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Re: [PATCH 2/2] xen: Add CONFIG_GC_SECTIONS
- To: Jason Andryuk <jason.andryuk@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 11 Dec 2025 09:20:37 +0100
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- Cc: Victor Lira <victorm.lira@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Timothy Pearson <tpearson@xxxxxxxxxxxxxxxxxxxxx>, Alistair Francis <alistair.francis@xxxxxxx>, Bob Eshleman <bobbyeshleman@xxxxxxxxx>, Connor Davis <connojdavis@xxxxxxxxx>, Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>, Grygorii Strashko <grygorii_strashko@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 11 Dec 2025 08:20:58 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.12.2025 17:57, Jason Andryuk wrote:
> On 2025-12-10 03:17, Jan Beulich wrote:
>> On 09.12.2025 22:47, Jason Andryuk wrote:
>>> --- a/xen/common/Kconfig
>>> +++ b/xen/common/Kconfig
>>> @@ -680,4 +680,13 @@ config PM_STATS
>>> Enable collection of performance management statistics to aid in
>>> analyzing and tuning power/performance characteristics of the system
>>>
>>> +config GC_SECTIONS
>>> + bool "Garbage Collect Sections"
>>> + select CC_SPLIT_SECTIONS
>>> + help
>>> + During final linking, garbage collect unused sections. This will
>>> + reduce the size of the final Xen binary
>>> +
>>> + Only supported for ELF/Multiboot xen/xen.gz, not EFI xen.efi.
>>
>> This last sentence is x86-centric, which it shouldn't be here (or it should
>> say that this is an x86-only aspect).
>>
>> I also wonder whether this wouldn't better live next to CC_SPLIT_SECTIONS.
>
> If I put it immediately after CC_SPLIT_SECTIONS, menuconfig puts it as a
> top level option:
>
> │ │ [*] Garbage Collect Sections
> │ │ Architecture Features --->
> │ │ Common Features --->
>
> I thought Common Features was a better place for it.
Oh, right. I didn't recall CC_SPLIT_SECTIONS wouldn't even have a prompt. I
wonder if it shouldn't gain one, move somewhere here, and then this new
option could be placed next to it.
> Also, I think it should probably gain " if EXPERT" as well.
Not sure there. If this works reliably, I don't see why it would take an
expert to enable. Eventually, after all, this may want to be the default.
Jan
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