Mete Durlu 0209c11bc1 hyptop: Add real SMT utilization field ...

By using core utilization, thread utilization, and management
utilization, it is possible to determine how much capacity is left or
how much the real CPU SMT utilization is on lpars. Extending hyptop
with this new field provides useful information.

For more info about real CPU SMT utilization:
https://linux.mainframe.blog/smt_utilization/

Briefly:
ur = real SMT util
uc = core util
ut = thread util
um = *management util
s  = **speedup factor

	ur = ((uc * per_core_thr_count) - ut) / s + (ut - uc) + um

* management utilization:
logical core time spent on hypervisor instead of logical partition.
** speedup factor:
metric used to calculate the SMT utilization on that logical core. This
value varies depending on the workload and the machine generation due
to hardware optimization level.

Signed-off-by: Mete Durlu <meted@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

2023-07-20 21:45:16 +02:00

6.3 KiB

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