Re: [RFC PATCH v2] tinification: Introduce CONFIG_SRCU to make SRCU optional

From: Pranith Kumar
Date: Thu Dec 04 2014 - 10:37:23 EST

On 12/04/2014 01:27 AM, Paul E. McKenney wrote:
> For the moment, I applied this to -rcu against v3.18-rc6 to get some 0day
> testing on it.
> There are conflicts against the tip of my tree, but will worry about
> that later. I don't have a ready answer on whether or not this needs
> to be split up -- in the worst case, we would add the SRCU Kconfig
> parameter, add all the selects, then once they all hit mainline add the
> Makefile change.
> We will need stats on how much memory was saved, and a "size kernel/rcu/srcu.o"
> after a UP/tiny build should do it. Could you please add this to the
> commit log?

So if we do not select CONFIG_SRCU, srcu.o will not be compiled at all. So we should save about

text data bss dec hex filename
2007 0 0 2007 7d7 kernel/rcu/srcu.o

as in size of arch/powerpc/boot/zImage changes from

text data bss dec hex filename
831552 64180 23944 919676 e087c arch/powerpc/boot/zImage : before
829504 64180 23952 917636 e0084 arch/powerpc/boot/zImage : after

so about ~2000 bytes I guess.


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