[Bug 240061] MADV_FREE rewinds time to before fork()

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240061

Mark Johnston <markj at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |alc at FreeBSD.org,
                   |                            |kib at FreeBSD.org,
                   |                            |markj at FreeBSD.org

--- Comment #1 from Mark Johnston <markj at FreeBSD.org> ---
Out of curiosity, how did you come to notice this behaviour?

I think the solution you proposed would solve the problem.  We would want to
ensure that the restrictions specified in vm_object_advice_applies() are
checked before modifying the object chain.  In particular, MADV_FREE only marks
pages clean at the MI layer if the object is anonymous and is mapped into no
more than one address space.  For OBJT_VNODE mappings, MADV_FREE does not clear
the MI dirty bits or requeue the page, but it will clear the dirty bit from
PTEs in the specified range.

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