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From: Josh Triplett <josh@joshtriplett.org>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
	laijs@cn.fujitsu.com, dipankar@in.ibm.com,
	akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
	niv@us.ibm.com, tglx@linutronix.de, peterz@infradead.org,
	rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com,
	darren@dvhart.com, fweisbec@gmail.com, sbw@mit.edu
Subject: Re: [PATCH RFC nohz_full v2 2/7] nohz_full: Add rcu_dyntick data for scalable detection of all-idle state
Date: Mon, 1 Jul 2013 08:31:50 -0700	[thread overview]
Message-ID: <20130701153150.GB2923@leaf> (raw)
In-Reply-To: <1372450222-19420-2-git-send-email-paulmck@linux.vnet.ibm.com>

On Fri, Jun 28, 2013 at 01:10:17PM -0700, Paul E. McKenney wrote:
> From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
> 
> This commit adds fields to the rcu_dyntick structure that are used to
> detect idle CPUs.  These new fields differ from the existing ones in
> that the existing ones consider a CPU executing in user mode to be idle,
> where the new ones consider CPUs executing in user mode to be busy.

Can you explain, both in the commit messages and in the comments added
by the next commit, *why* this code doesn't consider userspace a
quiescent state?

- Josh Triplett

  reply	other threads:[~2013-07-01 15:32 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-06-28 20:09 [PATCH RFC nohz_full 0/7] v2 Provide infrastructure for full-system idle Paul E. McKenney
2013-06-28 20:10 ` [PATCH RFC nohz_full v2 1/7] nohz_full: Add Kconfig parameter for scalable detection of all-idle state Paul E. McKenney
2013-06-28 20:10   ` [PATCH RFC nohz_full v2 2/7] nohz_full: Add rcu_dyntick data " Paul E. McKenney
2013-07-01 15:31     ` Josh Triplett [this message]
2013-07-01 15:52       ` Paul E. McKenney
2013-07-01 18:16         ` Josh Triplett
2013-07-01 18:23           ` Paul E. McKenney
2013-07-01 18:34             ` Josh Triplett
2013-07-01 19:16               ` Paul E. McKenney
2013-07-02  5:10                 ` Mike Galbraith
2013-07-02  5:58                   ` Paul E. McKenney
2013-06-28 20:10   ` [PATCH RFC nohz_full v2 3/7] nohz_full: Add per-CPU idle-state tracking Paul E. McKenney
2013-07-01 15:33     ` Josh Triplett
2013-06-28 20:10   ` [PATCH RFC nohz_full v2 4/7] nohz_full: Add full-system idle states and variables Paul E. McKenney
2013-06-28 20:10   ` [PATCH RFC nohz_full v2 5/7] nohz_full: Add full-system-idle arguments to API Paul E. McKenney
2013-06-28 20:10   ` [PATCH RFC nohz_full v2 6/7] nohz_full: Add full-system-idle state machine Paul E. McKenney
2013-07-01 16:35     ` Frederic Weisbecker
2013-07-01 18:10       ` Paul E. McKenney
2013-07-01 20:55         ` Frederic Weisbecker
2013-07-01 16:53     ` Frederic Weisbecker
2013-07-01 18:17       ` Paul E. McKenney
2013-07-01 21:38     ` Frederic Weisbecker
2013-07-01 22:51       ` Paul E. McKenney
2013-06-28 20:10   ` [PATCH RFC nohz_full v2 7/7] nohz_full: Force RCU's grace-period kthreads onto timekeeping CPU Paul E. McKenney
2013-07-01 15:19 ` [PATCH RFC nohz_full 0/7] v2 Provide infrastructure for full-system idle Andi Kleen
2013-07-01 16:03   ` Paul E. McKenney
2013-07-01 16:19     ` Andi Kleen
2013-07-01 19:19       ` Paul E. McKenney
2013-07-01 19:43 ` Christoph Lameter
2013-07-01 19:56   ` Paul E. McKenney
2013-07-01 20:24     ` Christoph Lameter
2013-07-01 20:43       ` Thomas Gleixner

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