RE: show_mem() for ia64 discontig takes a really long time on large systems.

From: Dave Hansen <haveblue_at_us.ibm.com>
Date: 2006-03-31 05:26:23
On Thu, 2006-03-30 at 10:18 -0800, Luck, Tony wrote:
> > What about the earlier proposal of advancing at pmd and pud granule by
> > walking the page table?  There it can walk at 32MB/64GB step.
> 
> That puts constraints on where the platform may align physical
> memory.  32M may not be unreasonable (Can you even buy DIMMS that
> small anymore?) But 64G is way too large.
> 
> Since we only deal with blocks of memory in IA64_GRANULE_SIZE
> pieces (16M or 64M) that would seem to be the natural skip
> amount.

Instead of tacking on yet another hack to vmem_map[], is this perhaps a
time to think about moving to sparsemem on systems where you see these
issues?  Are there remaining issues that ia64 has with it? 

-- Dave

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Received on Fri Mar 31 05:26:45 2006

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