Re: [PATCH] [Request for inclusion] Filesystem in Userspace

From: Nikita Danilov (nikita_at_clusterfs.com)
Date: 11/18/04

  • Next message: Colin Leroy: "[PATCH]" 
    To: fsdevel <owner-linux-fsdevel@vger.rutgers.edu>
Date:	Thu, 18 Nov 2004 23:13:17 +0300

    Linus Torvalds <torvalds@osdl.org> writes:

    [...]

    >
    > We actually had (for a short while) code that tracked the dirty bit in
    > software (ie make it unwritable by default, and take the write fault), but
    > people showed that that was actually a real performance problem on some
    > loads.

    Dirtiness can be tracked for a fraction of pages (for example, make pte
    unwritable when page crosses active/inactive list boundary, or
    alike). This will allow kernel to guarantee that there really is _known_
    amount of clean pages in the system, without taking a lot of unnecessary
    faults.

    [... notes on kernel development methodology skipped ...]

    >
    > Linus

    Nikita.
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