linux-kernel - Re: [PATCHSET v2 sched_ext/for-6.16] sched_ext: Introduce scx

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Message-ID: <aBEdZsyMu2kHg2_B@slm.duckdns.org>
Date: Tue, 29 Apr 2025 08:41:42 -1000
From: Tejun Heo <tj@...nel.org>
To: void@...ifault.com, arighi@...dia.com, multics69@...il.com
Cc: linux-kernel@...r.kernel.org, sched-ext@...a.com
Subject: Re: [PATCHSET v2 sched_ext/for-6.16] sched_ext: Introduce scx_sched

On Fri, Apr 25, 2025 at 11:58:15AM -1000, Tejun Heo wrote:
> v[1] -> v2:
> 
> - 0003-sched_ext-Use-dynamic-allocation-for-scx_sched.patch updated to store
>   scx_sched pointer in sched_ext_ops->priv so that bpf_scx_unreg() can
>   determine the scx_sched to destroy regardless of where initialization
>   failed. This will also help with supporting multiple schedulers.
> 
> - Minor updates to 0010-sched_ext-Move-event_stats_cpu-into-scx_sched.patch.
> 
> In preparation of supporting multiple hierarchical schedulers, this patchset
> packages the states which are currently global but need to become per
> scheduler instance into the new struct scx_sched.
> 
> Currently, the only supported scheduler instance is the system-wide root one
> (scx_root) and the code assumes scx_root in many places. A follow-up
> patchset will introduce multiple scheduler support scrutinizing and updating
> each such occurrence appropriately.
> 
> There's significant amount of churning but most changes are straightforward
> if not trivial, and no user visible changes are expected.
> 
>  0001-sched_ext-Introduce-scx_sched.patch
>  0002-sched_ext-Avoid-NULL-scx_root-deref-through-SCX_HAS_.patch
>  0003-sched_ext-Use-dynamic-allocation-for-scx_sched.patch
>  0004-sched_ext-Inline-create_dsq-into-scx_bpf_create_dsq.patch
>  0005-sched_ext-Factor-out-scx_alloc_and_add_sched.patch
>  0006-sched_ext-Move-dsq_hash-into-scx_sched.patch
>  0007-sched_ext-Move-global_dsqs-into-scx_sched.patch
>  0008-sched_ext-Relocate-scx_event_stats-definition.patch
>  0009-sched_ext-Factor-out-scx_read_events.patch
>  0010-sched_ext-Move-event_stats_cpu-into-scx_sched.patch
>  0011-sched_ext-Move-disable-machinery-into-scx_sched.patch
>  0012-sched_ext-Clean-up-SCX_EXIT_NONE-handling-in-scx_dis.patch

Applied to sched_ext/for-6.16.

Thanks.

-- 
tejun