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SubjectRe: [PATCH 0/2 v4] sched: Rewrite per entity runnable load average tracking
Thanks a lot, Mike.

Ben asked for this test, but actually I don't know how to get pipe-test, still
not even after google it.

On Sun, Jul 20, 2014 at 07:46:23AM +0200, Mike Galbraith wrote:
> On Fri, 2014-07-18 at 07:26 +0800, Yuyang Du wrote:
> > Thanks to Morten, Ben, and Fengguang.
> >
> > v4 changes:
> >
> > - Insert memory barrier before writing cfs_rq->load_last_update_copy.
> > - Fix typos.
>
> My little desktop box says lovely minus signs have had their usual
> effect on the general case (cgroups enabled but not in use).
>
> pipe-test scheduling cross core - full fastpath
> 3.0.101-default 3.753363 usecs/loop -- avg 3.770737 530.4 KHz 1.000
> 3.1.10-default 3.723843 usecs/loop -- avg 3.716058 538.2 KHz 1.014
> 3.2.51-default 3.728060 usecs/loop -- avg 3.710372 539.0 KHz 1.016
> 3.3.8-default 3.906174 usecs/loop -- avg 3.900399 512.8 KHz .966
> 3.4.97-default 3.864158 usecs/loop -- avg 3.865281 517.4 KHz .975
> 3.5.7-default 3.967481 usecs/loop -- avg 3.962757 504.7 KHz .951
> 3.6.11-default 3.851186 usecs/loop -- avg 3.845321 520.1 KHz .980
> 3.7.10-default 3.777869 usecs/loop -- avg 3.776913 529.5 KHz .998
> 3.8.13-default 4.049927 usecs/loop -- avg 4.041905 494.8 KHz .932
> 3.9.11-default 3.973046 usecs/loop -- avg 3.974208 503.2 KHz .948
> 3.10.27-default 4.189598 usecs/loop -- avg 4.189298 477.4 KHz .900
> 3.11.10-default 4.293870 usecs/loop -- avg 4.297979 465.3 KHz .877
> 3.12.24-default 4.321570 usecs/loop -- avg 4.321961 462.8 KHz .872
> 3.13.11-default 4.137845 usecs/loop -- avg 4.134863 483.7 KHz .911
> 3.14.10-default 4.145348 usecs/loop -- avg 4.139987 483.1 KHz .910
> 3.15.4-default 4.355594 usecs/loop -- avg 4.351961 459.6 KHz .866
> 3.16.0-default 4.537279 usecs/loop -- avg 4.543532 440.2 KHz .829 1.000
> 3.16.0-default+v4 4.343542 usecs/loop -- avg 4.318803 463.1 KHz .873 1.052
>
> Extending max depth to 5, cost of depth++ seemingly did not change
> despite repeatable dip at depth = 3 (gremlins at play).
>
> mount -t cgroup o cpu none /cgroups
> mkdir -p /cgroups/a/b/c/d/e
>
> cgexec -g cpu:a pipe-test 1
> 3.16.0-default 5.016373 usecs/loop -- avg 5.021115 398.3 KHz 1.000
> 3.16.0-default+v4 4.978625 usecs/loop -- avg 4.977381 401.8 KHz 1.008
>
> cgexec -g cpu:a/b pipe-test 1
> 3.16.0-default 5.543566 usecs/loop -- avg 5.565475 359.4 KHz 1.000
> 3.16.0-default+v4 5.597399 usecs/loop -- avg 5.570444 359.0 KHz .998
>
> cgexec -g cpu:a/b/c pipe-test 1
> 3.16.0-default 6.092256 usecs/loop -- avg 6.094186 328.2 KHz 1.000
> 3.16.0-default+v4 6.294858 usecs/loop -- avg 6.338453 315.5 KHz .961
>
> cgexec -g cpu:a/b/c/d pipe-test 1
> 3.16.0-default 6.719044 usecs/loop -- avg 6.717118 297.7 KHz 1.000
> 3.16.0-default+v4 6.788559 usecs/loop -- avg 6.710102 298.1 KHz 1.001
>
> cgexec -g cpu:a/b/c/d/e pipe-test 1
> 3.16.0-default 7.186431 usecs/loop -- avg 7.194884 278.0 KHz 1.000
> 3.16.0-default+v4 7.368443 usecs/loop -- avg 7.250371 275.8 KHz .992
>

So the result is flat compared to before or a pass?

Thanks,
Yuyang


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