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

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Message-Id: <20241011123222.1282936-1-pierre.gondois@arm.com>
Date: Fri, 11 Oct 2024 14:32:21 +0200
From: Pierre Gondois <pierre.gondois@....com>
To: linux-kernel@...r.kernel.org
Cc: Hongyan Xia <hongyan.xia2@....com>,
	Chritian Loehle <christian.loehle@....com>,
	Pierre Gondois <pierre.gondois@....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: [PATCH 0/1] sched/fair: Update blocked averages on tick

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    |
| 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    |
+-------------+------+-------+-----------+------------+------------+

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 |
| 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 |
+-------------+------+-------+-----------+------------+---------+

Pierre Gondois (1):
  sched/fair: Update blocked averages on tick

 kernel/sched/fair.c | 21 ++++++++++++++++-----
 1 file changed, 16 insertions(+), 5 deletions(-)

-- 
2.25.1