From: Arjan van de Ven <arjan@linux.intel.com>
To: "Thomas Hellström" <thomas@tungstengraphics.com>
Cc: Andi Kleen <andi@firstfloor.org>,
Dave Airlie <airlied@redhat.com>,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@redhat.com
Subject: Re: [PATCH] x86: create array based interface to change page attribute
Date: Mon, 31 Mar 2008 09:08:02 -0700 [thread overview]
Message-ID: <47F10C62.7040500@linux.intel.com> (raw)
In-Reply-To: <47F0C6C2.2000004@tungstengraphics.com>
Thomas Hellström wrote:
> Let me rehprase. Not really time-critical but it is of some importance
> that CPA is done quickly.
> We're dealing with the tradeoff of reading from uncached device memory
uncached or write combining ?
> vs taking the pages out of
> AGP, setting up a cache-coherent mapping, read and then change back.
> What we'd really would like to set up is a pool of completely unmapped
> (like highmem) pages. Then we could, to a large extent, avoid the CPA
> calls.
changing attributes by nature means a tlb flush and a bunch of expensive cache work.
That's never going to be cheap, I guess it all depends on how much work you do
on the memory for it to pay off or not...
next prev parent reply other threads:[~2008-03-31 16:10 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-03-31 5:19 [PATCH] x86: create array based interface to change page attribute Dave Airlie
2008-03-31 6:54 ` Thomas Hellström
2008-03-31 9:33 ` Arjan van de Ven
2008-03-31 11:04 ` Thomas Hellström
2008-03-31 7:25 ` Andi Kleen
2008-03-31 7:55 ` Thomas Hellström
2008-03-31 8:38 ` Andi Kleen
2008-03-31 9:06 ` Thomas Hellström
2008-03-31 9:18 ` Andi Kleen
2008-03-31 11:10 ` Thomas Hellström
2008-03-31 16:08 ` Arjan van de Ven [this message]
2008-03-31 16:41 ` Thomas Hellström
2008-03-31 16:49 ` Arjan van de Ven
2008-03-31 17:26 ` Thomas Hellström
2008-04-01 20:58 ` Arjan van de Ven
2008-04-01 21:29 ` Thomas Hellström
2008-04-01 22:30 ` Arjan van de Ven
2008-04-02 6:30 ` Thomas Hellström
2008-04-02 6:35 ` Arjan van de Ven
2008-04-02 6:59 ` Thomas Hellström
2008-04-02 14:01 ` Arjan van de Ven
2008-04-02 17:57 ` Thomas Hellström
2008-04-07 18:23 ` Jesse Barnes
2008-04-07 19:51 ` Thomas Hellström
2008-04-07 19:59 ` Jesse Barnes
2008-04-07 20:46 ` Thomas Hellström
2008-04-07 20:57 ` Arjan van de Ven
2008-04-08 6:12 ` Thomas Hellström
2008-04-07 21:04 ` Jesse Barnes
2008-04-08 6:21 ` Thomas Hellström
2008-04-08 14:27 ` Jesse Barnes
2008-04-07 20:56 ` Arjan van de Ven
2008-04-07 21:02 ` Jesse Barnes
2008-04-07 21:09 ` Jesse Barnes
2008-03-31 9:56 ` Arjan van de Ven
2008-03-31 11:21 ` Dave Airlie
2008-03-31 11:46 ` Andi Kleen
2008-04-02 1:35 ` Dave Airlie
2008-04-01 18:20 ` Arjan van de Ven
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