Re: Aw: Re: Aw: Re: Setting mtime doesn't work after copying a file with mmap

[christos%astron.com@localhost (Christos Zoulas)]

In article <1328193710.334702.1449669857042.JavaMail.ngmail%webmail09.arcor-online.net@localhost>,
Carsten Kunze  <carsten.kunze%arcor.de@localhost> wrote:
>christos%astron.com@localhost (Christos Zoulas) wrote:
>
>> How often should it be updated?
>
>Only once on munmap?  If it is updated at an unpredictable time it makes
>something like utime(2) senseless (since it is changed anyway).  Always
>use msync is a performance issue for e.g. "cp -p ..." (so I think cp(1)
>doesn't use mmap for copying).
>
>If the current behaviour is 4.4BSD derived it is ok, but if it's "only"
>NetBSD specific it is maybe not optimal.

Someone with uvm knowledge is better suited to answer this... perhaps
uvn_detach should update {m,a}times?

christos