* [PATCH] device-mapper: use dynamic debug instead of compile-time config option
@ 2020-05-13 7:08 Hannes Reinecke
2020-05-13 9:41 ` Damien Le Moal
0 siblings, 1 reply; 7+ messages in thread
From: Hannes Reinecke @ 2020-05-13 7:08 UTC (permalink / raw)
To: Mike Snitzer; +Cc: dm-devel
Switch to use dynamic debug to avoid having recompile the kernel
just to enable debugging messages.
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
include/linux/device-mapper.h | 7 +------
1 file changed, 1 insertion(+), 6 deletions(-)
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index e2d506dd805e..3d4365fd3001 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -556,13 +556,8 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
#define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
#define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
-#ifdef CONFIG_DM_DEBUG
-#define DMDEBUG(fmt, ...) printk(KERN_DEBUG DM_FMT(fmt), ##__VA_ARGS__)
+#define DMDEBUG(fmt, ...) pr_debug(DM_FMT(fmt), ##__VA_ARGS__)
#define DMDEBUG_LIMIT(fmt, ...) pr_debug_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
-#else
-#define DMDEBUG(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
-#define DMDEBUG_LIMIT(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
-#endif
#define DMEMIT(x...) sz += ((sz >= maxlen) ? \
0 : scnprintf(result + sz, maxlen - sz, x))
--
2.25.0
^ permalink raw reply related [flat|nested] 7+ messages in thread
* Re: [PATCH] device-mapper: use dynamic debug instead of compile-time config option
2020-05-13 7:08 [PATCH] device-mapper: use dynamic debug instead of compile-time config option Hannes Reinecke
@ 2020-05-13 9:41 ` Damien Le Moal
2020-05-13 11:10 ` Hannes Reinecke
0 siblings, 1 reply; 7+ messages in thread
From: Damien Le Moal @ 2020-05-13 9:41 UTC (permalink / raw)
To: Hannes Reinecke, Mike Snitzer; +Cc: dm-devel@redhat.com
On 2020/05/13 16:10, Hannes Reinecke wrote:
> Switch to use dynamic debug to avoid having recompile the kernel
> just to enable debugging messages.
>
> Signed-off-by: Hannes Reinecke <hare@suse.de>
> ---
> include/linux/device-mapper.h | 7 +------
> 1 file changed, 1 insertion(+), 6 deletions(-)
>
> diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
> index e2d506dd805e..3d4365fd3001 100644
> --- a/include/linux/device-mapper.h
> +++ b/include/linux/device-mapper.h
> @@ -556,13 +556,8 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
> #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
> #define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
>
> -#ifdef CONFIG_DM_DEBUG
Can we remove this from Kconfig as a config option ?
> -#define DMDEBUG(fmt, ...) printk(KERN_DEBUG DM_FMT(fmt), ##__VA_ARGS__)
> +#define DMDEBUG(fmt, ...) pr_debug(DM_FMT(fmt), ##__VA_ARGS__)
> #define DMDEBUG_LIMIT(fmt, ...) pr_debug_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
> -#else
> -#define DMDEBUG(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
> -#define DMDEBUG_LIMIT(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
> -#endif
>
> #define DMEMIT(x...) sz += ((sz >= maxlen) ? \
> 0 : scnprintf(result + sz, maxlen - sz, x))
>
Otherwise, looks good to me.
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
--
Damien Le Moal
Western Digital Research
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] device-mapper: use dynamic debug instead of compile-time config option
2020-05-13 9:41 ` Damien Le Moal
@ 2020-05-13 11:10 ` Hannes Reinecke
2020-05-13 16:25 ` Mike Snitzer
0 siblings, 1 reply; 7+ messages in thread
From: Hannes Reinecke @ 2020-05-13 11:10 UTC (permalink / raw)
To: Damien Le Moal, Mike Snitzer; +Cc: dm-devel@redhat.com
On 5/13/20 11:41 AM, Damien Le Moal wrote:
> On 2020/05/13 16:10, Hannes Reinecke wrote:
>> Switch to use dynamic debug to avoid having recompile the kernel
>> just to enable debugging messages.
>>
>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>> ---
>> include/linux/device-mapper.h | 7 +------
>> 1 file changed, 1 insertion(+), 6 deletions(-)
>>
>> diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
>> index e2d506dd805e..3d4365fd3001 100644
>> --- a/include/linux/device-mapper.h
>> +++ b/include/linux/device-mapper.h
>> @@ -556,13 +556,8 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
>> #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
>> #define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
>>
>> -#ifdef CONFIG_DM_DEBUG
>
> Can we remove this from Kconfig as a config option ?
>
No, we can't, it's being used by dm-snap and dm-integrity.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: device-mapper: use dynamic debug instead of compile-time config option
2020-05-13 11:10 ` Hannes Reinecke
@ 2020-05-13 16:25 ` Mike Snitzer
2020-05-13 17:01 ` Hannes Reinecke
0 siblings, 1 reply; 7+ messages in thread
From: Mike Snitzer @ 2020-05-13 16:25 UTC (permalink / raw)
To: Hannes Reinecke; +Cc: Damien Le Moal, dm-devel@redhat.com
On Wed, May 13 2020 at 7:10am -0400,
Hannes Reinecke <hare@suse.de> wrote:
> On 5/13/20 11:41 AM, Damien Le Moal wrote:
> >On 2020/05/13 16:10, Hannes Reinecke wrote:
> >>Switch to use dynamic debug to avoid having recompile the kernel
> >>just to enable debugging messages.
> >>
> >>Signed-off-by: Hannes Reinecke <hare@suse.de>
> >>---
> >> include/linux/device-mapper.h | 7 +------
> >> 1 file changed, 1 insertion(+), 6 deletions(-)
> >>
> >>diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
> >>index e2d506dd805e..3d4365fd3001 100644
> >>--- a/include/linux/device-mapper.h
> >>+++ b/include/linux/device-mapper.h
> >>@@ -556,13 +556,8 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
> >> #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
> >> #define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
> >>-#ifdef CONFIG_DM_DEBUG
> >
> >Can we remove this from Kconfig as a config option ?
> >
> No, we can't, it's being used by dm-snap and dm-integrity.
Yeah, they provide additional debugging if its set.
But shouldn't we preserve old-style DMDEBUG if CONFIG_DM_DEBUG is set
(compile time printing of debugging) but if not set, use dynamic
debugging?
Think I'd prefer that as the incremental improvement... thoughts?
Mike
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: device-mapper: use dynamic debug instead of compile-time config option
2020-05-13 16:25 ` Mike Snitzer
@ 2020-05-13 17:01 ` Hannes Reinecke
2020-05-13 17:10 ` Mike Snitzer
0 siblings, 1 reply; 7+ messages in thread
From: Hannes Reinecke @ 2020-05-13 17:01 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien Le Moal, dm-devel@redhat.com
On 5/13/20 6:25 PM, Mike Snitzer wrote:
> On Wed, May 13 2020 at 7:10am -0400,
> Hannes Reinecke <hare@suse.de> wrote:
>
>> On 5/13/20 11:41 AM, Damien Le Moal wrote:
>>> On 2020/05/13 16:10, Hannes Reinecke wrote:
>>>> Switch to use dynamic debug to avoid having recompile the kernel
>>>> just to enable debugging messages.
>>>>
>>>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>>>> ---
>>>> include/linux/device-mapper.h | 7 +------
>>>> 1 file changed, 1 insertion(+), 6 deletions(-)
>>>>
>>>> diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
>>>> index e2d506dd805e..3d4365fd3001 100644
>>>> --- a/include/linux/device-mapper.h
>>>> +++ b/include/linux/device-mapper.h
>>>> @@ -556,13 +556,8 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
>>>> #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
>>>> #define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
>>>> -#ifdef CONFIG_DM_DEBUG
>>>
>>> Can we remove this from Kconfig as a config option ?
>>>
>> No, we can't, it's being used by dm-snap and dm-integrity.
>
> Yeah, they provide additional debugging if its set.
>
> But shouldn't we preserve old-style DMDEBUG if CONFIG_DM_DEBUG is set
> (compile time printing of debugging) but if not set, use dynamic
> debugging?
>
> Think I'd prefer that as the incremental improvement... thoughts?
>
Works for me; I just don't want to recompile the kernel anytime I need
to debug device-mapper stuff.
Will be resending.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: device-mapper: use dynamic debug instead of compile-time config option
2020-05-13 17:01 ` Hannes Reinecke
@ 2020-05-13 17:10 ` Mike Snitzer
2020-05-13 17:13 ` Hannes Reinecke
0 siblings, 1 reply; 7+ messages in thread
From: Mike Snitzer @ 2020-05-13 17:10 UTC (permalink / raw)
To: Hannes Reinecke; +Cc: Damien Le Moal, dm-devel@redhat.com
On Wed, May 13 2020 at 1:01pm -0400,
Hannes Reinecke <hare@suse.de> wrote:
> On 5/13/20 6:25 PM, Mike Snitzer wrote:
> >On Wed, May 13 2020 at 7:10am -0400,
> >Hannes Reinecke <hare@suse.de> wrote:
> >
> >>On 5/13/20 11:41 AM, Damien Le Moal wrote:
> >>>On 2020/05/13 16:10, Hannes Reinecke wrote:
> >>>>Switch to use dynamic debug to avoid having recompile the kernel
> >>>>just to enable debugging messages.
> >>>>
> >>>>Signed-off-by: Hannes Reinecke <hare@suse.de>
> >>>>---
> >>>> include/linux/device-mapper.h | 7 +------
> >>>> 1 file changed, 1 insertion(+), 6 deletions(-)
> >>>>
> >>>>diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
> >>>>index e2d506dd805e..3d4365fd3001 100644
> >>>>--- a/include/linux/device-mapper.h
> >>>>+++ b/include/linux/device-mapper.h
> >>>>@@ -556,13 +556,8 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
> >>>> #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
> >>>> #define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
> >>>>-#ifdef CONFIG_DM_DEBUG
> >>>
> >>>Can we remove this from Kconfig as a config option ?
> >>>
> >>No, we can't, it's being used by dm-snap and dm-integrity.
> >
> >Yeah, they provide additional debugging if its set.
> >
> >But shouldn't we preserve old-style DMDEBUG if CONFIG_DM_DEBUG is set
> >(compile time printing of debugging) but if not set, use dynamic
> >debugging?
> >
> >Think I'd prefer that as the incremental improvement... thoughts?
> >
> Works for me; I just don't want to recompile the kernel anytime I
> need to debug device-mapper stuff.
>
> Will be resending.
Does the use of pr_debug() cause missing newlines (with your patch)?
Only thought to ask this because I'm chasing another DM issue at the
moment and happened to see __dm_suspend()'s use of pr_debug() includes
an explicit extra \n.
Mike
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: device-mapper: use dynamic debug instead of compile-time config option
2020-05-13 17:10 ` Mike Snitzer
@ 2020-05-13 17:13 ` Hannes Reinecke
0 siblings, 0 replies; 7+ messages in thread
From: Hannes Reinecke @ 2020-05-13 17:13 UTC (permalink / raw)
To: Mike Snitzer; +Cc: Damien Le Moal, dm-devel@redhat.com
On 5/13/20 7:10 PM, Mike Snitzer wrote:
> On Wed, May 13 2020 at 1:01pm -0400,
> Hannes Reinecke <hare@suse.de> wrote:
>
>> On 5/13/20 6:25 PM, Mike Snitzer wrote:
>>> On Wed, May 13 2020 at 7:10am -0400,
>>> Hannes Reinecke <hare@suse.de> wrote:
>>>
>>>> On 5/13/20 11:41 AM, Damien Le Moal wrote:
>>>>> On 2020/05/13 16:10, Hannes Reinecke wrote:
>>>>>> Switch to use dynamic debug to avoid having recompile the kernel
>>>>>> just to enable debugging messages.
>>>>>>
>>>>>> Signed-off-by: Hannes Reinecke <hare@suse.de>
>>>>>> ---
>>>>>> include/linux/device-mapper.h | 7 +------
>>>>>> 1 file changed, 1 insertion(+), 6 deletions(-)
>>>>>>
>>>>>> diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
>>>>>> index e2d506dd805e..3d4365fd3001 100644
>>>>>> --- a/include/linux/device-mapper.h
>>>>>> +++ b/include/linux/device-mapper.h
>>>>>> @@ -556,13 +556,8 @@ void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
>>>>>> #define DMINFO(fmt, ...) pr_info(DM_FMT(fmt), ##__VA_ARGS__)
>>>>>> #define DMINFO_LIMIT(fmt, ...) pr_info_ratelimited(DM_FMT(fmt), ##__VA_ARGS__)
>>>>>> -#ifdef CONFIG_DM_DEBUG
>>>>>
>>>>> Can we remove this from Kconfig as a config option ?
>>>>>
>>>> No, we can't, it's being used by dm-snap and dm-integrity.
>>>
>>> Yeah, they provide additional debugging if its set.
>>>
>>> But shouldn't we preserve old-style DMDEBUG if CONFIG_DM_DEBUG is set
>>> (compile time printing of debugging) but if not set, use dynamic
>>> debugging?
>>>
>>> Think I'd prefer that as the incremental improvement... thoughts?
>>>
>> Works for me; I just don't want to recompile the kernel anytime I
>> need to debug device-mapper stuff.
>>
>> Will be resending.
>
> Does the use of pr_debug() cause missing newlines (with your patch)?
>
> Only thought to ask this because I'm chasing another DM issue at the
> moment and happened to see __dm_suspend()'s use of pr_debug() includes
> an explicit extra \n.
>
Hmm. Not that I've noticed; but yeah, typically one would have to add
'\n' to any of the pr_XXX calls. But then it depends on the wrapper
being used. I'll check.
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@suse.de +49 911 74053 688
SUSE Software Solutions GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), Geschäftsführer: Felix Imendörffer
--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2020-05-13 17:13 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-05-13 7:08 [PATCH] device-mapper: use dynamic debug instead of compile-time config option Hannes Reinecke
2020-05-13 9:41 ` Damien Le Moal
2020-05-13 11:10 ` Hannes Reinecke
2020-05-13 16:25 ` Mike Snitzer
2020-05-13 17:01 ` Hannes Reinecke
2020-05-13 17:10 ` Mike Snitzer
2020-05-13 17:13 ` Hannes Reinecke
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