Re: [PATCH v3] mm: page_alloc: make defrag_mode retries follow the promoted order

[Vlastimil Babka (SUSE)]

On 10/15/26 14:55, Kiryl Shutsemau wrote:
> On Thu, Oct 15, 2026 at 09:16:36AM +0200, Vlastimil Babka (SUSE) wrote:
>> > And agree 7.4-rc1 with CC stable is fine. Sadly, not sure if anyone
>> > but Meta is using the feature right now.
>> 
>> I thought it was there for a long time but it was only added in 2025 :) At
>> least the enterprise world is slow to adopt things, AFAICS.
> 
> I was thinking to propose a patch after merge window to make defrag_mode
> default. Do you think it is too early? I don't think it is ever going
> to be truly stabilized without wider exposure.

We can try it, but preferably with arguments (and best, numbers).

> We also discussed with Johannes to make a stricter (defrag_mode=2?) mode
> that will not give up on fragmentation ever, but OOM instead.

Would you use that mode at Meta? That however most likely wouldn't be
general purpose enough to become default.