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    SubjectRe: [PATCH v2 0/4] ata port runtime power management support
    On Thu, Nov 10, 2011 at 10:30:53AM -0500, Alan Stern wrote:
    > Currently, disks will not be runtime-suspended unless (1) the user
    > requests it by setting the appropriate power/control attribute, and (2)
    > the device file is closed (in particular, the disk has no mounted
    > filesystems or swap partitions). I don't imagine this combination of
    > events is very common for disks using libata.

    Empty ports are pretty common and pm should be able to put the
    unoccupied ports and the containing pci device into sleep state which
    can save some power. Would be nice to have some numbers tho. But
    either way, if this doesn't break anything, I don't see any reason to
    object to it - the hierarchy reorg is more of logical cleanup and
    runtime pm is trivial afterwards.

    Thanks.

    --
    tejun


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