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    SubjectRe: [PATCH] cpuset: Rework sched domains and CPU hotplug handling
    Peter Zijlstra wrote:
    > On Mon, 2008-07-28 at 16:07 +0200, Ingo Molnar wrote:
    >> * Max Krasnyansky <> wrote:
    >>> Max Krasnyansky wrote:
    >>>> This is an updated version of my previous cpuset patch:
    >>>> "Make rebuild_sched_domains() usable from any context (take 2)"
    >>> Folks,
    >>> Any comments on this patch ? We need this to complete sched domain
    >>> handling fixes/improvements that we started with the cpu_active_map,
    >>> and to avoid circular locking issues in the cpu hotplug ->
    >>> rebuild_sched_domains path.
    >> Paul, Peter, any comments?
    > I'm really not that at home with all that cgroup fiddling, so I'd like a
    > word from the two Pauls..
    > Questions I have at the moment:
    > - do we really need a new workqueue for this? Can't we use the regular
    > keventd stuff, now that Oleg fixed the get_online_cpus() thing?
    > (3da1c84c00c7e5fa8348336bd8c342f9128b0f14)
    No we do not. I was not sure when that will workqueue fix would go in.
    I'll send a delta patch on top.

    > - aren't there funny races with the async_rebuild_sched_domains()
    > stuff?
    Rebuilds via cpu hotplug path are synchronous, which I believe is
    Rebuilds caused by writes into /dev/cpuset do not have to be. I cannot
    think of a scenario where race in that path would be an issue.


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