Re: [PATCH] mm: Mark idle page tracking as BROKEN

[Vlastimil Babka <vbabka@suse.cz>]

On 6/16/21 8:22 AM, Yu Zhao wrote:
> On Tue, Jun 15, 2021 at 8:55 PM Matthew Wilcox <willy@infradead.org> wrote:
>>
>>
>> I don't know.  I asked the others on the call and the answer I got was
>> essentially "Just delete it".
>>
>> I'm kind of hoping the others speak up.
> 
> I listed a couple of things when acking this patch. Being broken is
> not a problem as long as there are users who care about it. What made
> me think such users may not exist is that nobody ever complained about
> those things until we stumbled on them -- I'm not insisting on
> deleting this feature, just clarifying why I thought so.

Similar feelings here. On the call it looked like the feature was abandoned by
its creators, and it wasn't clear if the distros that had it enabled did so due
to reasons that still apply for future versions. Sending the proposal and
getting a feedback that there are users is one of the expected valid outcomes.

> The real question is how well we want to support it. My understanding,
> based on the previous discussion, is "as-is". That is we simply follow
> the current "semantics" when converting it to using folios.
>