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SubjectRe: [PATCH] mm, vmacache: Add kconfig VMACACHE_SHIFT
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On Thu, 2015-01-22 at 15:57 +0800, WANG Chao wrote:
> Hi, Davidlohr
>
> On 01/21/15 at 11:46pm, Davidlohr Bueso wrote:
> > On Thu, 2015-01-22 at 14:29 +0800, WANG Chao wrote:
> > > Add a new kconfig option VMACACHE_SHIFT (as a power of 2) to specify the
> > > number of slots vma cache has for each thread. Range is chosen 0-4 (1-16
> > > slots) to consider both overhead and performance penalty. Default is 2
> > > (4 slots) as it originally is, which provides good enough balance.
> > >
> >
> > Nack. I don't feel comfortable making scalability features of core code
> > configurable.
>
> Out of respect, is this a general rule not making scalability features
> of core code configurable?

I doubt its a rule, just common sense. Users have no business
configuring such low level details. The optimizations need to
transparently work for everyone.

Thanks,
Davidlohr



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