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    SubjectRe: [PATCH 00/10] vtime: Delay cputime accounting to tick
    On Tue, Dec 06, 2016 at 03:32:13AM +0100, Frederic Weisbecker wrote:
    > This follows up Martin Schwidefsky's patch which propose to delay
    > cputime accounting to the tick in order to minimize the calls to
    > account_system_time() and alikes as these functions can carry quite some
    > overhead:
    >
    > http://lkml.kernel.org/r/20161121111728.13a0a3db@mschwide
    >
    > The set includes Martin's patch, rebased on top of tip:sched/core and
    > latest s390 changes, and extends it to the other implementations of
    > CONFIG_VIRT_CPU_ACCOUNTING_NATIVE (powerpc and ia64) along with a few
    > core changes to adapt the whole.
    >
    > Only built-tested though as I don't have access to any of these archs.

    The patches look reasonable at a quick look. I assume that to test
    them, we would want to run a guest in an overcommitted system, so as
    to get some steal time. Do you have any more specific suggestions as
    to what to run as a test? Just run some benchmark and see if the
    user/system/irq times look reasonable? Or do you have something more
    quantitative?

    Paul.

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