Message-ID: <1435805445.6887.50.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: paulmck@linux.vnet.ibm.com
Cc: josh@joshtriplett.org, 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 04:50:45 +0200
In-Reply-To: <20150702021838.GA3717@linux.vnet.ibm.com>
References: <20150630221224.GQ3717@linux.vnet.ibm.com>
	 <20150630234633.GA11450@cloud>
	 <20150701100939.GR19282@twins.programming.kicks-ass.net>
	 <20150701105511.GN18673@twins.programming.kicks-ass.net>
	 <20150701140031.GB3717@linux.vnet.ibm.com>
	 <20150701141710.GG25159@twins.programming.kicks-ass.net>
	 <20150701161705.GK3717@linux.vnet.ibm.com>
	 <1435799484.3482.15.camel@gmail.com> <20150702013426.GB19350@cloud>
	 <1435802395.6887.20.camel@gmail.com>
	 <20150702021838.GA3717@linux.vnet.ibm.com>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 865
Lines: 20

On Wed, 2015-07-01 at 19:18 -0700, Paul E. McKenney wrote:

> Does their normal workload trigger the condition that results in the
> expedited grace period?  If so, do they use NO_HZ_FULL?

They're having no trouble that I'm aware of, and I definitely would be
made aware.  They're not currently using a kernel with NO_HZ_FULL even
built in, as that stuff is far far too raw in the current kernel.

They may meet a NO_HZ_FULL enabled kernel soonish, but will be told to
not turn it on for anything other than pure compute, as NO_HZ_FULL is
currently not usable for mixed load in partitioned box, much less rt. 

	-Mike

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/