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

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Message-ID: <20150701155815.GH3717@linux.vnet.ibm.com>
Date:	Wed, 1 Jul 2015 08:58:15 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Eric Dumazet <edumazet@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Josh Triplett <josh@...htriplett.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>, laijs@...fujitsu.com,
	dipankar@...ibm.com, Andrew Morton <akpm@...ux-foundation.org>,
	mathieu.desnoyers@...icios.com,
	Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org,
	dhowells@...hat.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

On Wed, Jul 01, 2015 at 04:08:27PM +0200, Eric Dumazet wrote:
> > OK, I'll bite.  Exactly what seems especially vile about it?
> 
> Presumably we would need to convert everything to async model
> (call_rcu() and friends),
> but that is a long way to go...
> 
> For example, synchronize_srcu_expedited() in kvm_set_irq_routing()
> really looks overkill.

But synchronize_srcu_expedited() is SRCU, and does not disturb the
rest of the system.

Don't get me wrong, if converting it to call_srcu() helps, why not?
But synchronize_srcu_expedited() isn't messing up HPC or real-time
workloads.

							Thanx, Paul

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