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Date:	Sat, 17 Aug 2013 20:17:17 -0700
From:	Josh Triplett <>
To:	"Paul E. McKenney" <>
Cc:,,,,,,,,,,,,,,, Borislav Petkov <>,
	Borislav Petkov <>
Subject: Re: [PATCH tip/core/rcu 01/11] rcu: Expedite grace periods during

On Sat, Aug 17, 2013 at 06:37:46PM -0700, Paul E. McKenney wrote:
> From: Borislav Petkov <>
> 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 <>
> Signed-off-by: Paul E. McKenney <>

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 <>
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