[Bug 197579] Re: Ubiquity should advise kernel to discard pages from copied files

[Phillip Susi]

What we really want is POSIX_FADV_NOREUSE, but linux does not currently
implement it.  Also it won't make a difference during install since
there aren't other, more important pages that should be cached instead,
so I'm going to close this bug.


** Changed in: ubiquity (Ubuntu)
       Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/197579

Title:
  Ubiquity should advise kernel to discard pages from copied files

Status in “ubiquity” package in Ubuntu:
  Won't Fix

Bug description:
  The linux kernel supports the O_STREAMING flag for open(), which
  suggests to the kernel that the file will only be used once and so the
  pages should be discarded from the cache as soon as they are used.
  This could make the performance of the LiveCD much better when
  ubiquity is copying files.

  This would be a trivial improvement if python supported O_STREAMING; perhaps upstream python should be persuaded to support O_STREAMING. See:
  http://irclogs.ubuntu.com/2007/04/17/%23ubuntu-kernel.txt

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