Re: [PATCH] powerpc/pseries: export timebase register sample in lparcfg
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From: Tyrel Datwyler <hidden>
Date: 2019-02-17 22:27:13
Ping? Any objections to this patch? A fix is already upstream in powerpc-utils to utilize the timebase value if available. -Tyrel On 12/08/2018 03:48 PM, Tyrel Datwyler wrote:
quoted hunk ↗ jump to hunk
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 <redacted> --- arch/powerpc/platforms/pseries/lparcfg.c | 1 + 1 file changed, 1 insertion(+)diff --git a/arch/powerpc/platforms/pseries/lparcfg.c b/arch/powerpc/platforms/pseries/lparcfg.c index 7944873..1ea73ec 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",