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    SubjectRe: [PATCH 00/10] mm: Linux VM Infrastructure to support Memory Power Management
    On Fri, 27 May 2011 18:01:28 +0530 Ankita Garg <> wrote:

    > This patchset proposes a generic memory regions infrastructure that can be
    > used to tag boundaries of memory blocks which belongs to a specific memory
    > power management domain and further enable exploitation of platform memory
    > power management capabilities.

    A couple of quick thoughts...

    I'm seeing no estimate of how much energy we might save when this work
    is completed. But saving energy is the entire point of the entire
    patchset! So please spend some time thinking about that and update and
    maintain the [patch 0/n] description so others can get some idea of the
    benefit we might get from all of this. That estimate should include an
    estimate of what proportion of machines are likely to have hardware
    which can use this feature and in what timeframe.

    IOW, if it saves one microwatt on 0.001% of machines, not interested ;)

    Also, all this code appears to be enabled on all machines? So machines
    which don't have the requisite hardware still carry any additional
    overhead which is added here. I can see that ifdeffing a feature like
    this would be ghastly but please also have a think about the
    implications of this and add that discussion also.

    If possible, it would be good to think up some microbenchmarks which
    probe the worst-case performance impact and describe those and present
    the results. So others can gain an understanding of the runtime costs.

     \ /
      Last update: 2011-05-28 09:57    [W:2.357 / U:0.520 seconds]
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