Re: [PATCH v2 0/8] Fix SCHED_DEADLINE bandwidth accounting during suspend

[Jon Hunter <jonathanh@nvidia.com>]

Hi Juri,

On 06/03/2025 14:10, Juri Lelli wrote:
> Hello!
> 
> Jon reported [1] a suspend regression on a Tegra board configured to
> boot with isolcpus and bisected it to commit 53916d5fd3c0
> ("sched/deadline: Check bandwidth overflow earlier for hotplug").
> 
> Root cause analysis pointed out that we are currently failing to
> correctly clear and restore bandwidth accounting on root domains after
> changes that initiate from partition_sched_domains(), as it is the case
> for suspend operations on that board.
> 
> This is v2 [2] of the proposed approach to fix the issue. With respect
> to v1, the following implements the approach by:
> 
> - 01: filter out DEADLINE special tasks
> - 02: preparatory wrappers to be able to grab sched_domains_mutex on
>        UP (remove !SMP wrappers - Waiman)
> - 03: generalize unique visiting of root domains so that we can
>        re-use the mechanism elsewhere
> - 04: the bulk of the approach, clean and rebuild after changes
> - 05: clean up a now redundant call
> - 06: remove partition_and_rebuild_sched_domains() (Waiman)
> - 07: stop exposing partition_sched_domains_locked (Waiman)
> 
> Please test and review. The set is also available at


Tested-by: Jon Hunter <jonathanh@nvidia.com>

Thanks!
Jon

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