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From: Rich Felker <dalias@libc.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-sh@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH v7 2/2] clocksource: add J-Core timer/clocksource driver
Date: Tue, 4 Oct 2016 16:58:37 -0400	[thread overview]
Message-ID: <20161004205837.GC19318@brightrain.aerifal.cx> (raw)
In-Reply-To: <20161004070623.GM14933@linux.vnet.ibm.com>

On Tue, Oct 04, 2016 at 12:06:23AM -0700, Paul E. McKenney wrote:
> On Mon, Oct 03, 2016 at 06:10:39PM -0400, Rich Felker wrote:
> > On Mon, Sep 26, 2016 at 11:27:14PM +0200, Daniel Lezcano wrote:
> > > On 26/09/2016 23:07, Rich Felker wrote:
> > > > Ping. Is there anything that still needs to be changed for this driver
> > > > to be acceptable?
> > > 
> > > It is on my radar. I'm reviewing it.
> > > 
> > > Can you elaborate the workaround mentioned in the changelog. I have been
> > > digging into the lkml@ thread but it is not clear if the issue is
> > > related to the time framework, the driver itself or whatever else. Can
> > > you clarify that ?
> > 
> > Do you have comments on any remaining issues other than this
> > workaround? If not I don't mind removing the workaround and trying to
> > solve the issue separately later. Let me know and either way I'll
> > submit a v8.
> 
> One question of interest to me is whether this patchset prevents the
> RCU CPU stall warnings that you are seeing.

With the 5ms minimum delta, I didn't observe any rcu_sched stall
warnings. At 2.5ms I thought it was gone but eventually saw one. With
the previous mindelta = 1, i.e. 1 hardware bus period, I get the
stalls regularly.

Rich

  reply	other threads:[~2016-10-04 20:58 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-24  5:07 [PATCH v7 0/2] J-Core timer support Rich Felker
2016-09-24  5:07 ` [PATCH v7 2/2] clocksource: add J-Core timer/clocksource driver Rich Felker
2016-09-26 21:07   ` Rich Felker
2016-09-26 21:27     ` Daniel Lezcano
2016-09-26 22:23       ` Rich Felker
2016-09-26 23:55         ` Thomas Gleixner
2016-09-27  0:42           ` Rich Felker
2016-09-27 22:08             ` Rich Felker
2016-09-30 13:15               ` Thomas Gleixner
2016-09-30 13:48                 ` Paul E. McKenney
2016-10-01 17:05                   ` Rich Felker
2016-10-01 17:58                     ` Paul E. McKenney
2016-10-02  0:00                       ` Rich Felker
2016-10-02  3:59                         ` Rich Felker
2016-10-02  5:59                           ` Paul E. McKenney
2016-10-02  6:30                         ` Paul E. McKenney
2016-10-08  1:32                 ` Rich Felker
2016-10-08 11:32                   ` Thomas Gleixner
2016-10-08 16:26                     ` Rich Felker
2016-10-08 17:03                       ` Thomas Gleixner
2016-10-09  1:28                         ` Rich Felker
2016-10-09  9:14                           ` Thomas Gleixner
2016-10-09 14:35                             ` Rich Felker
2016-10-03 22:10       ` Rich Felker
2016-10-04  7:06         ` Paul E. McKenney
2016-10-04 20:58           ` Rich Felker [this message]
2016-10-04 21:14             ` Paul E. McKenney
2016-10-04 21:48               ` Rich Felker
2016-10-05 12:41                 ` Paul E. McKenney
2016-09-24  5:07 ` [PATCH v7 1/2] of: add J-Core timer bindings Rich Felker

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