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Date: Mon, 14 Feb 2022 16:39:33 +0100
From: Daniel Bristot de Oliveira <bristot@...nel.org>
To: Guenter Roeck <linux@...ck-us.net>,
Steven Rostedt <rostedt@...dmis.org>
Cc: Jonathan Corbet <corbet@....net>, Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Will Deacon <will@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Marco Elver <elver@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Shuah Khan <skhan@...uxfoundation.org>,
Gabriele Paoloni <gpaoloni@...hat.com>,
Juri Lelli <juri.lelli@...hat.com>,
Clark Williams <williams@...hat.com>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-trace-devel@...r.kernel.org,
Wim Van Sebroeck <wim@...ux-watchdog.org>
Subject: Re: [RFC V2 17/21] watchdog/dev: Add tracepoints
On 2/14/22 15:57, Guenter Roeck wrote:
> On 2/14/22 02:45, Daniel Bristot de Oliveira wrote:
>> Add a set of tracepoints, enabling the observability of the watchdog
>> device interactions with user-space.
>>
>> The events are:
>> watchdog:watchdog_open
>> watchdog:watchdog_close
>> watchdog:watchdog_start
>> watchdog:watchdog_stop
>> watchdog:watchdog_set_timeout
>> watchdog:watchdog_ping
>> watchdog:watchdog_nowayout
>> watchdog:watchdog_set_keep_alive
>> watchdog:watchdog_keep_alive
>>
>> Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>
>> Cc: Guenter Roeck <linux@...ck-us.net>
>> Cc: Jonathan Corbet <corbet@....net>
>> Cc: Steven Rostedt <rostedt@...dmis.org>
>> Cc: Ingo Molnar <mingo@...hat.com>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Peter Zijlstra <peterz@...radead.org>
>> Cc: Will Deacon <will@...nel.org>
>> Cc: Catalin Marinas <catalin.marinas@....com>
>> Cc: Marco Elver <elver@...gle.com>
>> Cc: Dmitry Vyukov <dvyukov@...gle.com>
>> Cc: "Paul E. McKenney" <paulmck@...nel.org>
>> Cc: Shuah Khan <skhan@...uxfoundation.org>
>> Cc: Gabriele Paoloni <gpaoloni@...hat.com>
>> Cc: Juri Lelli <juri.lelli@...hat.com>
>> Cc: Clark Williams <williams@...hat.com>
>> Cc: linux-doc@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Cc: linux-trace-devel@...r.kernel.org
>> Signed-off-by: Daniel Bristot de Oliveira <bristot@...nel.org>
>> ---
>> drivers/watchdog/watchdog_dev.c | 41 ++++++++++++-
>> include/linux/watchdog.h | 7 +--
>> include/trace/events/watchdog.h | 103 ++++++++++++++++++++++++++++++++
>> 3 files changed, 142 insertions(+), 9 deletions(-)
>> create mode 100644 include/trace/events/watchdog.h
>>
>> diff --git a/drivers/watchdog/watchdog_dev.c b/drivers/watchdog/watchdog_dev.c
>> index 3a3d8b5c7ad5..0beeac5d4541 100644
>> --- a/drivers/watchdog/watchdog_dev.c
>> +++ b/drivers/watchdog/watchdog_dev.c
>> @@ -44,6 +44,9 @@
>> #include <linux/watchdog.h> /* For watchdog specific items */
>> #include <linux/uaccess.h> /* For copy_to_user/put_user/... */
>> +#define CREATE_TRACE_POINTS
>> +#include <trace/events/watchdog.h>
>> +
>> #include "watchdog_core.h"
>> #include "watchdog_pretimeout.h"
>> @@ -130,9 +133,11 @@ static inline void watchdog_update_worker(struct
>> watchdog_device *wdd)
>> if (watchdog_need_worker(wdd)) {
>> ktime_t t = watchdog_next_keepalive(wdd);
>> - if (t > 0)
>> + if (t > 0) {
>> hrtimer_start(&wd_data->timer, t,
>> HRTIMER_MODE_REL_HARD);
>> + trace_watchdog_set_keep_alive(wdd, ktime_to_ms(t));
>> + }
>> } else {
>> hrtimer_cancel(&wd_data->timer);
>> }
>> @@ -149,14 +154,16 @@ static int __watchdog_ping(struct watchdog_device *wdd)
>> now = ktime_get();
>> if (ktime_after(earliest_keepalive, now)) {
>> - hrtimer_start(&wd_data->timer,
>> - ktime_sub(earliest_keepalive, now),
>> + ktime_t t = ktime_sub(earliest_keepalive, now);
>
> I am quite sure this line creates a checkpatch warning.
right, I will fix it.
>
>> + hrtimer_start(&wd_data->timer, t,
>> HRTIMER_MODE_REL_HARD);
>> + trace_watchdog_set_keep_alive(wdd, ktime_to_ms(t));
>> return 0;
>> }
>> wd_data->last_hw_keepalive = now;
>> + trace_watchdog_ping(wdd);
>> if (wdd->ops->ping)
>> err = wdd->ops->ping(wdd); /* ping the watchdog */
>> else
>> @@ -215,6 +222,7 @@ static void watchdog_ping_work(struct kthread_work *work)
>> wd_data = container_of(work, struct watchdog_core_data, work);
>> mutex_lock(&wd_data->lock);
>> + trace_watchdog_keep_alive(wd_data->wdd);
>> if (watchdog_worker_should_ping(wd_data))
>> __watchdog_ping(wd_data->wdd);
>> mutex_unlock(&wd_data->lock);
>> @@ -252,6 +260,8 @@ static int watchdog_start(struct watchdog_device *wdd)
>> set_bit(_WDOG_KEEPALIVE, &wd_data->status);
>> + trace_watchdog_start(wdd);
>> +
>> started_at = ktime_get();
>> if (watchdog_hw_running(wdd) && wdd->ops->ping) {
>> err = __watchdog_ping(wdd);
>> @@ -298,6 +308,7 @@ static int watchdog_stop(struct watchdog_device *wdd)
>> return -EBUSY;
>> }
>> + trace_watchdog_stop(wdd);
>> if (wdd->ops->stop) {
>> clear_bit(WDOG_HW_RUNNING, &wdd->status);
>> err = wdd->ops->stop(wdd);
>> @@ -370,6 +381,7 @@ static int watchdog_set_timeout(struct watchdog_device *wdd,
>> if (watchdog_timeout_invalid(wdd, timeout))
>> return -EINVAL;
>> + trace_watchdog_set_timeout(wdd, timeout);
>> if (wdd->ops->set_timeout) {
>> err = wdd->ops->set_timeout(wdd, timeout);
>> } else {
>> @@ -432,6 +444,23 @@ static int watchdog_get_timeleft(struct watchdog_device
>> *wdd,
>> return 0;
>> }
>> +/*
>
> /** ?
yep, I will fix this too.
>> + * watchdog_set_nowayout - set nowaout bit
>> + * @wdd: The watchdog device to set nowayoutbit
>> + * @nowayout A boolean on/off switcher
>> + *
>> + * If nowayout boolean is true, the nowayout option is set. No action is
>> + * taken if nowayout is false.
>> + */
>> +void watchdog_set_nowayout(struct watchdog_device *wdd, bool nowayout)
>> +{
>> + if (nowayout) {
>> + set_bit(WDOG_NO_WAY_OUT, &wdd->status);
>> + trace_watchdog_nowayout(wdd);
>> + }
>> +}
>> +EXPORT_SYMBOL(watchdog_set_nowayout);
>> +
>> #ifdef CONFIG_WATCHDOG_SYSFS
>> static ssize_t nowayout_show(struct device *dev, struct device_attribute *attr,
>> char *buf)
>> @@ -457,6 +486,7 @@ static ssize_t nowayout_store(struct device *dev, struct
>> device_attribute *attr,
>> /* nowayout cannot be disabled once set */
>> if (test_bit(WDOG_NO_WAY_OUT, &wdd->status) && !value)
>> return -EPERM;
>> +
>> watchdog_set_nowayout(wdd, value);
>> return len;
>> }
>> @@ -858,6 +888,8 @@ static int watchdog_open(struct inode *inode, struct file
>> *file)
>> goto out_clear;
>> }
>> + trace_watchdog_open(wdd);
>> +
>> err = watchdog_start(wdd);
>> if (err < 0)
>> goto out_mod;
>> @@ -880,6 +912,7 @@ static int watchdog_open(struct inode *inode, struct file
>> *file)
>> return stream_open(inode, file);
>> out_mod:
>> + trace_watchdog_close(wdd);
>> module_put(wd_data->wdd->ops->owner);
>> out_clear:
>> clear_bit(_WDOG_DEV_OPEN, &wd_data->status);
>> @@ -940,6 +973,7 @@ static int watchdog_release(struct inode *inode, struct
>> file *file)
>> /* make sure that /dev/watchdog can be re-opened */
>> clear_bit(_WDOG_DEV_OPEN, &wd_data->status);
>> + trace_watchdog_close(wdd);
>> done:
>> running = wdd && watchdog_hw_running(wdd);
>> mutex_unlock(&wd_data->lock);
>> @@ -952,6 +986,7 @@ static int watchdog_release(struct inode *inode, struct
>> file *file)
>> module_put(wd_data->cdev.owner);
>> put_device(&wd_data->dev);
>> }
>> +
>
> You may disagree with current empty lines or other cosmetics, but that is not an
> acceptable reason for such changes. Please drop this change and the similar change
> further up.
It was miss attention from my side. I probably did some changes around these
lines in an early patch version but forgot to remove those "+<empty>" changes.
My bad. I will remove them.
Thanks, Guenter!
-- Daniel
> Guenter
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