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Re: [Xen-devel] [PATCH v2 01/55] x86/mm: defer clearing page in virt_to_xen_lXe

To: Hongyan Xia <hongyax@xxxxxxxxxx>
From: Wei Liu <wl@xxxxxxx>
Date: Mon, 30 Sep 2019 16:05:02 +0100
Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Delivery-date: Mon, 30 Sep 2019 15:05:07 +0000
List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

On Mon, Sep 30, 2019 at 11:32:53AM +0100, Hongyan Xia wrote:
> From: Wei Liu <wei.liu2@xxxxxxxxxx>
> 
> Defer the call to clear_page to the point when we're sure the page is
> going to become a page table.
> 
> This is a minor optimisation. No functional change.
> 
> Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>

The benefit of this patch was questionable, because it made the lock
held longer. I had decided to drop it.

Wei.

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References:
- [Xen-devel] [PATCH v2 00/55] Switch to domheap for Xen PTEs
  - From: Hongyan Xia
- [Xen-devel] [PATCH v2 01/55] x86/mm: defer clearing page in virt_to_xen_lXe
  - From: Hongyan Xia

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