Re: headsup: swap_pager.c

From: David Schultz (das_at_freebsd.org)
Date: 08/01/03

  • Next message: Poul-Henning Kamp: "Re: headsup: swap_pager.c" 
    Date: Fri, 1 Aug 2003 09:51:50 -0700
To: Poul-Henning Kamp <phk@phk.freebsd.dk>

    On Fri, Aug 01, 2003, Poul-Henning Kamp wrote:
    > In message <20030801083628.GB56492@skywalker.creative.net.au>, Adrian Chadd wri
    > tes:
    > >On Fri, Aug 01, 2003, Poul-Henning Kamp wrote:
    > >
    > >> >Can you please describe how the interface between ccd(4) and the
    > >> >swap subsystem will work? I like this idea, but it isn't
    > >> >immediately obvious how you plan to implement striping based on
    > >> >load and dynamic addition and removal of swap space.
    > >>
    > >> ccdconfig -c ccd0 128 0 /dev/da0b /dev/da1b /dev/da2b
    > >> swapon /dev/ccd0
    > >
    > >.. and if I want to add another swap device, will that work?
    >
    > Yes, but it will of course not be striped with the rest, it will
    > be laid out sequentially.
    >
    > And as a side effect you will not run into the NSWAP=4 limitation
    > any more.

    Aah, okay. That's both a small improvement and a small regression
    in one. The point of the static striping was to allow you to add
    swap devices and have them be automatically interleaved, so of
    course you can ``fix'' its limitations by removing it completely.

    I was kinda hoping you had a more flexible (albeit complex) plan
    in mind that would allow swap space to be striped on the fly based
    on disk load, free space on each disk, etc.
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