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,
Borislav Petkov <bp@alien8.de>, Borislav Petkov <bp@suse.de>
Subject: Re: [PATCH tip/core/rcu 01/11] rcu: Expedite grace periods during suspend/resume
Date: Sat, 17 Aug 2013 20:17:17 -0700 [thread overview]
Message-ID: <20130818031717.GL28923@leaf> (raw)
In-Reply-To: <1376789876-27594-1-git-send-email-paulmck@linux.vnet.ibm.com>
On Sat, Aug 17, 2013 at 06:37:46PM -0700, Paul E. McKenney wrote:
> From: Borislav Petkov <bp@alien8.de>
>
> CONFIG_RCU_FAST_NO_HZ can increase grace-period durations by up to
> a factor of four, which can result in long suspend and resume times.
> Thus, this commit temporarily switches to expedited grace periods when
> suspending the box and return to normal settings when resuming.
>
> [ paulmck: This also papers over an audio/irq bug, but hopefully that will
> be fixed soon. ]
>
> Signed-off-by: Borislav Petkov <bp@suse.de>
> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This patch still seems like a hack, and there *ought* to be a better
general solution to avoid excessive grace-period latency. Nonetheless,
in the absence of such a solution,
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
next prev parent reply other threads:[~2013-08-18 3:17 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-18 1:37 [PATCH tip/core/rcu 0/11] Fixes for 3.12 Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 01/11] rcu: Expedite grace periods during suspend/resume Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 02/11] rcu: Expedite during suspend and resume only on smallish systems Paul E. McKenney
2013-08-18 3:18 ` Josh Triplett
2013-08-19 0:32 ` Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 03/11] rcu: Simplify debug-objects fixups Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 04/11] debugobjects: Make debug_object_activate() return status Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 05/11] rcu: Make call_rcu() leak callbacks for debug-object errors Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 06/11] rcu: Switch to exedited grace periods for suspend as well as hibernation Paul E. McKenney
2013-08-18 3:20 ` Josh Triplett
2013-08-19 0:33 ` Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 07/11] rcu: Avoid redundant grace-period kthread wakeups Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 08/11] rculist: list_first_or_null_rcu() should use list_entry_rcu() Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 09/11] rcu: Select IRQ_WORK from TREE_PREEMPT_RCU Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 10/11] rcu: Simplify _rcu_barrier() processing Paul E. McKenney
2013-08-18 1:37 ` [PATCH tip/core/rcu 11/11] jiffies: Avoid undefined behavior from signed overflow Paul E. McKenney
2013-08-18 3:23 ` Josh Triplett
2013-08-19 0:41 ` Paul E. McKenney
2013-08-19 1:20 ` Josh Triplett
2013-08-19 4:14 ` Paul E. McKenney
2013-08-18 3:17 ` Josh Triplett [this message]
2013-08-18 9:34 ` [PATCH tip/core/rcu 01/11] rcu: Expedite grace periods during suspend/resume Borislav Petkov
2013-08-19 0:29 ` Paul E. McKenney
2013-08-19 9:18 ` Borislav Petkov
2013-08-18 3:24 ` [PATCH tip/core/rcu 0/11] Fixes for 3.12 Josh Triplett
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