On 11/06/2017 07:18 AM, Aneesh Kumar K.V wrote:
We should not return that address, unless we requested with a hint value of > 128TB. IIRC we discussed this early during the mmap interface change and said, we will return an address > 128T only if the hint address is above 128TB (not hint addr + length). I am not sure why we are finding us returning and address > 128TB with paca limit set to 128TB?
See the memory maps I posted. I think it was not anticipated that the heap could be near the 128 TiB limit because it is placed next to the initially mapped object.
I think this could become worse once we have static PIE support because static PIE binaries likely have the same memory layout. (Ordinary PIE does not.)
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