On Thu, Sep 29, 2005 at 02:09:27PM +0200, Blaisorblade wrote:
> Again, that page is not bad. There is no page yet for this address, and the
> host won't allocate one for now.
It is bad in the sense that, unless some space is freed on that mount, a
reference to the page will always fault.
> Ok, this makes a bit of sense, even if IMHO it doesn't work, I now see your
> point (but I still insist with what said above).
Explain why it doesn't work.
> However, even a dirtied page could be "bad", if it has been swapped. If
> we're getting a SIGBUS, it meant that it didn't succeed in freeing any
> memory.
No it can't. A swapped page still counts as occupying space in the filesystem.
If a page was successfully allocated, then accesses to it will always succeed,
even if it needs to be swapped in.
> And, frankly, unless the UML ram file is kept on ramfs (which is RAM-only),
> it can be swapped (both for disk-based filesystem and for tmpfs).
> So, I don't think what you suggest could work.
Swapping makes no difference.
Jeff
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