Re: [PATCH] cpufreq : powernv: Report Pmax throttling if capped below nominal frequency
From: Viresh Kumar <viresh.kumar@linaro.org>
Date: 2015-09-14 07:06:19
Also in:
linux-pm, lkml
On 14-09-15, 10:47, Shilpasri G Bhat wrote:
quoted hunk ↗ jump to hunk
Log a 'critical' message if the max frequency is reduced below nominal frequency. We already log 'info' message if the max frequency is capped below turbo frequency. CPU should guarantee atleast nominal frequency, but not turbo frequency in all system configurations and environments. So report the pmax throttling with severity when Pmax is dipped below nominal frequency. Signed-off-by: Shilpasri G Bhat <redacted> --- drivers/cpufreq/powernv-cpufreq.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index 64994e1..2d9ed42 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c@@ -327,8 +327,13 @@ static void powernv_cpufreq_throttle_check(void *data) if (chips[i].throttled) goto next; chips[i].throttled = true; - pr_info("CPU %d on Chip %u has Pmax reduced to %d\n", cpu, - chips[i].id, pmsr_pmax); + if (pmsr_pmax < powernv_pstate_info.nominal) + pr_crit("CPU %d on Chip %u has Pmax reduced to %d\n", + cpu, chips[i].id, pmsr_pmax); + else + pr_info("CPU %d on Chip %u has Pmax reduced to %d\n", + cpu, chips[i].id, pmsr_pmax);
I think the messages here can be improved a bit here to something
like:
pr_warn("CPU %d on Chip %u has Pmax reduced below nominal freq (%d < %d)\n",
cpu, chips[i].id, pmsr_pmax, powernv_pstate_info.nominal);
And similarly for the pr_info case as well.
--
viresh