Re: Q about pagecache data never written to disk

[Nick Piggin]

William Lee Irwin III wrote:
> On Thu, Sep 09, 2004 at 11:32:01PM +1000, Nick Piggin wrote:
>
> > writeback isn't, but the pages will get marked dirty at unmap.
> > But I think I am wrong actually - I don't actually see why the
> > user would have to have the file open.
>
>
> Dirty memory "limits" have no force as applied to mmap() IO, which is
> not a pretty state of affairs with respect to various attempts the VM
> makes at mitigating data structure proliferation associated with dirty
> data.

Yeah I know. data structure proliferation and just the simple fact
that it can't immediately be freed is a problem.

What is the alternative? Take a fault every time we write to a clean,
mmapped page?
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