linux-kernel - Re: [FOR-STABLE-3.9+] sched/rt: Show the 'sched_rr_timeslice' SCHED

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Message-ID: <20200703074354.btmylgn5mxhbxywc@vireshk-i7>
Date:   Fri, 3 Jul 2020 13:13:54 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [FOR-STABLE-3.9+] sched/rt: Show the 'sched_rr_timeslice'
 SCHED_RR timeslice tuning knob in milliseconds

On 03-07-20, 09:40, Greg KH wrote:
> On Fri, Jul 03, 2020 at 12:54:04PM +0530, Viresh Kumar wrote:
> > From: Shile Zhang <shile.zhang@...ia.com>
> > 
> > We added the 'sched_rr_timeslice_ms' SCHED_RR tuning knob in this commit:
> > 
> >   ce0dbbbb30ae ("sched/rt: Add a tuning knob to allow changing SCHED_RR timeslice")
> > 
> > ... which name suggests to users that it's in milliseconds, while in reality
> > it's being set in milliseconds but the result is shown in jiffies.
> > 
> > This is obviously confusing when HZ is not 1000, it makes it appear like the
> > value set failed, such as HZ=100:
> > 
> >   root# echo 100 > /proc/sys/kernel/sched_rr_timeslice_ms
> >   root# cat /proc/sys/kernel/sched_rr_timeslice_ms
> >   10
> > 
> > Fix this to be milliseconds all around.
> > 
> > Cc: <stable@...r.kernel.org> # v3.9+
> > Signed-off-by: Shile Zhang <shile.zhang@...ia.com>
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> > Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> > Cc: Mike Galbraith <efault@....de>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Link: http://lkml.kernel.org/r/1485612049-20923-1-git-send-email-shile.zhang@nokia.com
> > Signed-off-by: Ingo Molnar <mingo@...nel.org>
> > Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> 
> What is the git commit id of this patch in Linus's tree?

I am really sorry for missing the only thing I was required to do :(

commit 975e155ed8732cb81f55c021c441ae662dd040b5 upstream.

-- 
viresh