From: Tyrel Datwyler Date: Sat, 8 Dec 2018 23:48:27 +0000 (-0600) Subject: powerpc/pseries: export timebase register sample in lparcfg X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=9f3ba362d84786af8e1ab36a32fb337882b8648c;p=linux.git powerpc/pseries: export timebase register sample in lparcfg 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 Signed-off-by: Michael Ellerman --- diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c index 794487313cc8d..e73c7e30efe63 100644 --- a/arch/powerpc/platforms/pseries/lparcfg.c +++ b/arch/powerpc/platforms/pseries/lparcfg.c @@ -475,6 +475,7 @@ static int pseries_lparcfg_data(struct seq_file *m, void *v) splpar_dispatch_data(m); seq_printf(m, "purr=%ld\n", get_purr()); + seq_printf(m, "tbr=%ld\n", mftb()); } else { /* non SPLPAR case */ seq_printf(m, "system_active_processors=%d\n",