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    Subject[PATCH v2 0/2] cpu: pseries: Offline state framework.

    This is the version 2 of the patch series to provide a cpu-offline framework
    that enables the administrators choose the state the offline CPU must be put
    into when multiple such states are exposed by the underlying architecture.

    Version 1 of the Patch can be found here:

    The patch-series exposes the following sysfs tunables to
    allow the system-adminstrator to choose the state of a CPU:

    To query the available hotplug states, one needs to read the sysfs tunable:
    To query or set the current state, on needs to read/write the sysfs tunable:

    The patchset ensures that the writes to the "current_state" sysfs file are
    serialized against the writes to the "online" file.

    This patchset also contains the offline state driver implemented for
    pSeries. For pSeries, we define three available_hotplug_states. They are:

    online: The processor is online.

    deallocate: This is the the default behaviour when the cpu is offlined
    even in the absense of this driver. The CPU would call make an
    rtas_stop_self() call and hand over the CPU back to the resource pool,
    thereby effectively deallocating that vCPU from the LPAR.
    NOTE: This would result in a configuration change to the LPAR
    which is visible to the outside world.

    deactivate: This cedes the vCPU to the hypervisor which
    in turn can put the vCPU time to the best use.
    NOTE: This option DOES NOT result in a configuration change
    and the vCPU would be still entitled to the LPAR to which it earlier
    belong to.

    Awaiting your feedback.

    Gautham R Shenoy (2):
    cpu: Implement cpu-offline-state driver for pSeries.
    cpu: Offline state Framework.

    arch/powerpc/platforms/pseries/Makefile | 2
    arch/powerpc/platforms/pseries/hotplug-cpu.c | 76 +++++++++-
    arch/powerpc/platforms/pseries/offline_driver.c | 161 +++++++++++++++++++++
    arch/powerpc/platforms/pseries/offline_driver.h | 20 +++
    arch/powerpc/platforms/pseries/smp.c | 17 ++
    drivers/base/cpu.c | 176 ++++++++++++++++++++++-
    include/linux/cpu.h | 30 ++++
    7 files changed, 465 insertions(+), 17 deletions(-)
    create mode 100644 arch/powerpc/platforms/pseries/offline_driver.c
    create mode 100644 arch/powerpc/platforms/pseries/offline_driver.h

    Thanks and Regards

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      Last update: 2009-08-28 12:03    [W:0.022 / U:2.540 seconds]
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