On 01/03/2017 11:37 AM, Al Stone wrote: > On 12/14/2016 06:06 PM, Prashanth Prakash wrote: >> This patch-set adds few additional sysfs entries to expose the >> performance capabilities of each CPU. The performance capabilities >> include highest perf, lowest perf, nominal perf and lowest >> non-linear perf. See 8.4.7.1 for ACPI 6.1 spec for details on >> these capabilities. >> >> cppc_cpufreq driver operates in KHz scale whereas the delivered >> performance computed in userspace will be in abstract CPPC scale, so >> exposing perf capabilities should allow userspace to figure out the >> conversion factor from CPPC scale to KHz. >> >> Prashanth Prakash (2): >> ACPI / CPPC: read all perf caps in a single cppc read command >> ACPI / CPPC: add sysfs entries for CPPC perf capabilities >> >> drivers/acpi/cppc_acpi.c | 164 ++++++++++++++++++++++++++++++----------------- >> include/acpi/cppc_acpi.h | 3 +- >> 2 files changed, 107 insertions(+), 60 deletions(-) >> > > Nice addition, Prashanth. I had thought about doing this, but got distracted. > Thanks for following through :). I have not had a chance to test these yet, but > will do so as soon as I can; my initial review is pretty positive, though. > Sorry for the delays :(. These work for me, on an APM Mustang: # ls feedback_ctrs lowest_non_linear_perf nominal_perf wraparound_time highest_perf lowest_perf reference_perf # for ii in *; do echo $ii `cat $ii`; done feedback_ctrs ref:195829033861120 del:1261303045816320 highest_perf 1000 lowest_non_linear_perf 250 lowest_perf 250 nominal_perf 1000 reference_perf 1000 wraparound_time 18446744073709551615 Tested-by: Al Stone <ahs3@xxxxxxxxxx> -- ciao, al ----------------------------------- Al Stone Software Engineer Red Hat, Inc. ahs3@xxxxxxxxxx ----------------------------------- -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
