From: Peter Zijlstra <peterz@infradead.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: LKML <linux-kernel@vger.kernel.org>, tglx@linutronix.de
Subject: Re: [PATCH] task_work: allow TWA_SIGNAL without a rescheduling IPI
Date: Thu, 28 Apr 2022 11:08:36 +0200 [thread overview]
Message-ID: <20220428090836.GQ2731@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <33a6de15-f487-b12b-8ffe-af978ebb03c3@kernel.dk>
On Mon, Apr 25, 2022 at 07:52:31PM -0600, Jens Axboe wrote:
> On 4/22/22 8:34 AM, Jens Axboe wrote:
> > Some use cases don't always need an IPI when sending a TWA_SIGNAL
> > notification. Add TWA_SIGNAL_NO_IPI, which is just like TWA_SIGNAL,
> > except it doesn't send an IPI to the target task. It merely sets
> > TIF_NOTIFY_SIGNAL and wakes up the task.
Could you perphaps elaborate on those use-cases? How do they guarantee
the task_work is ran before userspace?
next prev parent reply other threads:[~2022-04-28 9:12 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-22 14:34 [PATCH] task_work: allow TWA_SIGNAL without a rescheduling IPI Jens Axboe
2022-04-26 1:52 ` Jens Axboe
2022-04-28 9:08 ` Peter Zijlstra [this message]
2022-04-28 12:21 ` Jens Axboe
2022-04-28 22:28 ` Thomas Gleixner
2022-04-28 22:30 ` Jens Axboe
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