Re: [PATCH] Permit inode & dentry hash tables to be allocated >MAX_ORDER size

[Dave Hansen]

On Fri, 2004-06-11 at 17:21, Andi Kleen wrote:
> "Martin J. Bligh" <mbligh@xxxxxxxxxxx> writes:
> >
> > Allocating the big-assed hashes out of bootmem seems much cleaner to me,
> > at least ...
> 
> Machines big enough that such big hashes make sense are probably NUMA.
> And on NUMA systems you imho should rather use node interleaving vmalloc(),
> not a bit physical allocation on a specific node for these hashes. 
> This will avoid memory controller hot spots and avoid the problem completely.
> Likely it will perform better too.

Since vmalloc() maps the pages with small pagetable entries (unlike most
of the rest of the kernel address space), do you think the interleaving
will outweigh any negative TLB effects?  

-- Dave

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