Re: [PATCH v5] add MAP_UNLOCKED mmap flag

KOSAKI Motohiro
2010-01-14T00:31:11Z

> If application does mlockall(MCL_FUTURE) it is no longer possible to mmap
> file bigger than main memory or allocate big area of anonymous memory
> in a thread safe manner. Sometimes it is desirable to lock everything
> related to program execution into memory, but still be able to mmap
> big file or allocate huge amount of memory and allow OS to swap them on
> demand. MAP_UNLOCKED allows to do that.
>
> Signed-off-by: Gleb Natapov <gleb@redhat.com>
> ---
>
> I get reports that people find this useful, so resending.

This description is still wrong. It doesn't describe why this patch is useful.