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From: Andi Kleen <ak@suse.de>
To: Arjan van de Ven <arjan@infradead.org>
Cc: tglx@linutronix.de, mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [7/8] CPA: Don't flush caches on CPUs that support self-snoop
Date: Mon, 11 Feb 2008 16:27:23 +0100	[thread overview]
Message-ID: <200802111627.23751.ak@suse.de> (raw)
In-Reply-To: <20080211072109.029bb6c5@laptopd505.fenrus.org>


> > That is exactly the situation in pageattr.c. You're saying the manual
> > is wrong here?
> 
> I'm saying that we are not following step 2 (marking the pages not present) 

Yes that's true. It's one of the design problems of the intent API that makes
fixing this hard unfortunately.

(intent API assumes that the caller doesn't fully own the page to change, and
if you can't control it 100% it is not possible to unmap it temporarily) 

> so 3 and 4 
> aren't all too relevant. As I said before I've asked internally about this and got
> mixed answers so I'm still chasing it down.

Ok.

-Andi



  reply	other threads:[~2008-02-11 15:27 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-11  9:50 [PATCH] [0/8] Misc CPA patchkit Andi Kleen
2008-02-11  9:50 ` [PATCH] [1/8] CPA: Remove my copyright notice Andi Kleen
2008-02-12  0:42   ` Thomas Gleixner
2008-02-11  9:50 ` [PATCH] [2/8] CPA: Remove inline from static_protections Andi Kleen
2008-02-11 14:04   ` Ingo Molnar
2008-02-11  9:50 ` [PATCH] [3/8] CPA: Fix some incorrect comments in the debug pagealloc code Andi Kleen
2008-02-11  9:50 ` [PATCH] [4/8] CPA: Ifdef the cpa pool for DEBUG_PAGEALLOC Andi Kleen
2008-02-11  9:50 ` [PATCH] [5/8] CPA: Move pool allocation/free into separate functions Andi Kleen
2008-02-11  9:50 ` [PATCH] [6/8] CPA: Remove BUG_ON for LRU/Compound pages Andi Kleen
2008-02-17 14:07   ` Thomas Gleixner
2008-02-11  9:50 ` [PATCH] [7/8] CPA: Don't flush caches on CPUs that support self-snoop Andi Kleen
2008-02-11 15:04   ` Arjan van de Ven
2008-02-11 15:12     ` Andi Kleen
2008-02-11 15:21       ` Arjan van de Ven
2008-02-11 15:27         ` Andi Kleen [this message]
2008-02-11 17:36           ` Siddha, Suresh B
2008-02-11 17:58             ` Andi Kleen
2008-02-11 19:47               ` Siddha, Suresh B
2008-02-11 20:36                 ` Arjan van de Ven
2008-02-12  8:45                   ` Andi Kleen
2008-02-11  9:50 ` [PATCH] [8/8] CPA: Add statistics about state of direct mapping Andi Kleen

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