linux-kernel - Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging normal ones

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Date:	Thu, 2 Jul 2015 20:35:57 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, josh@...htriplett.org,
	linux-kernel@...r.kernel.org, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...icios.com, tglx@...utronix.de,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com
Subject: Re: [PATCH RFC tip/core/rcu 0/5] Expedited grace periods encouraging
 normal ones


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> > And it's not like it's that hard to stem the flow of algorithmic sloppiness at 
> > the source, right?
> 
> OK, first let me make sure that I understand what you are asking for:
> 
> 1.	Completely eliminate synchronize_rcu_expedited() and
> 	synchronize_sched_expedited(), replacing all uses with their
> 	unexpedited counterparts.  (Note that synchronize_srcu_expedited()
> 	does not wake up CPUs, courtesy of its read-side memory barriers.)
> 	The fast-boot guys are probably going to complain, along with
> 	the networking guys.
> 
> 2.	Keep synchronize_rcu_expedited() and synchronize_sched_expedited(),
> 	but push back hard on any new uses and question any existing uses.
> 
> 3.	Revert 74b51ee152b6 ("ACPI / osl: speedup grace period in
> 	acpi_os_map_cleanup").
> 
> 4.	Something else?

I'd love to have 1) but 2) would be a realistic second best option? ;-)

Thanks,

	Ingo
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