Re: [PATCH 1/1] iomap: avoid compaction for costly folio order allocation

[Salvatore Dipietro]

On Wed, Jun 24, 2026 at 12:21:00PM +0000, Ritesh Harjani wrote:
> Sorry about the delay. I did bring this topic up in one of our internal
> ext4 community calls. And to share some context, MM community thinks we
> need a better long term fix for this problem rather than patching call
> sites and/or playing tricks like - 

Thanks Ritesh for the update and for bringing this to the wider MM community. 
I completely understand that the MM community is looking for a proper long-term
fix rather than specific patching.


On Wed, Jun 24, 2026 at 13:34:00PM +0000, Christoph Hellwig wrote:
> Do you have ointers to the patches for each approach above?

Yes — all the patches in the result table are shared within this thread:

v1 (original, iomap caller): The original PATCH 1/1 in this series
Ritesh's suggestion (mm/filemap.c): Shared in Ritesh's reply on May 3rd [1]
Matthew's suggestion (mm/filemap.c): Shared in Matthew's reply on April 4th [2]
kcompactd background (mm/page_alloc.c): Shared in my reply on May 6th [3]

[1] https://lore.kernel.org/all/20260403193535.9970-1-dipiets@xxxxxxxxx/T/#m8c3da1c9fb9e9c66d4e8b1849de824b0ecf37f9e
[2] https://lore.kernel.org/all/20260403193535.9970-1-dipiets@xxxxxxxxx/T/#m4b90cf280ff0efcf178dfd8d068f1de3b262e28a
[3] https://lore.kernel.org/all/20260403193535.9970-1-dipiets@xxxxxxxxx/T/#m22977355535a4599084a51104a4df806d49c53d1

--
Salvatore



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