www.nrg.org/

MontaVista Software nigel@mvista.com