linux-kernel - Re: FYI, tiny-kernel fix for rcu

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Date:   Sat, 6 May 2017 09:15:51 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: FYI, tiny-kernel fix for rcu_segcblist separate .c file

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

> Hello, Ingo,
> 
> Just in case you get complaints about kernel size...
> 
> In response to Linus's feedback, I did commit 98059b98619d ("rcu:
> Separately compile large rcu_segcblist functions"), which of course
> has the side-effect of bloating Tiny SRCU, which 0day Test Robot
> complains about.
> 
> So I have queued commit 7bf7fa5acc92 ("srcu: Apply trivial callback
> lists to shrink Tiny SRCU"), which makes up for the bloating and then some.
> 
> I don't believe that this debloating is at all urgent because people
> building kernels for small-memory devices have to do a lot of other
> tweaking, so that applying this additional commit as a patch should
> not be too much incremental pain.
> 
> So again, if you get complaints about 98059b98619d bloating tiny
> kernel builds, 7bf7fa5acc92 is the fix.

Ok!

I do agree that it's not urgent: single CPU systems are rapidly becoming the 
exception for new hardware designed, even for embedded systems. At this point
I think the educational value of TinyRCU is its main quality.

Thanks,

	Ingo