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The Processor Utilzation of Resource Registers (PURR) provide an estimate of resources used by a cpu thread. Section 7.6 in Book III of the ISA outlines how to calculate the percentage of shared resources for threads using the ratio of the PURR delta and Timebase Register delta for a sampled period. This calculation is currently done erroneously by the lparstat tool from the powerpc-utils package. This patch exports the current timebase value after we sample the PURRs and exposes it to userspace accounting tools via /proc/ppc64/lparcfg. Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> |
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