linux-kernel - Re: [PATCH RFC tip/core/rcu] Make SRCU be once again optional

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Date:   Sat, 3 Jun 2017 13:36:20 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Nicolas Pitre <nicolas.pitre@...aro.org>
Cc:     linux-kernel@...r.kernel.org, josh@...htriplett.org
Subject: Re: [PATCH RFC tip/core/rcu] Make SRCU be once again optional

On Sat, Jun 03, 2017 at 01:18:43AM -0400, Nicolas Pitre wrote:
> On Fri, 2 Jun 2017, Paul E. McKenney wrote:
> 
> > On Fri, May 12, 2017 at 12:10:05PM -0700, Paul E. McKenney wrote:
> > > On Fri, May 12, 2017 at 02:59:48PM -0400, Nicolas Pitre wrote:
> > > > On Fri, 12 May 2017, Paul E. McKenney wrote:
> > 
> > [ . . . ]
> > 
> > > > No.  "Available in mainline" is the name of the game for all I do. If it 
> > > > can't be made acceptable for mainline then it basically has no chance of 
> > > > gaining traction and becoming generally useful. My approach is therefore 
> > > > to always find solutions that can be maintained upstream and contributed 
> > > > to with minimal fuss by anyone.
> > > 
> > > OK, then wish me luck.  ;-)
> > 
> > And still quite a bit of back and forth.  How are things with tty?
> > 
> > One question that came up -- what sort of SoCs are you targeting?
> > A number of people are insisting that smartphone SoCs with 256M DRAM
> > are the minimal systems of the future.  This seems unlikely to me,
> > given the potential for extremely cheap SoCs with EDRAM or some such,
> > but figured I should ask what you are targeting.
> 
> I'm targetting 256 *kilobytes* of RAM. Most likely SRAM. That's not for 
> smart phones but really cheap IoT devices. That's the next area for 
> (trimmed down) Linux to conquer. Example targets are STM32 chips.
> 
> Please see the following for the rationale and how to get there:
> 
> https://lwn.net/Articles/721074/
> 
> http://www.mail-archive.com/search?l=mid&q=alpine.LFD.2.20.1703241215540.2304%40knanqh.ubzr

Ah, thank you for the reminder.  I did read that article, but somehow
got a few megabytes stuck in my head instead of the correct quarter meg.

Anyway, don't look now, but Tiny {S,}RCU just might live on, for a bit
longer, anyway.

							Thanx, Paul