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    SubjectRe: [Lse-tech] [RFC PATCH] scheduler: Dynamic sched_domains
    Matthew Dobson wrote:
    > On Fri, 2004-10-08 at 03:40, Nick Piggin wrote:
    >
    >>And so you want to make a partition with CPUs {0,1,2,4,5}, and {3,6,7}
    >>for some crazy reason, the new domains would look like this:
    >>
    >>0 1 2 4 5 3 6 7
    >>--- - --- - --- <- 0
    >> | | | | |
    >> ----- - - - <- 1
    >> | | | |
    >> ------- ----- <- 2 (global, partitioned)
    >>
    >>Agreed? You don't need to get fancier than that, do you?
    >>
    >>Then how to input the partitions... you could have a sysfs entry that
    >>takes the complete partition info in the form:
    >>
    >>0,1,2,3 4,5,6 7,8 ...
    >>
    >>Pretty dumb and simple.
    >
    >
    > How do we describe the levels other than the first? We'd either need
    > to:
    > 1) come up with a language to describe the full tree. For your example
    > I quoted above:
    > echo "0,1,2,4,5 3,6 7,8;0,1,2 4,5 3 6,7;0,1 2 4,5 3 6,7" > partitions

    I think the idea was that the full hierarchy was (automatically) derived
    from the partition in a way that best matched the physical layout of the
    machine?

    >
    > 2) have multiple files:
    > echo "0,1,2,4,5 3,6,7" > level2
    > echo "0,1,2 4,5 3 6,7" > level1
    > echo "0,1 2 4,5 3 6,7" > level0
    >
    > 3) Or do it hierarchically as Paul implemented in cpusets, and as I
    > described in an earlier mail:
    > mkdir level2
    > echo "0,1,2,4,5 3,6,7" > level2/partitions
    > mkdir level1
    > echo "0,1,2 4,5 3 6,7" > level1/partitions
    > mkdir level0
    > echo "0,1 2 4,5 3 6,7" > level0/partitions
    >
    > I personally like the hierarchical idea. Machine topologies tend to
    > look tree-like, and every useful sched_domain layout I've ever seen has
    > been tree-like. I think our interface should match that.
    >
    > -Matt
    >
    > -
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    --
    Peter Williams pwil3058@bigpond.net.au

    "Learning, n. The kind of ignorance distinguishing the studious."
    -- Ambrose Bierce
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