Re: msync() behaviour broken for MS_ASYNC, revert patch?

[Stephen C. Tweedie]

Hi,

On Thu, 2004-04-01 at 17:02, Linus Torvalds wrote:

> > Worse, it doesn't seem to be implemented consistently either.  I've been
> > trying on a few other Unixen while writing this.  First on a Tru64 box,
> > and it is _not_ kicking off any IO at all for MS_ASYNC, except for the
> > 30-second regular sync.  The same appears to be true on FreeBSD.  And on
> > HP-UX, things go in the other direction: the performance of MS_ASYNC is
> > identical to MS_SYNC, both in terms of observed disk IO during the sync
> > and the overall rate of the msync loop.
> 
> If you check HP-UX, make sure it's a recent one. HPUX has historically 
> been just too broken for words when it comes to mmap() (ie some _really_ 
> strange semantics, like not being able to unmap partial mappings etc).

I'm not sure what counts as "recent" for that, but this was on HP-UX
11.  That's the most recent I've got access to.

--Stephen

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