[Bug 2059316] Re: backport arm64 THP improvements from 6.9

I'm including these patches as a part of LP: #2111859, so am marking
this bug as fix committed for noble:linux-gcp.

** Also affects: linux-gcp (Ubuntu)
Importance: Undecided
Status: New

** Changed in: linux-gcp (Ubuntu Noble)
Status: New => Fix Committed

--
You received this bug notification because you are subscribed to linux
in Ubuntu.
Matching subscriptions: Bgg, Bmail, Nb
https://bugs.launchpad.net/bugs/2059316

Title:
backport arm64 THP improvements from 6.9

Status in linux package in Ubuntu:
In Progress
Status in linux-gcp package in Ubuntu:
New
Status in linux-nvidia package in Ubuntu:
New
Status in linux source package in Noble:
New
Status in linux-gcp source package in Noble:
Fix Committed
Status in linux-nvidia source package in Noble:
Fix Released

Bug description:
Initial support for multi-size THP landed upstream in v6.8. In the 6.9
merge window, 2 other series have landed that show significant
performance improvements on arm64

mm/memory: optimize fork() with PTE-mapped THP
  https://lkml.iu.edu/hypermail/linux/kernel/2401.3/02766.html

Transparent Contiguous PTEs for User Mappings:
 https://lwn.net/Articles/962330/

On an Ampere AltraMax system w/ 4K page size, kernel builds in a tmpfs
are reduced from 6m30s to 5m17s, a ~19% improvement.

It has been reported that this can have a *10x* improvement for
certain GPU workloads on ARM:

https://lwn.net/Articles/954094/

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2059316/+subscriptions