From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@efficios.com,
josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org,
dhowells@redhat.com, edumazet@google.com, dvhart@linux.intel.com,
fweisbec@gmail.com, oleg@redhat.com, bobby.prani@gmail.com
Subject: Re: [PATCH tip/core/rcu 24/24] rcu: Conditionally compile RCU's eqs warnings
Date: Wed, 13 May 2015 08:06:25 -0700 [thread overview]
Message-ID: <20150513150625.GF6776@linux.vnet.ibm.com> (raw)
In-Reply-To: <20150513094648.72e03399@gandalf.local.home>
On Wed, May 13, 2015 at 09:46:48AM -0400, Steven Rostedt wrote:
> On Tue, 12 May 2015 15:30:54 -0700
> "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
>
> > --- a/lib/Kconfig.debug
> > +++ b/lib/Kconfig.debug
> > @@ -1373,6 +1373,17 @@ config RCU_TRACE
> > Say Y here if you want to enable RCU tracing
> > Say N if you are unsure.
> >
> > +config RCU_EQS_DEBUG
> > + bool "Use this when adding any sort of NO_HZ support to your arch"
> > + depends on DEBUG_KERNEL
>
> Should we add "depends on NO_HZ" ?
No, because RCU now uses the EQS code even for NO_HZ_PERIODIC to detect
idle time.
Thanx, Paul
> -- Steve
>
> > + help
> > + This option provides consistency checks in RCU's handling of
> > + NO_HZ. These checks have proven quite helpful in detecting
> > + bugs in arch-specific NO_HZ code.
> > +
> > + Say N here if you need ultimate kernel/user switch latencies
> > + Say Y if you are unsure
> > +
> > endmenu # "RCU Debugging"
> >
> > config DEBUG_BLOCK_EXT_DEVT
>
next prev parent reply other threads:[~2015-05-13 20:58 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-12 22:30 [PATCH tip/core/rcu 0/24] Initialization/Kconfig updates for 4.2 Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 01/24] rcu: Control grace-period delays directly from value Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 02/24] rcu: Modulate grace-period slow init to normalize delay Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 03/24] rcu: Shut up spurious gcc uninitialized-variable warning Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 04/24] rcu: Panic if RCU tree can not accommodate all CPUs Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 05/24] rcu: Remove superfluous local variable in rcu_init_geometry() Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 06/24] rcu: Cleanup rcu_init_geometry() code and arithmetics Paul E. McKenney
2015-05-13 3:22 ` Steven Rostedt
2015-05-13 13:20 ` Paul E. McKenney
2015-05-14 21:15 ` Alexander Gordeev
2015-05-12 22:30 ` [PATCH tip/core/rcu 07/24] rcu: Simplify rcu_init_geometry() capacity arithmetics Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 08/24] rcu: Limit rcu_state::levelcnt[] to RCU_NUM_LVLS items Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 09/24] rcu: Limit rcu_capacity[] size " Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 10/24] rcu: Remove unnecessary fields from rcu_state structure Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 11/24] rcu: Limit count of static data to the number of RCU levels Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 12/24] rcu: Simplify arithmetic to calculate number of RCU nodes Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 13/24] rcu: Provide diagnostic option to slow down grace-period scans Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 14/24] rcu: Directly drive TASKS_RCU from Kconfig Paul E. McKenney
2015-05-13 13:31 ` Steven Rostedt
2015-05-13 17:14 ` Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 15/24] rcu: Directly drive RCU_USER_QS " Paul E. McKenney
2015-05-13 0:37 ` Frederic Weisbecker
2015-05-13 17:45 ` Paul E. McKenney
2015-05-14 0:27 ` Frederic Weisbecker
2015-05-14 21:12 ` Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 16/24] rcu: Convert CONFIG_RCU_FANOUT_EXACT to boot parameter Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 17/24] rcu: Enable diagnostic dump of rcu_node combining tree Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 18/24] rcu: Create RCU_EXPERT Kconfig and hide booleans behind it Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 19/24] rcu: Break dependency of RCU_FANOUT_LEAF on RCU_FANOUT Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 20/24] rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUT Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 21/24] rcu: Make RCU able to tolerate undefined CONFIG_RCU_FANOUT_LEAF Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 22/24] rcu: Make RCU able to tolerate undefined CONFIG_RCU_KTHREAD_PRIO Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 23/24] rcu: Remove prompt for RCU implementation Paul E. McKenney
2015-05-12 22:30 ` [PATCH tip/core/rcu 24/24] rcu: Conditionally compile RCU's eqs warnings Paul E. McKenney
2015-05-13 13:46 ` Steven Rostedt
2015-05-13 15:06 ` Paul E. McKenney [this message]
2015-06-29 9:39 ` Geert Uytterhoeven
2015-06-29 20:55 ` Paul E. McKenney
2015-06-29 20:58 ` Geert Uytterhoeven
2015-06-30 16:57 ` Paul E. McKenney
2015-05-13 2:59 ` [PATCH tip/core/rcu 01/24] rcu: Control grace-period delays directly from value Steven Rostedt
2015-05-13 17:15 ` Paul E. McKenney
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