Don't use global CPU masks (like "online" or "present") to
calculate type specific number of threads due systems with
mixed CPU types.
It's also necessary to check all thread_siblings maps to get the
highest number, because some threads (CPUs) may be disables, for
example old lscpu calculates number of threads from the cpu0 and
if you disable cpu0's sibling (cpu4):
CPU(s): 8
On-line CPU(s) list: 0-7
Thread(s) per core: 2 <---
Core(s) per socket: 4
Socket(s): 1
# chcpu --disable 4
CPU 4 disabled
CPU(s): 8
On-line CPU(s) list: 0-3,5-7
Off-line CPU(s) list: 4
Thread(s) per core: 1 <--- !
Core(s) per socket: 4
Socket(s): 1
because 'thread_siblings' contains only one thread for cpu0:
# cat /sys/devices/system/cpu/cpu{0,1,2,3,4,5,6,7}/topology/thread_siblings_list
0
1,5
2,6
3,7
cat: /sys/devices/system/cpu/cpu4/topology/thread_siblings_list: No such file or directory
1,5
2,6
3,7
Signed-off-by: Karel Zak <kzak@redhat.com>
* move structs definitions to header file
* define set of /proc/cpuinfo parsing patterns for cpu-type and for
CPUs
Signed-off-by: Karel Zak <kzak@redhat.com>
The current lscpu assumes that all CPUs in the system are the same.
Unfortunately this is not true. We need to split all internal CPUs
descriptions to CPU-type and CPU.
This patch add lscpu-cputype.c where will be CPU-type description --
mostly based on /proc/cpuinfo.
Signed-off-by: Karel Zak <kzak@redhat.com>
Karel Zak