Re: [PATCH] MM: implement MADV_FREE lazy freeing of anonymous memory

From: Rik van Riel
Date: Mon May 07 2007 - 12:52:22 EST


Ulrich Drepper wrote:
Rik van Riel wrote:
It's trivial to merge the MADV_FREE #defines into the kernel
though, and aliasing MADV_FREE to MADV_DONTNEED for the time
being is a one-liner - just an extra constant into the big
switch statement in sys_madvise().

Until the semantics of the implementation is cut into stone by having it in the kernel I'll not start using it.

The current MADV_DONTNEED implementation conforms to the
semantics of MADV_FREE :)

With MADV_FREE you can get back either your old data, or
a freshly zeroed out new page. Always getting back the
second alternative is conformant :)

--
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