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Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that support self-snoop

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From: Siddha, Suresh B <suresh.b.siddha@...>
To: Andi Kleen <ak@...>
Cc: Arjan van de Ven <arjan@...>, <tglx@...>, <mingo@...>, <linux-kernel@...>
Subject: Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that support self-snoop
Date: Monday, February 11, 2008 - 1:36 pm

On Mon, Feb 11, 2008 at 04:27:23PM +0100, Andi Kleen wrote:

BTW, making pages not present is required only while changing the attribute
from WB to WC or WC to WB. I think this step is for avoiding attribute aliasing
for speculative accesses. For UC, we don't have speculative accesses and such we
probably don't need it.

So WC support through PAT should take care of it.


True. Perhaps for WC chages we can assume the ownership?

thanks,
suresh
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[PATCH] [0/8] Misc CPA patchkit, Andi Kleen, (Mon Feb 11, 5:50 am)
[PATCH] [8/8] CPA: Add statistics about state of direct mapp..., Andi Kleen, (Mon Feb 11, 5:50 am)
[PATCH] [7/8] CPA: Don't flush caches on CPUs that support s..., Andi Kleen, (Mon Feb 11, 5:50 am)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Arjan van de Ven, (Mon Feb 11, 11:04 am)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Andi Kleen, (Mon Feb 11, 11:12 am)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Arjan van de Ven, (Mon Feb 11, 11:21 am)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Andi Kleen, (Mon Feb 11, 11:27 am)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Siddha, Suresh B, (Mon Feb 11, 1:36 pm)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Andi Kleen, (Mon Feb 11, 1:58 pm)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Siddha, Suresh B, (Mon Feb 11, 3:47 pm)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Arjan van de Ven, (Mon Feb 11, 4:36 pm)
Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that suppo..., Andi Kleen, (Tue Feb 12, 4:45 am)
[PATCH] [6/8] CPA: Remove BUG_ON for LRU/Compound pages, Andi Kleen, (Mon Feb 11, 5:50 am)
Re: [PATCH] [6/8] CPA: Remove BUG_ON for LRU/Compound pages, Thomas Gleixner, (Sun Feb 17, 10:07 am)
[PATCH] [5/8] CPA: Move pool allocation/free into separate f..., Andi Kleen, (Mon Feb 11, 5:50 am)
[PATCH] [4/8] CPA: Ifdef the cpa pool for DEBUG_PAGEALLOC, Andi Kleen, (Mon Feb 11, 5:50 am)
[PATCH] [3/8] CPA: Fix some incorrect comments in the debug ..., Andi Kleen, (Mon Feb 11, 5:50 am)
[PATCH] [2/8] CPA: Remove inline from static_protections, Andi Kleen, (Mon Feb 11, 5:50 am)
Re: [PATCH] [2/8] CPA: Remove inline from static_protections, Ingo Molnar, (Mon Feb 11, 10:04 am)
[PATCH] [1/8] CPA: Remove my copyright notice, Andi Kleen, (Mon Feb 11, 5:50 am)
Re: [PATCH] [1/8] CPA: Remove my copyright notice, Thomas Gleixner, (Mon Feb 11, 8:42 pm)