Messages in this thread | | | Date | Wed, 29 Mar 2006 09:55:57 +0200 (CEST) | From | Simon Derr <> | Subject | Re: 2.6.16-rt10 |
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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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