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Is there a way to list the kernel threads that are created by the kernel only?

What are the effects, if any, of scheduler priorities and policies for threads in an uncontended cpuset?Is there a good way to poll in a real-time process which is kernel friendly?Why kernel threads are treated as processesAre kernel threads processes and daemons?Participating on the the kernel mailing listlist all the files/directories created by a specific userHow to delete all the files which are not created todayHow does the kernel knows which “threads”/processes are associated with a process?Is there any way to modify or manage the startup processes in RHEL 7.4?understanding how threads are created inside linux operating system

1

The command ps aux | grep ] will list all the running kernel threads (the kernel threads that are crated by the kernel, and the kernel threads that are crated by someone else).

Is there a way to list the kernel threads that are created by the kernel only?

linux

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user343344user343344

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add a comment | 

1

The command ps aux | grep ] will list all the running kernel threads (the kernel threads that are crated by the kernel, and the kernel threads that are crated by someone else).

Is there a way to list the kernel threads that are created by the kernel only?

linux

share|improve this question

asked yesterday

user343344user343344

762

New contributor

user343344 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

The command ps aux | grep ] will list all the running kernel threads (the kernel threads that are crated by the kernel, and the kernel threads that are crated by someone else).

Is there a way to list the kernel threads that are created by the kernel only?

linux

share|improve this question

asked yesterday

user343344user343344

762

New contributor

user343344 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked yesterday

user343344user343344

762

New contributor

user343344 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked yesterday

user343344user343344

762

New contributor

user343344 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked yesterday

user343344user343344

762

New contributor

user343344 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked yesterday

user343344user343344

762

1 Answer
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2

Kernel threads are always created by the kernel, and they’re always in process group 0, so you can filter on that:

ps -e -o pid,ppid,pgid,args | awk '$3 == 0'

(There doesn’t seem to be a way of filtering on process group id in ps; in theory one could filter on session 0 but ps doesn’t like that.)

You can also look for processes whose parent is kthreadd, the kernel thread dæmon:

ps --pid 2 --ppid 2 -o pid,ppid,pgid,args

(including pid 2 and its children).

share|improve this answer

answered yesterday

Stephen KittStephen Kitt

178k24404481

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "Kernel threads are always created by the kernel" By "Kernel" do you mean the kernel and the kernel modules or just the kernel by itself (because I think kthread_create() is used by kernel modules to create kernel threads)?
  
  – user343344
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, both the kernel and kernel modules; I tend not to distinguish them since most modules can be built in, and once loaded, modules are effectively part of the kernel.
  
  – Stephen Kitt
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You could perhaps distinguish between threads started by the “core” kernel from those started by modules by looking at etimes in ps.
  
  – Stephen Kitt
  yesterday
  

  
  
  
  

add a comment | 

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2

Kernel threads are always created by the kernel, and they’re always in process group 0, so you can filter on that:

ps -e -o pid,ppid,pgid,args | awk '$3 == 0'

(There doesn’t seem to be a way of filtering on process group id in ps; in theory one could filter on session 0 but ps doesn’t like that.)

You can also look for processes whose parent is kthreadd, the kernel thread dæmon:

ps --pid 2 --ppid 2 -o pid,ppid,pgid,args

(including pid 2 and its children).

share|improve this answer

answered yesterday

Stephen KittStephen Kitt

178k24404481

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "Kernel threads are always created by the kernel" By "Kernel" do you mean the kernel and the kernel modules or just the kernel by itself (because I think kthread_create() is used by kernel modules to create kernel threads)?
  
  – user343344
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, both the kernel and kernel modules; I tend not to distinguish them since most modules can be built in, and once loaded, modules are effectively part of the kernel.
  
  – Stephen Kitt
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You could perhaps distinguish between threads started by the “core” kernel from those started by modules by looking at etimes in ps.
  
  – Stephen Kitt
  yesterday
  

  
  
  
  

add a comment | 

2

Kernel threads are always created by the kernel, and they’re always in process group 0, so you can filter on that:

ps -e -o pid,ppid,pgid,args | awk '$3 == 0'

(There doesn’t seem to be a way of filtering on process group id in ps; in theory one could filter on session 0 but ps doesn’t like that.)

You can also look for processes whose parent is kthreadd, the kernel thread dæmon:

ps --pid 2 --ppid 2 -o pid,ppid,pgid,args

(including pid 2 and its children).

share|improve this answer

answered yesterday

Stephen KittStephen Kitt

178k24404481

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  "Kernel threads are always created by the kernel" By "Kernel" do you mean the kernel and the kernel modules or just the kernel by itself (because I think kthread_create() is used by kernel modules to create kernel threads)?
  
  – user343344
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Yes, both the kernel and kernel modules; I tend not to distinguish them since most modules can be built in, and once loaded, modules are effectively part of the kernel.
  
  – Stephen Kitt
  yesterday
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  You could perhaps distinguish between threads started by the “core” kernel from those started by modules by looking at etimes in ps.
  
  – Stephen Kitt
  yesterday
  

  
  
  
  

add a comment | 

Kernel threads are always created by the kernel, and they’re always in process group 0, so you can filter on that:

ps -e -o pid,ppid,pgid,args | awk '$3 == 0'

(There doesn’t seem to be a way of filtering on process group id in ps; in theory one could filter on session 0 but ps doesn’t like that.)

You can also look for processes whose parent is kthreadd, the kernel thread dæmon:

ps --pid 2 --ppid 2 -o pid,ppid,pgid,args

(including pid 2 and its children).

share|improve this answer

answered yesterday

Stephen KittStephen Kitt

178k24404481

ps -e -o pid,ppid,pgid,args | awk '$3 == 0'

ps --pid 2 --ppid 2 -o pid,ppid,pgid,args

share|improve this answer

answered yesterday

Stephen KittStephen Kitt

178k24404481

answered yesterday

Stephen KittStephen Kitt

178k24404481

answered yesterday

Stephen KittStephen Kitt

178k24404481