0000324: [Anolis OS 7.7][aarch64]dmesg check, cacheinfo: Unable to detect cache hierarchy for CPU 0

编号	项目	分类	查看权限	报告日期	最后更新

0000324	Anolis OS 7	General	public	2021-10-13 16:14	2021-11-17 10:42

报告员	anolis_account	分派给	xingxin830
优先级	low	严重性	minor	出现频率	always
状态	assigned	处理状况	open
平台	aarch64	操作系统	Anolis OS	操作系统版本	7.7

标题	0000324: [Anolis OS 7.7][aarch64]dmesg check, cacheinfo: Unable to detect cache hierarchy for CPU 0
描述	开机启动后，dmesg日志中有如下warning日志： #dmesg -l warn -T cacheinfo: Unable to detect cache hierarchy for CPU 0 [重现概率] 必现 [重现环境] # uname -a Linux VM20210425-1 4.19.91-24.8.an7.aarch64 #1 SMP Sat Sep 18 16:58:48 CST 2021 aarch64 aarch64 aarch64 GNU/Linux [root@VM20210425-1]# cat /etc/os-release NAME="Anolis OS" VERSION="7.7" ID="anolis" ID_LIKE="rhel fedora centos" VERSION_ID="7.7" PRETTY_NAME="Anolis OS 7.7" ANSI_COLOR="0;31" HOME_URL="https://openanolis.cn/" BUG_REPORT_URL="https://bugs.openanolis.cn/" CENTOS_MANTISBT_PROJECT="CentOS-7" CENTOS_MANTISBT_PROJECT_VERSION="7" REDHAT_SUPPORT_PRODUCT="centos" REDHAT_SUPPORT_PRODUCT_VERSION="7" anolis8 上有同样BUG https://bugs.openanolis.cn/view.php?id=258
问题重现步骤	安装arm版本虚拟机后，进入环境，执行命令：dmesg -l warn -T
附注	anolis8 上有同样BUG https://bugs.openanolis.cn/view.php?id=258
标签	没加标签.

Shiloong 2021-10-28 10:58 开发人员 ~0000546	这个跟 NUMA 拓扑虚拟化有关, 不是什么大问题. 也请 @宝林帮忙看看. http://zhiyisun.github.io/2016/06/25/Get-Cache-Info-in-Linux-on-ARMv8-64-bit-Platform.html --- It is good to get a ARM 64-bit box and practice it on that. We can use qemu-system-aarch64 as an alternative. But you probably will say “There is no cache info in sysfs!”. That’s true. :-) Because there is no “next-level-cache” in machine virt’s default device tree. Function cache_shared_cpu_map_setup will return error. You can see below log from dmesg: "Unable to detect cache hierarchy from DT for CPU 0"