Message-ID: <1435802395.6887.20.camel@gmail.com>
Subject: Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods
 encouraging normal ones
From: Mike Galbraith <umgwanakikbuti@gmail.com>
To: josh@joshtriplett.org
Cc: paulmck@linux.vnet.ibm.com, Peter Zijlstra <peterz@infradead.org>,
        linux-kernel@vger.kernel.org, mingo@kernel.org, laijs@cn.fujitsu.com,
        dipankar@in.ibm.com, akpm@linux-foundation.org,
        mathieu.desnoyers@efficios.com, tglx@linutronix.de,
        rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
        dvhart@linux.intel.com, fweisbec@gmail.com, oleg@redhat.com,
        bobby.prani@gmail.com
Date: Thu, 02 Jul 2015 03:59:55 +0200
In-Reply-To: <20150702013426.GB19350@cloud>
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	 <20150701140031.GB3717@linux.vnet.ibm.com>
	 <20150701141710.GG25159@twins.programming.kicks-ass.net>
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On Wed, 2015-07-01 at 18:34 -0700, josh@joshtriplett.org wrote:
> On Thu, Jul 02, 2015 at 03:11:24AM +0200, Mike Galbraith wrote:
> > On Wed, 2015-07-01 at 09:17 -0700, Paul E. McKenney wrote:
> > > On Wed, Jul 01, 2015 at 04:17:10PM +0200, Peter Zijlstra wrote:
> > > > On Wed, Jul 01, 2015 at 07:00:31AM -0700, Paul E. McKenney wrote:
> > > > 
> > > > > That is a bit extreme, Peter.
> > > > 
> > > > Of course; but I'm really not seeing people taking due care with them
> > > 
> > > ;-)
> > > 
> > > > > Are a huge pile of them coming in this merge window or something?
> > > > > What raised your concerns on this issue?
> > > > 
> > > > This is complete horse manure (breaking the nvidiot binary blob is a
> > > > good thing):
> > > > 
> > > > 74b51ee152b6 ("ACPI / osl: speedup grace period in acpi_os_map_cleanup")
> > > 
> > > Really???
> > > 
> > > I am not concerned about this one.  After all, one of the first things
> > > that people do for OS-jitter-sensitive workloads is to get rid of
> > > binary blobs.
> > 
> > I know two users who have no choice but to use the nvidia driver with
> > their realtime applications, as nouveau is not up to the task.
> 
> Sounds like they have a relatively loose definition of "realtime", then.

It would be better it they broke their beasts up into a bunch of small
synchronized boxen, but they use big boxen here and now, with realtime
rendering being a non-disposable portion of the load.

	-Mike

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