Re: 2.6.16-rt10

[Ingo Molnar]

* Simon Derr <simon.derr@xxxxxxxx> wrote:

> On Mon, 27 Mar 2006, Ingo Molnar wrote:
> 
> > i've released -rt10
> 
> Is anyone working on a port of this patch to the IA64 architecture ?

not that i know of. If someone wants to do that, take a look at the 
x86_64 changes (or ppc/mips/i386 changes) to get an idea. These are the 
rough steps needed:

 - do the raw_spinlock_t/rwlock_t -> __raw_spinlock_t/rwlock_t rename

 - change the APIs in asm-ia64/semaphore.h (and arch files) to
   compat_up()/down()/etc.

 - in the arch Kconfig, turn off RWSEM_XCHGADD_ALGORITHM if PREEMPT_RT.

 - add the TID_NEED_RESCHED_DELAYED logic to thread_info.h and the entry
   assembly code.

 - change most/all spinlocks in arch/ia64 to raw_spinlock / RAW_SPINLOCK

 - change most/all seqlocks to raw_seqlock / RAW_SEQLOCK

 - add smp_send_reschedule_allbutself().

 - take a good look at the arch/x86_64/kernel/process.c changes and port
   the need_resched_delayed() and __schedule() changes.

that should be at least 95% of what's needed. (the x86_64 port does a 
couple of other things too, like latency tracing support, etc., but you 
dont need those for the initial ia64 port.)

	Ingo
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