linux-kernel - Re: [PATCH 0/1] sched/fair: Update blocked averages on tick

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Message-ID: <9b515d19-b4f7-45b6-a234-dd7fcdabeb6d@arm.com>
Date: Fri, 11 Oct 2024 14:45:15 +0200
From: Pierre Gondois <pierre.gondois@....com>
To: linux-kernel@...r.kernel.org
Cc: Hongyan Xia <hongyan.xia2@....com>,
 Chritian Loehle <christian.loehle@....com>, Ingo Molnar <mingo@...hat.com>,
 Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>,
 Vincent Guittot <vincent.guittot@...aro.org>,
 Dietmar Eggemann <dietmar.eggemann@....com>,
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>
Subject: Re: [PATCH 0/1] sched/fair: Update blocked averages on tick



On 10/11/24 14:32, Pierre Gondois wrote:
> The patch below was tested on a Pixel6 based on v6.8. The patch was
> then ported to v6.12-rc2. The energy consumption of the Pixel6 is:
> - measured using the phone's energy counters
> - estimated using util signals, cluster frequency and the Energy Model
> 
> An rt-app workload runs during 20s, 5 iterations. 'count' tasks are created
> with a utilization of 'util'%. Task's period is 16ms.
> 
> Measured energy:
> +-------------+------+-------+-----------+------------+------------+
> | granularity | util | count | base      | with patch | ratio      |
> +-------------+------+-------+-----------+------------+------------+
> | 0           | 5    | 8     |  5703.759 |  5624.371  | - 1.391    |
> | 0           | 5    | 16    | 15021.425 | 14540.839  | - 3.199    |
> | 0           | 5    | 24    | 30018.226 | 27046.899  | - 9.898    |
> | 0           | 10   | 8     | 12843.869 | 12346.898  | - 3.869    |
> | 0           | 10   | 16    | 45925.643 | 43081.072  | - 6.193    |

I forgot to trimm a configuration off the results. Please ignore the
lines with a 'granularity=2'.

8>
> | 2           | 5    | 8     |  6288.044 |  6174.609  | - 1.803    |
> | 2           | 5    | 16    | 15657.632 | 15037.596  | - 3.959    |
> | 2           | 5    | 24    | 31483.032 | 27205.665  | -13.58     |
> | 2           | 10   | 8     | 14003.121 | 12675.037  | - 9.484    |
> | 2           | 10   | 16    | 45005.382 | 42088.515  | - 6.481    |
<8
> +-------------+------+-------+-----------+------------+------------+
> 
> Computed energy:
> +-------------+------+-------+-----------+------------+---------+
> | granularity | util | count | base      | with patch | ratio   |
> +-------------+------+-------+-----------+------------+---------+
> | 0           | 5    | 8     | 2.5764e10 | 2.4581e10  | - 4.591 |
> | 0           | 5    | 16    | 7.0705e10 | 6.2580e10  | -11.490 |
> | 0           | 5    | 24    | 1.5034e11 | 1.1889e11  | -20.916 |
> | 0           | 10   | 8     | 4.7312e10 | 4.1573e10  | -12.131 |
> | 0           | 10   | 16    | 1.7860e11 | 1.4748e11  | -17.423 |

8>
> | 2           | 5    | 8     | 3.0811e10 | 2.8950e10  | - 6.040 |
> | 2           | 5    | 16    | 8.3871e10 | 7.1320e10  | -14.963 |
> | 2           | 5    | 24    | 1.3414e11 | 1.2771e11  | - 4.788 |
> | 2           | 10   | 8     | 5.8014e10 | 4.5861e10  | -20.949 |
> | 2           | 10   | 16    | 1.8283e11 | 1.6708e11  | - 8.613 |
<8
> +-------------+------+-------+-----------+------------+---------+
> 
> Pierre Gondois (1):
>    sched/fair: Update blocked averages on tick
> 
>   kernel/sched/fair.c | 21 ++++++++++++++++-----
>   1 file changed, 16 insertions(+), 5 deletions(-)
>