Fwd: review(XXS): 7060842: UseNUMA crash with UseHugreTLBFS running SPECjvm2008

Igor Veresov igor.veresov at oracle.com
Wed Aug 3 15:09:24 PDT 2011

On 8/3/11 2:58 PM, Ramki Ramakrishna wrote:
> On 8/3/2011 2:47 PM, Igor Veresov wrote:
>> On 8/3/11 2:33 PM, Ramki Ramakrishna wrote:
>>> Yikes... a Linux man page i found does not say anything about swap
>>> reservation:
>>> Do not expect access in the near future. (For the time being, the
>>> application is finished with the given range, so the kernel can free
>>> resources associated with it.) Subsequent accesses of pages in this
>>> range will succeed, but will result either in re-loading of the
>>> memory contents from the underlying mapped file (see *mmap*()) or
>>> zero-fill-on-demand pages for mappings without an underlying file.
>> That's MADV_DONTNEED, we tried to use MADV_FREE, but there's nothing
>> about it's semantics either with regard to reservations.
> Yr webrev shows DONT_NEED as the previous version in Linux. (Perhaps you
> are confusing with Solaris
> where you do an MADV_FREE perhaps?)

Yes, of course, that was Solaris talking. :) Sorry.


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