Re: [patch] sched: disable task group re-weighting on the desktop

[Peter Zijlstra]

On Sat, Oct 10, 2015 at 03:22:49PM +0200, Mike Galbraith wrote:
> Ah, but now onward to interactivity...
>
> master, 8 groups of 1 (pert) vs desktop (mplayer BigBuckBunny-DivXPlusHD.mkv)
>   PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ P COMMAND
>  4068 root      20   0    8312    724    628 R 99.64 0.004   1:04.32 6 pert
>  4065 root      20   0    8312    744    648 R 99.45 0.005   1:04.92 5 pert
>  4071 root      20   0    8312    748    652 R 99.27 0.005   1:03.12 7 pert
>  4077 root      20   0    8312    840    744 R 98.72 0.005   1:01.46 3 pert
>  4074 root      20   0    8312    796    700 R 98.18 0.005   1:03.38 1 pert
>  4079 root      20   0    8312    720    624 R 97.99 0.004   1:01.45 4 pert
>  4062 root      20   0    8312    836    740 R 96.72 0.005   1:03.44 0 pert
>  4059 root      20   0    8312    720    624 R 94.16 0.004   1:04.92 2 pert
>  4082 root      20   0 1094400 154324  33592 S 4.197 0.954   0:02.69 0 mplayer
>  1029 root      20   0  465332 151540  40816 R 3.285 0.937   0:24.59 2 Xorg
>  1773 root      20   0  662592  73308  42012 S 2.007 0.453   0:12.84 5 konsole
>   771 root      20   0   11416   1964   1824 S 0.730 0.012   0:10.45 0 rngd
>  1722 root      20   0 2866772  65224  51152 S 0.365 0.403   0:03.44 2 kwin
>  1769 root      20   0  711684  54212  38020 S 0.182 0.335   0:00.39 1 kmix
>
> That is NOT good.  Mplayer and friends need more than that.  Interactivity
> is _horrible_, and buck is an unwatchable mess (no biggy, I know every frame).
>
> master+, 8 groups of 1 (pert) vs desktop (mplayer BigBuckBunny-DivXPlusHD.mkv)
>   PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ P COMMAND
>  4346 root      20   0    8312    756    660 R 99.20 0.005   0:59.89 5 pert
>  4349 root      20   0    8312    748    652 R 98.80 0.005   1:00.77 6 pert
>  4343 root      20   0    8312    720    624 R 94.81 0.004   1:02.11 2 pert
>  4331 root      20   0    8312    724    628 R 91.22 0.004   1:01.16 3 pert
>  4340 root      20   0    8312    720    624 R 91.22 0.004   1:01.06 7 pert
>  4328 root      20   0    8312    836    740 R 90.42 0.005   1:00.07 4 pert
>  4334 root      20   0    8312    756    660 R 87.82 0.005   0:59.84 1 pert
>  4337 root      20   0    8312    824    728 R 76.85 0.005   0:52.20 0 pert
>  4352 root      20   0 1058812 123876  33388 S 29.34 0.766   0:25.01 3 mplayer
>  1029 root      20   0  471168 156748  40316 R 22.36 0.969   0:42.23 3 Xorg
>  1773 root      20   0  663080  74176  42012 S 4.192 0.459   0:17.98 1 konsole
>   771 root      20   0   11416   1964   1824 R 1.198 0.012   0:13.45 0 rngd
>  1722 root      20   0 2866880  65340  51152 R 0.599 0.404   0:04.87 3 kwin
>  1788 root       9 -11  516744  11932   8536 S 0.599 0.074   0:01.01 0 pulseaudio
>  1733 root      20   0 3369480 141564  71776 S 0.200 0.875   0:05.51 1 plasma-desktop
>
> That's good.  Interactivity is fine...

But the patch is most horrible.. :/ It completely destroys everything
group scheduling is supposed to be.

What are these oink/pert things? Both spinners just with amusing names
to distinguish them?

Is the interactivity the same (horrible) at fe32d3cd5e8e (ie, before the
load tracking rewrite from Yuyang)?
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