[ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon started" message

[ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon started" message

[Vishal Verma]

The above message was printed as an error, but it is just an
informational message. Change it to dbg().

Cc: QI Fuli <qi.fuli@jp.fujitsu.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 ndctl/monitor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ndctl/monitor.c b/ndctl/monitor.c
index d29e378..b44f946 100644
--- a/ndctl/monitor.c
+++ b/ndctl/monitor.c
@@ -660,7 +660,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
 			err((struct ndctl_ctx *)ctx, "daemon start failed\n");
 			goto out;
 		}
-		err((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");
+		dbg((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");
 	}
 
 	if (parse_monitor_event(&monitor, (struct ndctl_ctx *)ctx))
-- 
2.17.1

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[ndctl PATCH 2/2] ndctl, monitor: in daemon mode, exit successfully if no DIMMs are found

[Vishal Verma]

When we are running as a daemon, it is preferred to exit successfully
when no DIMMs are found. When running in the foreground, retain an error
return so that the user can be notified that nothing was found to
monitor.

In the longer term, replace this with a libudev uevent monitor that will
look for DIMM addition/removal events, and update the running monitor(s)
if the DIMMs match the active filter spec.

Link: https://bugs.launchpad.net/ubuntu/+source/ndctl/+bug/1781268
Reported-by: Andreas Hasenack <andreas@canonical.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: QI Fuli <qi.fuli@jp.fujitsu.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
---
 ndctl/monitor.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ndctl/monitor.c b/ndctl/monitor.c
index b44f946..7bf2ba7 100644
--- a/ndctl/monitor.c
+++ b/ndctl/monitor.c
@@ -681,8 +681,9 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
 		goto out;
 
 	if (!mfa.num_dimm) {
-		err((struct ndctl_ctx *)ctx, "no dimms to monitor\n");
-		rc = -ENXIO;
+		dbg((struct ndctl_ctx *)ctx, "no dimms to monitor\n");
+		if (!monitor.daemon)
+			rc = -ENXIO;
 		goto out;
 	}
 
-- 
2.17.1

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Re: [ndctl PATCH 2/2] ndctl, monitor: in daemon mode, exit successfully if no DIMMs are found

[Williams, Dan J]

On Thu, 2018-10-04 at 18:00 -0600, Vishal Verma wrote:
> When we are running as a daemon, it is preferred to exit successfully
> when no DIMMs are found. When running in the foreground, retain an
> error
> return so that the user can be notified that nothing was found to
> monitor.
> 
> In the longer term, replace this with a libudev uevent monitor that
> will
> look for DIMM addition/removal events, and update the running
> monitor(s)
> if the DIMMs match the active filter spec.
> 
> Link: https://bugs.launchpad.net/ubuntu/+source/ndctl/+bug/1781268
> Reported-by: Andreas Hasenack <andreas@canonical.com>
> Cc: Dan Williams <dan.j.williams@intel.com>

Looks good to me, if no one is sticking around to reap the error might
as well claim success.

Reviewed-by: Dan Williams <dan.j.williams@intel.com>

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RE: [ndctl PATCH 2/2] ndctl, monitor: in daemon mode, exit successfully if no DIMMs are found

[Qi, Fuli]

> -----Original Message-----
> From: Vishal Verma [mailto:vishal.l.verma@intel.com]
> Sent: Friday, October 5, 2018 9:01 AM
> To: linux-nvdimm@lists.01.org
> Cc: Qi, Fuli/斉 福利 <qi.fuli@jp.fujitsu.com>; Andreas Hasenack
> <andreas@canonical.com>; Vishal Verma <vishal.l.verma@intel.com>; Dan
> Williams <dan.j.williams@intel.com>
> Subject: [ndctl PATCH 2/2] ndctl, monitor: in daemon mode, exit successfully if no
> DIMMs are found
> 
> When we are running as a daemon, it is preferred to exit successfully when no DIMMs
> are found. When running in the foreground, retain an error return so that the user can
> be notified that nothing was found to monitor.
> 
> In the longer term, replace this with a libudev uevent monitor that will look for DIMM
> addition/removal events, and update the running monitor(s) if the DIMMs match the
> active filter spec.
> 
> Link: https://bugs.launchpad.net/ubuntu/+source/ndctl/+bug/1781268
> Reported-by: Andreas Hasenack <andreas@canonical.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Cc: QI Fuli <qi.fuli@jp.fujitsu.com>
> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
> ---
>  ndctl/monitor.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/ndctl/monitor.c b/ndctl/monitor.c index b44f946..7bf2ba7 100644
> --- a/ndctl/monitor.c
> +++ b/ndctl/monitor.c
> @@ -681,8 +681,9 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
>  		goto out;
> 
>  	if (!mfa.num_dimm) {
> -		err((struct ndctl_ctx *)ctx, "no dimms to monitor\n");
> -		rc = -ENXIO;
> +		dbg((struct ndctl_ctx *)ctx, "no dimms to monitor\n");
> +		if (!monitor.daemon)
> +			rc = -ENXIO;
>  		goto out;
>  	}
> 
> --
> 2.17.1
> 

Looks good to me.

Thank you very much,
QI Fuli

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Re: [ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon started" message

[Williams, Dan J]

On Thu, 2018-10-04 at 18:00 -0600, Vishal Verma wrote:
> The above message was printed as an error, but it is just an
> informational message. Change it to dbg().
> 
> Cc: QI Fuli <qi.fuli@jp.fujitsu.com>
> Cc: Dan Williams <dan.j.williams@intel.com>

Reviewed-by: Dan Williams <dan.j.williams@intel.com>

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Re: [ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon started" message

[Yasunori Goto]

Hi, Vishal-san,

> The above message was printed as an error, but it is just an
> informational message. Change it to dbg().

Hmmmmmmm.

When I was a engineer for trouble-shooting of customer's Linux system,
the starting time and the ending time of any daemon was very helpful
for investigating their trouble.

So, I think it is not only for developer, but also it is essential for
trouble-shooter for custmer support. 
(It may be also same with system operator)


> 
> Cc: QI Fuli <qi.fuli@jp.fujitsu.com>
> Cc: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
> ---
>  ndctl/monitor.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/ndctl/monitor.c b/ndctl/monitor.c
> index d29e378..b44f946 100644
> --- a/ndctl/monitor.c
> +++ b/ndctl/monitor.c
> @@ -660,7 +660,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
>  			err((struct ndctl_ctx *)ctx, "daemon start failed\n");
>  			goto out;
>  		}
> -		err((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");
> +		dbg((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");

Though I agree its message is not "error" certainly,
I would like to keep it as normal status level message.

Thanks,
---
Yasunori Goto



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Re: [ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon started" message

[Dan Williams]

On Thu, Oct 4, 2018 at 9:09 PM Yasunori Goto <y-goto@jp.fujitsu.com> wrote:
>
> Hi, Vishal-san,
>
> > The above message was printed as an error, but it is just an
> > informational message. Change it to dbg().
>
> Hmmmmmmm.
>
> When I was a engineer for trouble-shooting of customer's Linux system,
> the starting time and the ending time of any daemon was very helpful
> for investigating their trouble.
>
> So, I think it is not only for developer, but also it is essential for
> trouble-shooter for custmer support.
> (It may be also same with system operator)
>
>
> >
> > Cc: QI Fuli <qi.fuli@jp.fujitsu.com>
> > Cc: Dan Williams <dan.j.williams@intel.com>
> > Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
> > ---
> >  ndctl/monitor.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/ndctl/monitor.c b/ndctl/monitor.c
> > index d29e378..b44f946 100644
> > --- a/ndctl/monitor.c
> > +++ b/ndctl/monitor.c
> > @@ -660,7 +660,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
> >                       err((struct ndctl_ctx *)ctx, "daemon start failed\n");
> >                       goto out;
> >               }
> > -             err((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");
> > +             dbg((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");
>
> Though I agree its message is not "error" certainly,
> I would like to keep it as normal status level message.
>

Sounds good to me.
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RE: [ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon started" message

[Qi, Fuli]

> -----Original Message-----
> From: Linux-nvdimm [mailto:linux-nvdimm-bounces@lists.01.org] On Behalf Of Dan
> Williams
> Sent: Friday, October 5, 2018 1:24 PM
> To: Gotou, Yasunori/五島 康文 <y-goto@jp.fujitsu.com>
> Cc: andreas@canonical.com; linux-nvdimm <linux-nvdimm@lists.01.org>
> Subject: Re: [ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon
> started" message
> 
> On Thu, Oct 4, 2018 at 9:09 PM Yasunori Goto <y-goto@jp.fujitsu.com> wrote:
> >
> > Hi, Vishal-san,
> >
> > > The above message was printed as an error, but it is just an
> > > informational message. Change it to dbg().
> >
> > Hmmmmmmm.
> >
> > When I was a engineer for trouble-shooting of customer's Linux system,
> > the starting time and the ending time of any daemon was very helpful
> > for investigating their trouble.
> >
> > So, I think it is not only for developer, but also it is essential for
> > trouble-shooter for custmer support.
> > (It may be also same with system operator)
> >
> >
> > >
> > > Cc: QI Fuli <qi.fuli@jp.fujitsu.com>
> > > Cc: Dan Williams <dan.j.williams@intel.com>
> > > Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
> > > ---
> > >  ndctl/monitor.c | 2 +-
> > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > >
> > > diff --git a/ndctl/monitor.c b/ndctl/monitor.c index
> > > d29e378..b44f946 100644
> > > --- a/ndctl/monitor.c
> > > +++ b/ndctl/monitor.c
> > > @@ -660,7 +660,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
> > >                       err((struct ndctl_ctx *)ctx, "daemon start failed\n");
> > >                       goto out;
> > >               }
> > > -             err((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");
> > > +             dbg((struct ndctl_ctx *)ctx, "ndctl monitor daemon
> > > + started\n");
> >
> > Though I agree its message is not "error" certainly, I would like to
> > keep it as normal status level message.
> >
> 
> Sounds good to me.

In my original idea, I just wanted to log the "daemon started" message.
After thinking more about it, I agree that the message is not at "error" level.
However, considering this message will be helpful for some users like system operators,
how about changing this message level to "info" and meanwhile changing the default log level to "LOG_INFO" as following?

diff --git a/ndctl/monitor.c b/ndctl/monitor.c
index d29e378..10866b6 100644
--- a/ndctl/monitor.c
+++ b/ndctl/monitor.c
@@ -628,7 +628,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
        if (monitor.verbose)
                ndctl_set_log_priority((struct ndctl_ctx *)ctx, LOG_DEBUG);
        else
-               ndctl_set_log_priority((struct ndctl_ctx *)ctx, LOG_NOTICE);
+               ndctl_set_log_priority((struct ndctl_ctx *)ctx, LOG_INFO);

        rc = read_config_file((struct ndctl_ctx *)ctx, &monitor, &param);
        if (rc)
@@ -657,7 +657,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
                if (!monitor.log || strncmp(monitor.log, "./", 2) == 0)
                        ndctl_set_log_fn((struct ndctl_ctx *)ctx, log_syslog);
                if (daemon(0, 0) != 0) {
-                       err((struct ndctl_ctx *)ctx, "daemon start failed\n");
+                       info((struct ndctl_ctx *)ctx, "daemon start failed\n");
                        goto out;
                }
                err((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");

Thank you very much,
QI Fuli
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RE: [ndctl PATCH 1/2] ndctl, monitor: fix the severity of the "daemon started" message

[Qi, Fuli]

> > > >
> > >
> > > Sounds good to me.
> >
> > In my original idea, I just wanted to log the "daemon started" message.
> > After thinking more about it, I agree that the message is not at "error" level.
> > However, considering this message will be helpful for some users like system
> operators,
> > how about changing this message level to "info" and meanwhile changing the
> default log level to "LOG_INFO" as following?
> >
> > diff --git a/ndctl/monitor.c b/ndctl/monitor.c
> > index d29e378..10866b6 100644
> > --- a/ndctl/monitor.c
> > +++ b/ndctl/monitor.c
> > @@ -628,7 +628,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
> >         if (monitor.verbose)
> >                 ndctl_set_log_priority((struct ndctl_ctx *)ctx, LOG_DEBUG);
> >         else
> > -               ndctl_set_log_priority((struct ndctl_ctx *)ctx, LOG_NOTICE);
> > +               ndctl_set_log_priority((struct ndctl_ctx *)ctx, LOG_INFO);
> >
> >         rc = read_config_file((struct ndctl_ctx *)ctx, &monitor, &param);
> >         if (rc)
> > @@ -657,7 +657,7 @@ int cmd_monitor(int argc, const char **argv, void *ctx)
> >                 if (!monitor.log || strncmp(monitor.log, "./", 2) == 0)
> >                         ndctl_set_log_fn((struct ndctl_ctx *)ctx, log_syslog);
> >                 if (daemon(0, 0) != 0) {
> > -                       err((struct ndctl_ctx *)ctx, "daemon start failed\n");
> > +                       info((struct ndctl_ctx *)ctx, "daemon start failed\n");
> >                         goto out;
> >                 }
> >                 err((struct ndctl_ctx *)ctx, "ndctl monitor daemon started\n");
> 
> Yes, this looks good to me. Will you send a proper patch for this, and I
> can replace my patch with yours.
> 
> Thanks,
> 	-Vishal
> 

Ok, I will send a patch.

> >
> > Thank you very much,
> > QI Fuli
> > > _______________________________________________
> > > Linux-nvdimm mailing list
> > > Linux-nvdimm@lists.01.org
> > > https://lists.01.org/mailman/listinfo/linux-nvdimm
> >
> >
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