[LU-8710] libcfs fails to install when some CPUs are disabled

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.10.0
• Severity: 3
• Assignee: Dmitry Eremin (Inactive)
• Reporter: Jinshan Xiong (Inactive)

Description

This issue was mentioned when Lustre performance was tested on ZFS.

To reproduce this, set a CPU offline:

[root@centos7 tests]# echo 0 >  /sys/devices/system/cpu/cpu0/online
[root@centos7 tests]# cat /sys/devices/system/cpu/cpu0/online 
0
[root@centos7 tests]# REFORMAT=yes OSTCOUNT=4 sh llmount.sh 
Stopping clients: centos7 /mnt/lustre (opts:)
Stopping clients: centos7 /mnt/lustre2 (opts:)
Loading modules from /Users/jxiong/srcs/pfl/lustre/tests/..
detected 4 online CPUs by sysfs
Force libcfs to create 2 CPU partitions
../libcfs/libcfs/libcfs options: 'cpu_npartitions=2'
insmod: ERROR: could not insert module /Users/jxiong/srcs/pfl/lustre/tests/../../libcfs/libcfs/libcfs.ko: Operation not permitted

Really easy to be reproduced.

Issue Links

• is duplicated by: LU-8703 rework CPU partition code