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    SubjectRe: dynamic-hz
    Hi!

    > > > > > > But that does not matter, right? Yes, one-shot timer will not fire
    > > > > > > exactly at right place, but as long as you are reading TSC and basing
    > > > > > > next shot on current time, error should not accumulate.
    > > > > >
    > > > > > As said in the rest of the message, the error (or some other error)
    > > > > > accumulates heavily today in the tick-loss compensation/adjustment
    > > > > > algorithm in arch/i386/kernel/timers/timer_tsc.c, so I'm sceptical
    > > > > > about
    > > > >
    > > > > I do not see how it should accumulate. Lets have working TSC. You want
    > > > > to emulate fixed-period timer with single-shot timer.
    > > >
    > > > Its caused by the fact that we don't use the the TSC to accumulate time.
    > > > We are instead interpolating between timer ticks and the TSC, where
    > >
    > > Yes, it was supposed to be simple, so that Andrea understands that
    > > there's nothing inherently broken with single-shot timers.
    >
    > Just a quick comment; The timer does not need to be single-shot
    > all the time, it can be a combination of continuous and variable
    > length timer, and it can change depending on the system load.
    >
    > We recently added VST support for OMAP in linux-omap bk tree, and
    > made some changes to the previous VST implementations that might be
    > of interest:
    ...
    > The patch in question is at:
    >
    > http://linux-omap.bkbits.net:8080/main/user=tmlind/patch@1.2016.4.18?nav=!-|index.html|stats|!+|index.html|ChangeSet@-12w|cset@1.2016.4.18

    Wow, that's basically 8 lines of code plus driver for new
    hardware... Is it really that simple?
    Pavel
    --
    People were complaining that M$ turns users into beta-testers...
    ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!
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