Re: [RFC] Tight check of pfn_valid on sparsemem

[KAMEZAWA Hiroyuki]

On Tue, 13 Jul 2010 16:58:08 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:

> On Tue, 13 Jul 2010 16:34:17 +0900
> KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> wrote:
> 
> > Anyway, sparsemem is designed to be aligned to SECTION_SIZE of memmap.
> > Please avoid adding new Spaghetti code without proper configs.
> > Thanks,
> 
> Ok, I realized I misunderstand all. Arm doesn't unmap memmap but reuse the page
> for memmap without modifing ptes. My routine only works when ARM uses sparsemem_vmemmap.
> But yes, it isn't.
> 
> Hmm...How about using pfn_valid() for FLATMEM or avoid using SPARSEMEM ?
> If you want conrols lower than SPARSEMEM, FLATMEM works better because ARM unmaps memmap.
                      allocation of memmap in lower granule than SPARSEMEM.


How about stop using SPARSEMEM ? What's the benefit ? It just eats up memory for
mem_section[].

Sorry,
-Kame

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