linux-kernel - [PATCH 2/2] drivers: devfreq: add tracing for scheduling work

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1550170676-14173-3-git-send-email-l.luba@partner.samsung.com>
Date:   Thu, 14 Feb 2019 19:57:56 +0100
From:   Lukasz Luba <l.luba@...tner.samsung.com>
To:     linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     b.zolnierkie@...sung.com, myungjoo.ham@...sung.com,
        cw00.choi@...sung.com, kyungmin.park@...sung.com,
        m.szyprowski@...sung.com, s.nawrocki@...sung.com, mka@...omium.org,
        rostedt@...dmis.org, mingo@...hat.com,
        Lukasz Luba <l.luba@...tner.samsung.com>
Subject: [PATCH 2/2] drivers: devfreq: add tracing for scheduling work

This patch add basic tracing of the devfreq workqueue and delayed work.
It aims to capture changes of the polling intervals and device state.

Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
Signed-off-by: Lukasz Luba <l.luba@...tner.samsung.com>
---
 drivers/devfreq/devfreq.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c
index 0ae3de7..c9714fd 100644
--- a/drivers/devfreq/devfreq.c
+++ b/drivers/devfreq/devfreq.c
@@ -29,6 +29,9 @@
 #include <linux/of.h>
 #include "governor.h"
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/devfreq.h>
+
 static struct class *devfreq_class;
 
 /*
@@ -394,6 +397,11 @@ static void devfreq_monitor(struct work_struct *work)
 	queue_delayed_work(devfreq_wq, &devfreq->work,
 				msecs_to_jiffies(devfreq->profile->polling_ms));
 	mutex_unlock(&devfreq->lock);
+
+	trace_devfreq_monitor(dev_name(&devfreq->dev), devfreq->previous_freq,
+			      devfreq->profile->polling_ms,
+			      devfreq->last_status.busy_time,
+			      devfreq->last_status.total_time);
 }
 
 /**
-- 
2.7.4