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Re: [PATCH 1/3] x86/mm: Drop duplicate l1_disallow_mask() calls
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 18 Jul 2024 11:25:13 +0200
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 18 Jul 2024 09:25:32 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 17.07.2024 18:14, Andrew Cooper wrote:
> Even in release builds, gdprintk() evalues its parameters for side effects,
> and l1_disallow_mask() is full of them.
>
> Calculate the disallow mask once and reuse the variable. This improves code
> generation in release builds:
>
> add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-207 (-207)
> Function old new delta
> mod_l1_entry 1947 1860 -87
> get_page_from_l1e 1391 1271 -120
>
> Also, render the bad flags message with a 0x prefix.
>
> No practical change.
>
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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