linux-kernel - Re: [PATCH 1/3] clockevents: Retry programming min delta up to 10 times

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Message-ID: <alpine.DEB.2.20.1710191527570.1971@nanos>
Date:   Thu, 19 Oct 2017 15:29:28 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Matt Redfearn <matt.redfearn@...s.com>
cc:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        James Hogan <james.hogan@...s.com>, linux-mips@...ux-mips.org,
        James Hogan <jhogan@...nel.org>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] clockevents: Retry programming min delta up to 10
 times

On Thu, 19 Oct 2017, Matt Redfearn wrote:
> On 19/10/17 13:43, Thomas Gleixner wrote:
> > 	delta = 0;
> > 	for (i = 0; i < 10; i++) {
> > 		delta += dev->min_delta_ns;
> > 		dev->next_event = ktime_add_ns(ktime_get(), delta);
> > 		clc = .....
> > 	   	.....
> > 
> > That makes it more likely to succeed fast. Hmm?
> 
> That will set the target time to increasing multiples of min_delta_ns in the
> future, right?

Yes, but without fiddling with min_delta_ns itself.

> Sure, it should make it succeed faster - I'll make it like
> that. Are you OK with the arbitrarily chosen 10 retries?

I lost my crystalball so I have to trust yours :)

Thanks,

	tglx