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    SubjectRe: [linux-pm] [PATCH 0/8] Suspend block api (version 8)
    On Thu, 27 May 2010, Rafael J. Wysocki wrote:

    > On Thursday 27 May 2010, Thomas Gleixner wrote:
    > > On Thu, 27 May 2010, Alan Stern wrote:
    > >
    > > > On Thu, 27 May 2010, Felipe Balbi wrote:
    > > >
    > > > > On Thu, May 27, 2010 at 05:06:23PM +0200, ext Alan Stern wrote:
    > > > > >If people don't mind, here is a greatly simplified summary of the
    > > > > >comments and objections I have seen so far on this thread:
    > > > > >
    > > > > > The in-kernel suspend blocker implementation is okay, even
    > > > > > beneficial.
    > > > >
    > > > > I disagree here. I believe expressing that as QoS is much better. Let
    > > > > the kernel decide which power state is better as long as I can say I
    > > > > need 100us IRQ latency or 100ms wakeup latency.
    > > >
    > > > Does this mean you believe "echo mem >/sys/power/state" is bad and
    > > > should be removed? Or "echo disk >/sys/power/state"? They pay no
    > >
    > > mem should be replaced by an idle suspend to ram mechanism
    >
    > Well, what about when I want the machine to suspend _regardless_ of whether
    > or not it's idle at the moment? That actually happens quite often to me. :-)

    Fair enough. Let's agree on a non ambigous terminology then:

    forced:

    suspend which you enforce via user interaction, which
    also implies that you risk losing wakeups depending on
    the hardware properties

    opportunistic:

    suspend driven from the idle context, which guarantees to
    not lose wakeups. Provided only when the hardware does
    provide the necessary capabilities.

    Thanks,

    tglx


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