Messages in this thread | | | Date | Sun, 25 Mar 2007 16:00:50 -0800 | From | Andrew Morton <> | Subject | Re: [patch 2/3] only allow nonlinear vmas for ram backed filesystems |
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On Sat, 24 Mar 2007 23:09:19 +0100 Miklos Szeredi <miklos@szeredi.hu> wrote:
> Dirty page accounting/limiting doesn't work for nonlinear mappings,
Doesn't it? iirc the problem is that we don't correctly re-clean the ptes while starting writeout. And the dirty-page accounting is in fact correct (it'd darn well better be).
> so > for non-ram backed filesystems emulate with linear mappings. This > retains ABI compatibility with previous kernels at minimal code cost. > > All known users of nonlinear mappings actually use tmpfs, so this > shouldn't have any negative effect.
Unless someone is using remap_file_pages() against an ext3 file, in which case their application stops working?
That would be a problem. These guys: http://www.technovelty.org/code/linux/fremap.html, for example, will be in for a little surprise.
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