linux-kernel - Re: [PATCH v2 tip/core/rcu 0/10] RCU-tasks implementation

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Message-ID: <20140731210821.GD11241@linux.vnet.ibm.com>
Date:	Thu, 31 Jul 2014 14:08:22 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
	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 v2 tip/core/rcu 0/10] RCU-tasks implementation

On Thu, Jul 31, 2014 at 12:29:36PM -0700, Andi Kleen wrote:
> "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> writes:
> 
> > Hello!
> >
> > This series provides a prototype of an RCU-tasks implementation, which has
> > been requested to assist with tramopoline removal.
> 
> Is that trampoline removal (whatever it is) important enough to justify
> adding that much new (and complicated) code? Are there other potential
> users of this? Is the long term maintenance cost justified?
> Will RCU keep growing forever?

My answers to all of these questions is "I don't know."

That said, I cannot resist pointing out that similar questions could be
asked of a great many other subsystems of the Linux kernel, or indeed
of the Linux kernel as a whole.  ;-)

And things do appear to be moving in a good direction for RCU-tasks:

	v1: 18 files changed, 749 insertions(+), 55 deletions(-)
	v2: 18 files changed, 590 insertions(+), 83 deletions(-)
	v3: 17 files changed, 447 insertions(+), 32 deletions(-)

The numbers for v3 are tentative, and might change based on test results.

							Thanx, Paul

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