Re: [PATCH v6 0/4] sched/fair: Improve scan efficiency of SIS

[Abel Wu]

Ping :)

On 10/19/22 8:28 PM, Abel Wu wrote:
> This patchset tries to improve SIS scan efficiency by recording idle
> cpus in a cpumask for each LLC which will be used as a target cpuset
> in the domain scan. The cpus are recorded at CORE granule to avoid
> tasks being stack on same core.
>
> v5 -> v6:
>   - Rename SIS_FILTER to SIS_CORE as it can only be activated when
>     SMT is enabled and better describes the behavior of CORE granule
>     update & load delivery.
>   - Removed the part of limited scan for idle cores since it might be
>     better to open another thread to discuss the strategies such as
>     limited or scaled depth. But keep the part of full scan for idle
>     cores when LLC is overloaded because SIS_CORE can greatly reduce
>     the overhead of full scan in such case.
>   - Removed the state of sd_is_busy which indicates an LLC is fully
>     busy and we can safely skip the SIS domain scan. I would prefer
>     leave this to SIS_UTIL.
>   - The filter generation mechanism is replaced by in-place updates
>     during domain scan to better deal with partial scan failures.
>   - Collect Reviewed-bys from Tim Chen
>
> ...