linux-kernel - Re: [PATCH v4] kvm: Fix page ageing bugs

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Date:	Tue, 23 Sep 2014 19:05:21 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Andres Lagar-Cavilla <andreslc@...gle.com>
CC:	Gleb Natapov <gleb@...nel.org>, Radim Krcmar <rkrcmar@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Peter Feiner <pfeiner@...gle.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andres Lagar-Cavilla <andreslc@...ogle.com>
Subject: Re: [PATCH v4] kvm: Fix page ageing bugs

Il 23/09/2014 19:04, Andres Lagar-Cavilla ha scritto:
> I'm not sure. The addition is not always by PAGE_SIZE, since it
> depends on the current level we are iterating at in the outer
> kvm_handle_hva_range(). IOW, could be PMD_SIZE or even PUD_SIZE, and
> is_large_pte() enough to tell?
> 
> This is probably worth a general fix, I can see all the callbacks
> benefiting from knowing the gfn (passed down by
> kvm_handle_hva_range()) without any additional computation, and adding
> that to a tracing call if they don't already.
> 
> Even passing the level down to the callback would help by cutting down
> to one arithmetic op (subtract rmapp from slot rmap base pointer for
> that level)

You're right.  Let's apply this patch and work on that as a follow-up.

Paolo
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