Re: [PATCH v4] sched: automated per session task groups

Mike Galbraith
2010-12-03T06:48:34Z

On Thu, 2010-12-02 at 21:11 -0800, Paul Turner wrote:
> On 11/30/10 22:16, Mike Galbraith wrote:
> > On Tue, 2010-11-30 at 19:39 -0800, Paul Turner wrote:
> >> On 11/28/10 06:24, Mike Galbraith wrote:
> >>>
> >>> Something else is seriously wrong though. 36.1 with attached (plus
> >>> sched, cgroup: Fixup broken cgroup movement) works a treat, whereas
> >>> 37.git and tip with fixlet below both suck rocks. With a make -j40
> >>> running, wakeup-latency is showing latencies of>100ms, amarok skips,
> >>> mouse lurches badly.. generally horrid. Something went south.
> >>
> >> I'm looking at this.
> >>
> >> The share:share ratios looked good in static testing, but perhaps we
> >> need a little more wake-up boost to improve interactivity.
> >
> > Yeah, feels like a wakeup issue. I too did a (brief) static test, and
> > that looked ok.
> >
> > -Mike
> >
>
> Hey Mike,
>
> Does something like the below help?

Unfortunately not. For example, Xorg+mplayer needs (30 sec refresh)..

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
6487 root 20 0 366m 30m 5100 S 31 0.4 2:04.83 2 Xorg
4454 root 20 0 318m 28m 15m S 29 0.4 0:38.06 3 mplayer

..but gets this when a heavy kbuild is running along with them.

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ P COMMAND
6487 root 20 0 366m 30m 5136 S 12 0.4 2:25.98 1 Xorg
5595 root 20 0 318m 28m 15m R 8 0.4 0:09.31 3 mplayer

There are 4 task groups active at this time, Xorg, mplayer, Amarok and
konsole where the kbuild is running make -j40.

-Mike