Re: Memory mapped files question

[H. Peter Anvin]

Jamie Lokier wrote:
> 
> It's a quality of implementation issue if data can remain dirty in RAM
> forever without ever being flushed.
> 
> Can this really happen with normal open/mmap/munmap/close usage, or
> does it only occur with long-lived processes like innd which mmap a
> file, dirty the pages but never munmap them?
> 
> If the former case does happen, I'd say we're failing on quality of
> implementation.  If it's only the latter case, though, fair enough: the
> application writer will have to use msync().
> 

The latter, I'm pretty sure.  After all, that's what pgflush/bdflush is 
all about.