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    SubjectRe: [linux-pm] [PATCH 0/8] Suspend block api (version 6)
    Date
    On Thursday 13 May 2010, Tony Lindgren wrote:
    > * Alan Stern <stern@rowland.harvard.edu> [100513 07:11]:
    > > On Wed, 12 May 2010, Paul Walmsley wrote:
    > >
    > > > Hello,
    > > >
    > > > Some general comments on the suspend blockers/wakelock/opportunistic
    > > > suspend v6 patch series, posted here:
    > > >
    > > > https://lists.linux-foundation.org/pipermail/linux-pm/2010-April/025146.html
    > > >
    > > > The comments below are somewhat telegraphic in the interests of
    > > > readability - more specific comments to follow in later E-mails. I am
    > > > indebted to those of us who discussed these issues at LPC last year and
    > > > ELC this year for several stimulating discussions.
    > > >
    > > > There are several general problems with the design of opportunistic
    > > > suspend and suspend-blocks.
    > > >
    > > > 1. The opportunistic suspend code bypasses existing Linux kernel code,
    > > > such as timers and the scheduler, that indicates when code
    > > > needs to run, and when the system is idle.
    > >
    > > Whoa! That's not my understanding at all.
    > >
    > > As I see it, opportunistic suspend doesn't bypass any code that isn't
    > > already bypassed by the existing suspend code. Users can do
    > >
    > > echo mem >/sys/power/state
    > >
    > > whenever they want, without regard to kernel timers and the scheduler
    > > (other than the fact that the user's thread must be running in order to
    > > carry out the write, of course).
    >
    > The difference between echo mem > /sys/power/state and suspend blocks
    > is that with suspend blocks the system keeps running.

    Care to elaborate?

    Rafael


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