Re: [RFC PATCH v2 0/4] mm: compaction: mTHP-friendly memory compaction

[Bo Zhang]

On 10/21/26 11:31, Vlastimil Babka (SUSE) wrote:
> I'm not going to answer your LLM's questions for you.

Sorry for the previous mail, which polished my English by AI.
Let me put it in my own words.

Last mail you advised me to use cc->order to pass the target order,
however /proc/sys/vm/compact_memory and kcompactd work could
only be distinguished by order. Because in both cases the variable
direct_compaction and proactive_compaction are false.

Without adding new members to compact_control, it's impossible
to use the bool instead of is_via_compact_memory to achieve the 
same goal (Or maybe I missed something)

For skip_isolation_on_order, I want the new logic to take effect:
with a real order it will skip folios already >= the target order.
This is what patch 3 does.

I will keep the original behaviour for fast_isolate_freepages,
suitable_migration_target and compact_zone functions. I will use
the bool variables to express the same logic.

But in compact_zone, should we exit the compaction when the order
is already satisfied by the watermark? That is I want to discuss.

Thanks
Bo