From: Arun Sharma <arun.sharma@intel.com>
To: linux-ia64@vger.kernel.org
Subject: Re: Long Format VHPT patches
Date: Fri, 27 Aug 2004 17:15:35 +0000 [thread overview]
Message-ID: <412F6C37.1070301@intel.com> (raw)
In-Reply-To: <20040825023439.GA15782@cse.unsw.EDU.AU>
On 8/26/2004 2:20 PM, Peter Chubb wrote:
>>>>>> "Christoph" = Christoph Lameter <christoph@lameter.com> writes:
>
> Christoph> One issue that bothers me is that it is no longer possible
> Christoph> to swap pte, pmd and pgd entries via cmpxchg. My page fault
> Christoph> scalability patches are based on that ability. The Itanium
> Christoph> can only do a cmpxchg with a 64 bit value. The long VHPT
> Christoph> entries are 32 bytes long.
>
> I don't think that that's an issue at present: in our patch, the
> hardware-walked long format VHPT is used as a cache of the existing
> linux 3-level table, kind of like a software loaded TLB. Thus your
> cmpxchg stuff on the pagetables will still work.
>
And long format VHPTs are per CPU. So no cmpxchg should be necessary.
-Arun
next prev parent reply other threads:[~2004-08-27 17:15 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-25 2:34 Long Format VHPT patches Ian Wienand
2004-08-25 17:01 ` Jesse Barnes
2004-08-25 17:12 ` Chen, Kenneth W
2004-08-25 20:17 ` Arun Sharma
2004-08-25 22:46 ` Peter Chubb
2004-08-26 20:19 ` Christoph Lameter
2004-08-26 21:20 ` Peter Chubb
2004-08-27 17:15 ` Arun Sharma [this message]
2004-08-31 5:53 ` Ian Wienand
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