linux-kernel - Re: [PATCH v7 3/3] sched/fair: Allocate both cfs_tg

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Message-ID: <CADsDNuUaOUWgTjXSyZhekSq=LOFA4yU2NeXvXMudK3iL4f0MRA@mail.gmail.com>
Date: Tue, 20 Jan 2026 14:11:13 -0500
From: Zecheng Li <zli94@...u.edu>
To: K Prateek Nayak <kprateek.nayak@....com>
Cc: Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, 
	Juri Lelli <juri.lelli@...hat.com>, Vincent Guittot <vincent.guittot@...aro.org>, 
	Dietmar Eggemann <dietmar.eggemann@....com>, Steven Rostedt <rostedt@...dmis.org>, 
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Valentin Schneider <vschneid@...hat.com>, Rik van Riel <riel@...riel.com>, Chris Mason <clm@...com>, 
	Madadi Vineeth Reddy <vineethr@...ux.ibm.com>, Xu Liu <xliuprof@...gle.com>, 
	Blake Jones <blakejones@...gle.com>, Josh Don <joshdon@...gle.com>, 
	Nilay Vaish <nilayvaish@...gle.com>, linux-kernel@...r.kernel.org, 
	Zecheng Li <zecheng@...gle.com>
Subject: Re: [PATCH v7 3/3] sched/fair: Allocate both cfs_tg_state with percpu allocator

Hi Prateek,

On Mon, Jan 19, 2026 at 2:17 AM K Prateek Nayak <kprateek.nayak@....com> wrote:
>
> Can we also optimize the CONFIG_RT_GROUP_SCHED stuff in the same way
> although I'm assuming the benefit is far less since they aren't
> accessed as frequently as the cfs bits. Something like:
> ...

Thanks for the review. For patch 1 and 2, I'll fix those in v8.

For the RT structs optimization, I agree this would be a nice
improvement for consistency. I'd like to propose handling it as a
follow-up series after this CFS series. I don't currently have a good
test environment for RT workloads to validate performance impact.

Thanks,
Zecheng