Re: [PATCH] idr: Document ida tree sections

[Kent Overstreet]

On Fri, Aug 09, 2013 at 10:57:56AM -0400, Tejun Heo wrote:
> Hello,
> 
> On Wed, Aug 07, 2013 at 01:51:17PM -0700, Kent Overstreet wrote:
> > + * So if the max section size is 64k, that's ~4096 sections, with 8 byte
> > + * pointers that's a little over 32k for the pointers to sections.
> > + *
> > + * That means max size sections are order 4 page allocations.
> 
> Order 4 allocations for common data structure doesn't really sound
> like a good idea to me.  It's gonna work fine on relatively large
> machines but suck on mobile / small embedded devices, many of which
> are still struggling with 32bit address space and compaction may not
> be enabled.  It just doens't make sense to me to impose 64k
> allocations from low level library function like ida.

Would this be an acceptable solution?