Re: [RFC] Templates and tweaks (for size performance and more)

[Andrew Morton]

Tom Rini wrote:
> 
> On Thu, Nov 07, 2002 at 11:27:25AM -0800, Andrew Morton wrote:
> > Tom Rini wrote:
> > >
> > > Comments?
> >
> > You missed this little fella:
> >
> >    text    data     bss     dec     hex filename
> >    1735    1120  131104  133959   20b47 kernel/pid.o
> >
> >
> > Have a controversial patch which takes it to:
> >
> >    text    data     bss     dec     hex filename
> >    1614    1120    2080    4814    12ce kernel/pid.o
> 
> My patch isn't about size per-se, it's about tweaking the kernel and
> making it easier to do things like get a small kernel.  Or work on boxes
> with large amounts of memory and not use HIGHMEM, or otherwise have
> tweakable params with N different config options.
> 

Yes.  Replace PIDHASH_SHIFT (in that patch) with TWEAK_PIDHASH_SHIFT.
It must be a power of two.

Those tables are currently 128k even on the teeniest little
uniprocessor build.