Re: 2.6.16-rt10

[Simon Derr]

On Tue, 28 Mar 2006, Ingo Molnar wrote:

> > 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.)

Thanks a lot for your reply, Ingo, and for these hints on how to begin.

	Simon.

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