Re: [MODSLAB 3/7] A Kmalloc subsystem

From: Christoph Lameter
Date: Fri Aug 18 2006 - 12:56:17 EST

On Fri, 18 Aug 2006, KAMEZAWA Hiroyuki wrote:

> Just a note: with SPARSEMEM, we need more calculation and access to
> mem_section[] table and page structs(mem_map).

Uhh, a regression against DISCONTIG. Could you address that issue?

> > vmalloc_to_addr is certainly slower due to the page table walking. But the
> > user already is aware of the fact that vmalloc memory is not as fast as
> > direct mapped.

> Considering some code walking through a list of objects scattered over all memory,
> Is virtually-mapped area really slow ?

On most arches it is somewhat slower. IA64 is special in the sense that it
has virtually mapped kernel memory.
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