Public bug reported:
This patch fixes a performance issue that has been present since v6.6 when
flushing a range of TLBs. Backport to 24.04-linux-nvidia and
24.04-linux-nvidia-6.11.
Fixes: 6bbd42e2df8f ("mmu_notifiers: call invalidate_range() when invalidating
TLBs")
Lore:
https://lore.kernel.org/all/20250304085127.2238030-1-pjaroszyn...@nvidia.com/
Linux-next:
https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=f7edb07ad7c6
This was found through the mmu_notifier_arch_invalidate_secondary_tlbs() call
site, which is exercised on boot for Grace-Hopper systems when the NVIDIA GPU
driver is loaded and the nvidia-persistenced service is enabled. Tested
backport by booting system with nvidia-persistenced enabled and
starting/stopping the daemon (which exercises the GPU memory hot add/remove
paths) and running I/O.
** Affects: linux-nvidia (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2102677
Title:
Backport: Fix mmu notifiers for range-based invalidates
Status in linux-nvidia package in Ubuntu:
New
Bug description:
This patch fixes a performance issue that has been present since v6.6 when
flushing a range of TLBs. Backport to 24.04-linux-nvidia and
24.04-linux-nvidia-6.11.
Fixes: 6bbd42e2df8f ("mmu_notifiers: call invalidate_range() when
invalidating TLBs")
Lore:
https://lore.kernel.org/all/20250304085127.2238030-1-pjaroszyn...@nvidia.com/
Linux-next:
https://web.git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=f7edb07ad7c6
This was found through the mmu_notifier_arch_invalidate_secondary_tlbs() call
site, which is exercised on boot for Grace-Hopper systems when the NVIDIA GPU
driver is loaded and the nvidia-persistenced service is enabled. Tested
backport by booting system with nvidia-persistenced enabled and
starting/stopping the daemon (which exercises the GPU memory hot add/remove
paths) and running I/O.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-nvidia/+bug/2102677/+subscriptions
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