Oct. 19, 2015
10 a.m.
All, I have been looking at sysfs cpu side code. Had a quick question. On my x86 box: #ls /sys/devices/system/cpu/ I see 4 cpus plus a few more fields such as online/present/possible etc. This come from drivers/base/cpu.c. My question here is, in each of those cpu0-3 folders, there's file by name online which one can use to disable/enable cpu using cpumask. Could someone point me to that code, I could not really pin point to where exactly this attribute is defined. Am just exploring cpu hotplug feature. Thanks.