Carsten Kunze <carsten.kunze%arcor.de@localhost> writes: > 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. My first question is always: What does POSIX say? Also, I wonder if there are any synchronization guarantees about *time updates on write or close with regular file ops.
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