On Thu, Nov 30, 2017 at 4:55 AM, Kuba Mracek <[email protected]> wrote:
> Hi!
>
> On Linux, Does MADV_DONTNEED (used in ReleaseMemoryPagesToOS) actually mark
> the pages as free to be overwritten with zeroes?
Yes, on linux it works as intended.
> It seems that the POSIX
> explanation of POSIX_MADV_DONTNEED means something different ("the system
> can page the memory out, but not discard the content"). Darwin and BSD
> understand MADV_DONTNEED in the POSIX sense, which means that
> ReleaseMemoryPagesToOS doesn't really release any memory on those systems.
> Does it make sense to use some other mechanism of releasing the pages?
On darwin/bsd we should use MADV_FREE instead.
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