> Hi,
>
> On 24 Jun 1998 23:56:28 -0500, ebiederm+eric@npwt.net (Eric
> W. Biederman) said:
>
> > mmap, madvise(SEQUENTIAL),write
> > is easy to implement. The mmap layer already does readahead, all we
> > do is tell it not to be so conservative.
>
> Swap readhead is also now possible. However, madvise(SEQUENTIAL) needs
> to do much more than this; it needs to aggressively track what region of
> the vma is being actively used, and to unmap those areas no longer in
> use.
Remember it's *regions* not just a region. An http/ftp server sends the
same file over and over and over. There are many cursors moving
sequentially within the same file. A threaded http/ftp server will have a
single mmap, and multiple users of that mmap.
Dean
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