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Re: [PATCH] Arm64: make setup_virt_paging()'s pa_range_info[] static
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 30 Nov 2022 08:13:53 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 30 Nov 2022 07:14:08 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 29.11.2022 17:01, Julien Grall wrote:
> On 29/11/2022 15:39, Jan Beulich wrote:
>> While not as inefficient as it would be on x86 (due to suitable constant
>> loading and register pair storing instructions being available to fill
>> some of the fields), having the compiler construct an array of constants
>> on the stack still looks odd to me.
>
> The function is only called once at boot. So this seems more a
> micro-optimization than anything else.
Well, yes - hence the "looks odd" as a justification, not performance or
anything.
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>
> Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
Thanks.
>> ---
>> Actual space savings could be had if further converting the field types
>> to e.g. unsigned char (all of the values fit in that type).
>
> This is a micro-optimization. If you want to send it then I will review it.
I probably won't bother; I've pointed this out largely in case actual
space savings would be made a requirement to accept this change.
Jan
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