linux-kernel - Re: [PATCH 5/6] sched/isolation: Introduce isolated task work

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Message-ID: <8c567101-8b6c-41aa-a684-cf05f1d3fcb7@suse.cz>
Date: Thu, 17 Jul 2025 19:29:05 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: Frederic Weisbecker <frederic@...nel.org>,
 LKML <linux-kernel@...r.kernel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar
 <mingo@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
 Michal Hocko <mhocko@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>, Thomas Gleixner <tglx@...utronix.de>,
 Valentin Schneider <vschneid@...hat.com>, linux-mm@...ck.org
Subject: Re: [PATCH 5/6] sched/isolation: Introduce isolated task work

On 7/3/25 16:07, Frederic Weisbecker wrote:
> Some asynchronous kernel work may be pending upon resume to userspace
> and execute later on.On isolated workload this becomes problematic once
> the process is done with preparatory work involving syscalls and wants
> to run in userspace without being interrupted.
> 
> Provide an infrastructure to queue a work to be executed from the current
> isolated task context right before resuming to userspace. This goes with
> the assumption that isolated tasks are pinned to a single nohz_full CPU.
> 
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>

I'm wondering if this really needs a new config or we're being unnecessarily
defensive and the existing NO_HZ_FULL should be enough?