linux-kernel - [PATCH-RT sched v2 0/2] Optimize the RT group scheduling

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Date: Sat, 29 Jun 2024 19:28:10 +0800
From: Xavier <xavier_qy@....com>
To: mingo@...hat.com,
	peterz@...radead.org,
	juri.lelli@...hat.com,
	vincent.guittot@...aro.org
Cc: dietmar.eggemann@....com,
	rostedt@...dmis.org,
	bsegall@...gle.com,
	mgorman@...e.de,
	bristot@...hat.com,
	vschneid@...hat.com,
	linux-kernel@...r.kernel.org,
	Xavier <xavier_qy@....com>
Subject: [PATCH-RT sched v2 0/2] Optimize the RT group scheduling

Hi all,

Patch v2 fix the issues arising from disabling the CONFIG_RT_GROUP_SCHED
macro during compilation.

>The first patch optimizes the enqueue and dequeue of rt_se, the strategy
>employs a bottom-up removal approach.
>The second patch provides validation for the efficiency improvements made
>by patch 1. The test case count the number of infinite loop executions for
>all threads.
>
>		origion          optimized
>
>	   10242794134		10659512784
>	   13650210798		13555924695
>	   12953159254		13733609646
>	   11888973428		11742656925
>	   12791797633		13447598015
>	   11451270205		11704847480
>	   13335320346		13858155642
>	   10682907328		10513565749
>	   10173249704		10254224697
>	   8309259793		8893668653
>
>avg    11547894262      11836376429
>
>Run two QEMU emulators simultaneously, one running the original kernel and the
>other running the optimized kernel, and compare the average of the results over
>10 runs. After optimizing, the number of iterations in the infinite loop increased
>by approximately 2.5%.

Kindly review.

Xavier (2):
  RT SCHED: Optimize the enqueue and dequeue operations for rt_se
  RT test: Adding test cases for RT group scheduling

 MAINTAINERS                                   |   7 +
 kernel/sched/debug.c                          |  50 ++++
 kernel/sched/rt.c                             | 278 +++++++++++++++---
 kernel/sched/sched.h                          |   1 +
 tools/testing/selftests/sched/Makefile        |   4 +-
 tools/testing/selftests/sched/deadloop.c      | 192 ++++++++++++
 .../selftests/sched/rt_group_sched_test.sh    | 119 ++++++++
 7 files changed, 609 insertions(+), 42 deletions(-)
 create mode 100644 tools/testing/selftests/sched/deadloop.c
 create mode 100755 tools/testing/selftests/sched/rt_group_sched_test.sh

-- 
2.45.2