在CentOS7 上编译运行 RT-test工具cyclictest 及patch kernel

来源：互联网发布：windows安装bugfree 编辑：程序博客网时间：2024/06/07 13:31

realtime 工具使用cyclictest ，我的linux环境是CentOS7

分为两部分：安装RT-test cyclictest ；给kernel 打patch

第一部分，下载安装Cyclictest , 我下载的是rt-test-1.0

# wget https:://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git

#cd rt-tests

[root@localhost RT_test]# cd rt-tests-1.0/
[root@localhost rt-tests-1.0]# ls

[root@localhost RT_test]# make all

此时编译报错:compile failure because numa.h can't be found

需要执行以下步骤

[root@localhost rt-tests-1.0]# yum install numactl-devel

再次make就compile成功

[root@localhost rt-tests-1.0]# cyclictest --help
cyclictest V 1.00
Usage:
cyclictest <options>

-a [CPUSET] --affinity Run thread #N on processor #N, if possible, or if CPUSET
given, pin threads to that set of processors in round-
robin order. E.g. -a 2 pins all threads to CPU 2,
but -a 3-5,0 -t 5 will run the first and fifth
threads on CPU (0),thread #2 on CPU 3, thread #3
on CPU 4, and thread #5 on CPU 5.
-A USEC --aligned=USEC align thread wakeups to a specific offset
-b USEC --breaktrace=USEC send break trace command when latency > USEC
-B --preemptirqs both preempt and irqsoff tracing (used with -b)
-c CLOCK --clock=CLOCK select clock
0 = CLOCK_MONOTONIC (default)

...

可以查看到各项命令，安装成功

开始使用工具：

[root@localhost rt-tests-1.0]# cyclictest -c CLOCK

报错：

Unable to changescheduling policy!

Probably missingcapabilities, either run as root or increase RLIMIT_RTPRIO limits.

这时需要给kernel 打 patch

部分二，下载相应kernel 版本及patch，kernel 和 patch 的版本应尽量相同，不然后续会出现其他问题

首先查看我的kernel版本

[root@localhost rt-tests-1.0]# uname -r
3.10.0-327.36.3.el7.x86_64

查看原先版本

[root@localhost rt-tests-1.0]# ls /boot/config-*

然后我选择下载3.12.66 版本，patch为patch-3.12.66-rt88.patch.gz

[root@localhost rt-tests-1.0]# wget https://www.kernel.org/pub/linux/kernel/projects/rt/3.12/patch-3.12.66-rt88.patch.gz
[root@localhost rt-tests-1.0]# wget https://www.kernel.org/pub/linux/kernel/v3.x/linux-3.12.66.tar.gz

[root@localhost rt-tests-1.0]# tar -xvzf linux-3.12.66.tar.gz

[root@localhost rt-tests-1.0]# ls
bld linux-3.12.66.tar.gz pmqtest signaltest
COPYING MAINTAINERS ptsematest sigwaittest
cyclictest Makefile README.markdown src
hackbench patch-3.12.66-rt88.patch.gz rt-migrate-test svsematest
hwlatdetect pip_stress RT_test
linux-3.12.66 pi_stress sendme
[root@localhost rt-tests-1.0]# cd linux-3.12.66/

开始patch

[root@localhost linux-3.12.66]# zcat ../patch-3.10.75-rt80.patch.gz | patch -p1

将原先存在的.config 文件写到kernel source

[root@localhost linux-3.12.66]# cp /boot/config-3.10.0-327.36.3.el7.x86_64 .config

compile 原始kernel，更改一些参数

[root@localhost linux-3.12.66]# make oldconfig

...

PreemptionModel

  1.NoForcedPreemption(Server)(PREEMPT_NONE)

>2.VoluntaryKernelPreemption(Desktop)(PREEMPT_VOLUNTARY)

  3.PreemptibleKernel(Low-LatencyDesktop)(PREEMPT__LL)(NEW)

  4.PreemptibleKernel(BasicRT)(PREEMPT_RTB)(NEW)

  5.FullyPreemptibleKernel(RT)(PREEMPT_RT_FULL)(NEW)

choice[1-5]:5

...

Debugpreemptiblekernel(DEBUG_PREEMPT)[Y/n/?](NEW)n

...

  Preemption-offLatencyTracer(PREEMPT_TRACER)[N/y/?](NEW)

  SchedulingLatencyTracer(SCHED_TRACER)[Y/n/?]y

    SchedulingLatencyHistogram(WAKEUP_LATENCY_HIST)[N/y/?](NEW)

  MissedTimerOffsetsHistogram(MISSED_TIMER_OFFSETS_HIST)[N/y/?](NEW)

...

EnableRCUpriorityboosting(RCU_BOOST)[Y/n/?](NEW)

  Real-timeprioritytoboostRCUreadersto(RCU_BOOST_PRIO)[1](NEW)

  MillisecondstodelayboostingafterRCUgrace-periodstart(RCU_BOOST_DELAY)[500](NEW)

...

#

#configurationwrittento.config

得到 .config 文件编译kernel

[root@localhost linux-3.12.66]# make

compile the modules which were marked in .config and install them in the required locations：

[root@localhost linux-3.12.66]# make modules_install install

Update the boot configuration for Grub

[root@localhost linux-3.12.66]# /usr/sbin/grub2-mkconfig -o /boot/grub2/grub.cfg

reboot 查看kernel version

[root@localhost linux-3.12.66]# uname -r
3.12.66-rt88

然后开始使用 cyclictest RT- test 工具

如果reboot 后还是启动原先版本，需要更改 /boot/grub2/grub.cfg 里面的参数，见上篇blog

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