RFR: Hint unused regions instead of uncommit them

[Aleksey Shipilev]

On 01/16/2018 02:13 PM, Zhengyu Gu wrote:
>> As I read MADV_DONTNEED man page and the explanations of different kernel people, I am getting
>> uneasy using this. madvise call that basically corrupts memory, say what? And it also does not
>> support large pages...
> Hummm ... can you point me how it can corrupt memory? since it is the way how thread stack is released.

Ah, I meant that it is very surprising to have madvise to do anything that affects correctness
MADV_DONTNEED basically destructs the page contents, as far as application is concerned. Awkward API...

-Aleksey