Re: Swap Min Odrer

[David Hildenbrand <david@redhat.com>]

On 08.01.25 22:19, Chris Li wrote:
> On Wed, Jan 8, 2025 at 12:36 PM David Hildenbrand <david@redhat.com> wrote:
>>
>>>> Maybe the swapcache could somehow abstract that? We currently have the swap
>>>> slot allocator, that assigns slots to pages.
>>>>
>>>> Assuming we have a 16 KiB BS but a 4 KiB page, we might have various options
>>>> to explore.
>>>>
>>>> For example, we could size swap slots 16 KiB, and assign even 4 KiB pages a
>>>> single slot. This would waste swap space with small folios, that would go
>>>> away with large folios.
>>>
>>> So batching order-0 folios in bigger slots that match the FS BS (e.g. 16
>>> KiB) to perform disk writes, right?
>>
>> Batching might be one idea, but the first idea I raised here would be
>> that the swap slot size will match the BS (e.g., 16 KiB) and contain at
>> most one folio.
>>
>> So a order-0 folio would get a single slot assigned and effectively
>> "waste" 12 KiB of disk space.
> 
> I prefer not to "waste" that. It will be wasted on the write
> amplification as well.

If it can be implemented fairly easily, sure! :)

Looking forward to hearing about the proposal!
-- 
Cheers,

David / dhildenb