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From: John Garry <john.garry@huawei.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Marc Zyngier" <maz@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	Daniel Bristot de Oliveira <bristot@redhat.com>,
	"Ingo Molnar" <mingo@kernel.org>
Subject: Re: Question on threaded handlers for managed interrupts
Date: Fri, 23 Apr 2021 16:00:47 +0100	[thread overview]
Message-ID: <e260dfb0-95c5-778e-2652-f563784cb984@huawei.com> (raw)
In-Reply-To: <871rb1w3x8.ffs@nanos.tec.linutronix.de>

Hi Thomas,

On 23/04/2021 14:01, Thomas Gleixner wrote:
> On Fri, Apr 23 2021 at 12:50, Thomas Gleixner wrote:
>> On Thu, Apr 22 2021 at 17:10, John Garry wrote:
>> OTOH, the way how you splitted the handling into hard/thread context
>> provides already the base for this.
>>
>> The missing piece is infrastructure at the irq/scheduler core level to
>> handle this transparently.
>>
>> I have some horrible ideas how to solve that, but I'm sure the scheduler
>> wizards can come up with a reasonable and generic solution.
> So one thing I forgot to ask is:
> 
> Is the thread simply stuck in the while() loop forever or is
> this just an endless hardirq/thread/hardirq/thread stream?

The thread will process all available completions and then return. I 
added some debug there, and at most we handle maybe max 150-300 
completions per thread run.

So I figure that we have the endless hardirq/thread/hardirq/thread stream.

Thanks,
John


  reply	other threads:[~2021-04-23 15:03 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-22 16:10 Question on threaded handlers for managed interrupts John Garry
2021-04-23 10:50 ` Thomas Gleixner
2021-04-23 12:02   ` John Garry
2021-04-23 13:01   ` Thomas Gleixner
2021-04-23 15:00     ` John Garry [this message]
2021-05-21 12:46     ` John Garry

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