From: Vlastimil Babka <vbabka@suse.cz>
To: Frederic Weisbecker <frederic@kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
Michal Hocko <mhocko@kernel.org>, Oleg Nesterov <oleg@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Valentin Schneider <vschneid@redhat.com>,
linux-mm@kvack.org
Subject: Re: [PATCH 5/6] sched/isolation: Introduce isolated task work
Date: Thu, 17 Jul 2025 19:29:05 +0200 [thread overview]
Message-ID: <8c567101-8b6c-41aa-a684-cf05f1d3fcb7@suse.cz> (raw)
In-Reply-To: <20250703140717.25703-6-frederic@kernel.org>
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@kernel.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?
next prev parent reply other threads:[~2025-07-17 17:29 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-07-03 14:07 [PATCH 0/6 v4] sched/mm: LRU drain flush on nohz_full Frederic Weisbecker
2025-07-03 14:07 ` [PATCH 1/6] task_work: Provide means to check if a work is queued Frederic Weisbecker
2025-07-03 14:07 ` [PATCH 2/6] sched/fair: Use task_work_queued() on numa_work Frederic Weisbecker
2025-07-03 14:07 ` [PATCH 3/6] sched: Use task_work_queued() on cid_work Frederic Weisbecker
2025-07-17 16:32 ` Valentin Schneider
2025-07-03 14:07 ` [PATCH 4/6] tick/nohz: Move nohz_full related fields out of hot task struct's places Frederic Weisbecker
2025-07-17 16:32 ` Valentin Schneider
2025-07-03 14:07 ` [PATCH 5/6] sched/isolation: Introduce isolated task work Frederic Weisbecker
2025-07-17 17:29 ` Vlastimil Babka [this message]
2025-07-18 9:52 ` Valentin Schneider
2025-07-18 14:23 ` Frederic Weisbecker
2025-07-03 14:07 ` [PATCH 6/6] mm: Drain LRUs upon resume to userspace on nohz_full CPUs Frederic Weisbecker
2025-07-03 14:24 ` Michal Hocko
2025-07-03 14:28 ` Matthew Wilcox
2025-07-03 16:12 ` Michal Hocko
2025-07-17 19:33 ` Vlastimil Babka
-- strict thread matches above, loose matches on Subject: below --
2025-04-10 15:23 [PATCH 0/6 v3] sched/mm: LRU drain flush on nohz_full Frederic Weisbecker
2025-04-10 15:23 ` [PATCH 5/6] sched/isolation: Introduce isolated task work Frederic Weisbecker
2025-04-11 10:25 ` Oleg Nesterov
2025-04-11 22:00 ` Frederic Weisbecker
2025-04-12 5:12 ` K Prateek Nayak
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