From: Keith Owens <kaos@sgi.com>
To: linux-ia64@vger.kernel.org
Subject: [Linux-ia64] Re: ia64_spinlock_contention and NEW_LOCK
Date: Thu, 13 Mar 2003 22:20:12 +0000 [thread overview]
Message-ID: <marc-linux-ia64-105590709806087@msgid-missing> (raw)
In-Reply-To: <marc-linux-ia64-105590709806055@msgid-missing>
On Thu, 13 Mar 2003 14:14:44 -0800,
David Mosberger <davidm@napali.hpl.hp.com> wrote:
>>>>>> On Fri, 14 Mar 2003 08:59:54 +1100, Keith Owens <kaos@sgi.com> said:
>
> Keith> All is not lost, there is one spare slot in spin_lock which
> Keith> can clear r29 (dummy ar.pfs) before entering
> Keith> ia64_spinlock_contention.
>
>But that won't work for leaf routines as that would permanently
>clobber pfs.
I am not touching the real ar.pfs, precisely to avoid changing leaf
routines. Setting r29 to 0 and .save ar.pfs, r29 in ia64_unwind_contention
will fool the unwind code into doing the unwind correctly but without
changing the state of the routine using spin_lock().
next prev parent reply other threads:[~2003-03-13 22:20 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-03-12 10:19 [Linux-ia64] Re: ia64_spinlock_contention and NEW_LOCK Keith Owens
2003-03-12 10:35 ` Keith Owens
2003-03-12 17:27 ` David Mosberger
2003-03-12 21:18 ` Keith Owens
2003-03-12 21:51 ` Keith Owens
2003-03-13 19:16 ` David Mosberger
2003-03-13 21:59 ` Keith Owens
2003-03-13 22:14 ` David Mosberger
2003-03-13 22:20 ` Keith Owens [this message]
2003-03-13 22:26 ` David Mosberger
2003-03-13 22:42 ` Keith Owens
2003-03-13 22:46 ` David Mosberger
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