linux-kernel - Re: [PATCH 1/3] sched/wait: use freezable

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Date:   Thu, 7 Feb 2019 10:05:37 -0500
From:   Joel Fernandes <joel@...lfernandes.org>
To:     Hugo Lefeuvre <hle@....eu.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Greg Hartman <ghartman@...gle.com>,
        Alistair Strachan <astrachan@...gle.com>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Christian Brauner <christian@...uner.io>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] sched/wait: use freezable_schedule when possible

On Thu, Feb 07, 2019 at 12:30:50AM +0100, Hugo Lefeuvre wrote:
> Hi Joel,
> 
> > I'm curious did you try the freezing process and see if pointless wakeups are
> > reduced?  That would be an added bonus if you did.
> 
> I'm currently testing these changes. I hope to be able to come back with
> more concrete results soon.
> 
> Also, I just noticed that the third patch removes a necessary #include
> <linux/freezer.h>. I will submit an updated version tomorrow.
> 
> Thanks for the review!

Sure, add these test results to the patch as well showing reduced wakeups.

I would say submit the freezable_schedule as a single separate patch
independent of the vsoc series since it can go in separately, and also
benefits other things than vsoc.

Also CC Rafael (power maintainer) on it.

Thank you!

 - Joel