Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1223836

[PATCH] cpufreq : powernv: Report Pmax throttling if capped below nominal frequency

Show all headers | View raw

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 <shilpa.bhat@linux.vnet.ibm.com>
---
 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);
+
 	} else if (chips[i].throttled) {
 		chips[i].throttled = false;
 		pr_info("CPU %d on Chip %u has Pmax restored to %d\n", cpu,
-- 
1.9.3

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] cpufreq : powernv: Report Pmax throttling if capped below nominal frequency Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2015-09-14 07:20 +0200
  Re: [PATCH] cpufreq : powernv: Report Pmax throttling if capped  below nominal frequency Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-14 09:10 +0200
  [PATCH v2] cpufreq : powernv: Report Pmax throttling if capped below nominal frequency Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> - 2015-09-14 10:50 +0200
    Re: [PATCH v2] cpufreq : powernv: Report Pmax throttling if capped  below nominal frequency Viresh Kumar <viresh.kumar@linaro.org> - 2015-09-14 12:30 +0200

csiph-web