From: Wang Yaxin <wang.yaxin@zte.com.cn>

The delaytop tool supports showing system delays and task-level delays,
effectively identifying the top-n tasks with high latency in the system,
which is highly beneficial for improving system performance. Wang Yaxin
and her colleague Fan Yu focus on locating system delay issues. To promote
the thriving development of delaytop, we hope to serve as maintainers to
continuously improve it, aiming to provide a more effective solution for
system latency issues in the future.

Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn>
Signed-off-by: Fan Yu <fan.yu9@zte.com.cn>
---
 MAINTAINERS | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index d635369a4f6c..e6fec6b0055d 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19524,6 +19524,16 @@ S:	Maintained
 F:	include/linux/delayacct.h
 F:	kernel/delayacct.c

+TASK DELAY MONITORING TOOLS
+M:	Andrew Morton <akpm@linux-foundation.org>
+M:	Wang Yaxin <wang.yaxin@zte.com.cn>
+M:	Fan Yu <fan.yu9@zte.com.cn>
+L:	linux-kernel@vger.kernel.org
+S:	Maintained
+F:	Documentation/accounting/delay-accounting.rst
+F:	tools/accounting/delaytop.c
+F:	tools/accounting/getdelays.c
+
 PERFORMANCE EVENTS SUBSYSTEM
 M:	Peter Zijlstra <peterz@infradead.org>
 M:	Ingo Molnar <mingo@redhat.com>
-- 
2.25.1

On 21/07/2025 03:40, jiang.kun2@zte.com.cn wrote:
> From: Wang Yaxin <wang.yaxin@zte.com.cn>
> 
> The delaytop tool supports showing system delays and task-level delays,
> effectively identifying the top-n tasks with high latency in the system,
> which is highly beneficial for improving system performance. Wang Yaxin
> and her colleague Fan Yu focus on locating system delay issues. To promote
> the thriving development of delaytop, we hope to serve as maintainers to
> continuously improve it, aiming to provide a more effective solution for
> system latency issues in the future.
> 
> Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn>
> Signed-off-by: Fan Yu <fan.yu9@zte.com.cn>
> ---
>  MAINTAINERS | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index d635369a4f6c..e6fec6b0055d 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -19524,6 +19524,16 @@ S:	Maintained
>  F:	include/linux/delayacct.h
>  F:	kernel/delayacct.c
> 
> +TASK DELAY MONITORING TOOLS
> +M:	Andrew Morton <akpm@linux-foundation.org>
> +M:	Wang Yaxin <wang.yaxin@zte.com.cn>


There were no contributions from above address. Not a single
contribution. Not a single review, not a single message or comment. If
the person wants to review, why reviewing did not happen so far?

> +M:	Fan Yu <fan.yu9@zte.com.cn>

And from here just one patchset not even related to delaytop.

So combining above it is really surprising that you want to maintain
this part.


Best regards,
Krzysztof

>> @@ -19524,6 +19524,16 @@ S:    Maintained
>>  F:    include/linux/delayacct.h
>>  F:    kernel/delayacct.c
>> 
>> +TASK DELAY MONITORING TOOLS
>> +M:    Andrew Morton <akpm@linux-foundation.org>
>> +M:    Wang Yaxin <wang.yaxin@zte.com.cn>
>
>
>There were no contributions from above address. Not a single
>contribution. Not a single review, not a single message or comment. If
>the person wants to review, why reviewing did not happen so far?

Hi Krzysztof,
Thank you for your feedback. I completely understand your concerns about
the maintainer role, and I’d like to provide some context to clarify the
situation.

1) delaytop contributions
Delaytop is used to observe system-wide latency top-n tasks, which helps
in locating latency-related system performance issues. 
As Andrew mentioned, delaytop is indeed a new module currently only in
mm.git, which is why there are no related patches in mainline yet.
The related patches are as follows:  
https://lore.kernel.org/all/20250619211843633h05gWrBDMFkEH6xAVm_5y@zte.com.cn/
https://lore.kernel.org/all/20250710135451340_5pOgpIFi0M5AE7H44W1D@zte.com.cn/

2) latency-related contributions
I’ve also contributed to latency monitoring in the past (e.g., max latency patches),
showing a continued interest in this area.
https://lore.kernel.org/all/20241203164848805CS62CQPQWG9GLdQj2_BxS@zte.com.cn/
https://lore.kernel.org/all/20241220173105906EOdsPhzjMLYNJJBqgz1ga@zte.com.cn/

3) maintainer role intent
Since the module is new, we recognize that broader community review and adoption
will take time, and we’re committed to supporting that process.

>> +M:    Fan Yu <fan.yu9@zte.com.cn>
>
>And from here just one patchset not even related to delaytop.
>
>So combining above it is really surprising that you want to maintain
>this part.

The development of delaytop (including the initial patches) was a collaborative effort,
as reflected in the Co-developed-by tags. Applying to be the maintainer is to ensure
the long-term evolution of delaytop, while also making it easier for other developers to CC us.  

I’d be happy to address any further questions or suggestions. Thank you for your time and consideration! 

Yaxin
Thanks

> which is highly beneficial for improving system performance. Wang Yaxin
> and her colleague Fan Yu focus on locating system delay issues. To promote
> the thriving development of delaytop, we hope to serve as maintainers to
> continuously improve it, aiming to provide a more effective solution for
> system latency issues in the future.
I'm pleased to see young colleagues contributing multiple patches in the field of
delay observation and aspiring to become maintainers of new tools. With more
and more latency-sensitive devices running Linux, such as communication
equipment and intelligent vehicles, I believe delay observation is a promising
area, and thus delaytop has good potential for application. On the other hand,
the tool is still somewhat simple, and I have already replied with some suggestions
—I would feel happy if you adopt them. I thingk becoming a maintainer means
passion and responsibility, hope you will keep moving forward. Best of luck!

Reviewed-by: Yang Yang <yang.yang29@zte.com.cn>

On Mon, 21 Jul 2025 08:56:18 +0200 Krzysztof Kozlowski <krzk@kernel.org> wrote:

> On 21/07/2025 03:40, jiang.kun2@zte.com.cn wrote:
> > From: Wang Yaxin <wang.yaxin@zte.com.cn>
> > 
> > The delaytop tool supports showing system delays and task-level delays,
> > effectively identifying the top-n tasks with high latency in the system,
> > which is highly beneficial for improving system performance. Wang Yaxin
> > and her colleague Fan Yu focus on locating system delay issues. To promote
> > the thriving development of delaytop, we hope to serve as maintainers to
> > continuously improve it, aiming to provide a more effective solution for
> > system latency issues in the future.
> > 
> > Signed-off-by: Wang Yaxin <wang.yaxin@zte.com.cn>
> > Signed-off-by: Fan Yu <fan.yu9@zte.com.cn>
> > ---
> >  MAINTAINERS | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> > 
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index d635369a4f6c..e6fec6b0055d 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -19524,6 +19524,16 @@ S:	Maintained
> >  F:	include/linux/delayacct.h
> >  F:	kernel/delayacct.c
> > 
> > +TASK DELAY MONITORING TOOLS
> > +M:	Andrew Morton <akpm@linux-foundation.org>
> > +M:	Wang Yaxin <wang.yaxin@zte.com.cn>
> 
> 
> There were no contributions from above address. Not a single
> contribution. Not a single review, not a single message or comment. If
> the person wants to review, why reviewing did not happen so far?

That because tools/accounting/delaytop.c was created by Wang Yaxin one
month ago.  It exists only in mm.git!

> > +M:	Fan Yu <fan.yu9@zte.com.cn>
> 
> And from here just one patchset not even related to delaytop.

If the creator of delaytop wishes to nominate someone else as a
comaintainer then I'm OK with that.

Sure, they haven't been very involved in getdelays but these
individuals presumably understand getdelays and nobody else has stepped
up, so I think the patch improves our situation.