linux-kernel - Re: [PATCH sched_ext/for-6.13] sched_ext: Do not enable LLC/NUMA optimizations when domains overlap

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Message-ID: <ZyrDTzVSQtNBcZ-x@slm.duckdns.org>
Date: Tue, 5 Nov 2024 15:15:59 -1000
From: Tejun Heo <tj@...nel.org>
To: Andrea Righi <arighi@...dia.com>
Cc: David Vernet <void@...ifault.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH sched_ext/for-6.13] sched_ext: Do not enable LLC/NUMA
 optimizations when domains overlap

Hello, Andrea.

On Wed, Nov 06, 2024 at 02:08:00AM +0100, Andrea Righi wrote:
...
> I think this is only possible in a virtualized environment, in this case
> LLC should be disabled and NUMA enabled. Maybe it's worth checking also
> for the case where LLC > NUMA...

I think the current code is okay. It just needs a short comment explaining
why it's so. A cleaner alternative may be walking the llc sd's and verify
whether any two llcs share the same node sd as an ancestor.

Thanks.

-- 
tejun