Re: [RFC][PATCH] hugetlb: add information and interface in sysfs [Was Re: [RFC][PATCH 4/5] Documentation: add node files to sysfs ABI]

[Nishanth Aravamudan <nacc@us.ibm.com>]

On 28.04.2008 [14:29:02 -0700], Christoph Lameter wrote:
> On Mon, 28 Apr 2008, Nishanth Aravamudan wrote:
> 
> > More importnatly, I think the fact that IA64 supports multiple hugepage
> > sizes is a reason *for* moving to sysfs for this information? However, I
> > think we may need to massage the IA64-specific bits of the kernel to
> > actually support multiple hugepage size pools being available at
> > run-time? That is, with the current kernel, we can only support one
> > hugepagesize at run-time, due to VHPT restrictions?
> 
> We'd love to have multiple huge page pools available but the current
> rigid region setup limits us to one size. Switching off the VHPT or
> doing some tricks with the tlb fault handler, or freeing up an unused
> region (region 0?) could get us there.

Ok, that was my impression. So on IA64, without further kernel
modifications, we will always only have one hugepage size visible in
/proc/meminfo and /sys/kernel/hugepages?

Thanks,
Nish

-- 
Nishanth Aravamudan <nacc@us.ibm.com>
IBM Linux Technology Center

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