usb kthreads

[Julian Elischer]

Andrew Thompson wrote:
> Hi,
> 
> 
> Here is an aesthetic patch to change the usb kernel processes to threads,
> this hides them from the usual 'ps' output. Please test and review.
> 
>  1290  ??  DL     0:00.00 [usbus0]
>  [lots and lots more...]
>  1309  ??  DL     0:00.00 [usbus4]
> 
> After the patch they can be seen as kernel threads.
> 
>   PID    TID COMM             TDNAME           CPU  PRI STATE   WCHAN    
>     0 100000 kernel           swapper            0   68 sleep   sched     
>     0 100009 kernel           firmware taskq     0   92 sleep   -         
>     0 100020 kernel           kqueue taskq       0   92 sleep   -         
>     0 100021 kernel           acpi_task_0        0   92 sleep   -         
>     0 100022 kernel           acpi_task_1        0   92 sleep   -         
>     0 100023 kernel           acpi_task_2        0   92 sleep   -         
>     0 100027 kernel           thread taskq       0   92 sleep   -         
>     0 100031 kernel           bwi0 taskq         0   16 sleep   -         
>     0 100032 kernel           bwi0 taskq         0   16 sleep   -         
>     0 100106 kernel           usbus0             0   20 sleep   wmsg      
>     0 100107 kernel           usbus0             0   16 sleep   wmsg      
>     0 100108 kernel           usbus0             0   20 sleep   wmsg      
>     0 100109 kernel           usbus0             0   20 sleep   wmsg      
>     [ ... ]
>     0 100127 kernel           usbus4             0   20 sleep   wmsg      
> 
> 
> Andrew

use kproc_kthread_add()
to create a seoarate usb process and make all the threads belong to 
that process.
(kproc_kthread_add() will create a new process the first time
and add more threads to it the more it is run.)


> 
> 
> 
> Index: dev/usb/usb_process.c
> ===================================================================
> --- dev/usb/usb_process.c	(revision 196086)
> +++ dev/usb/usb_process.c	(working copy)
> @@ -64,9 +64,9 @@
>  
>  #if (__FreeBSD_version >= 800000)
>  #define	USB_THREAD_CREATE(f, s, p, ...) \
> -		kproc_create((f), (s), (p), RFHIGHPID, 0, __VA_ARGS__)
> -#define	USB_THREAD_SUSPEND(p)   kproc_suspend(p,0)
> -#define	USB_THREAD_EXIT(err)	kproc_exit(err)
> +		kthread_add((f), (s), NULL, (p), 0, 0, __VA_ARGS__)
> +#define	USB_THREAD_SUSPEND(p)   kthread_suspend(p,0)
> +#define	USB_THREAD_EXIT(err)	kthread_exit()
>  #else
>  #define	USB_THREAD_CREATE(f, s, p, ...) \
>  		kthread_create((f), (s), (p), RFHIGHPID, 0, __VA_ARGS__)
> Index: dev/usb/usb_process.h
> ===================================================================
> --- dev/usb/usb_process.h	(revision 196086)
> +++ dev/usb/usb_process.h	(working copy)
> @@ -49,7 +49,7 @@ struct usb_process {
>  	struct cv up_cv;
>  	struct cv up_drain;
>  
> -	struct proc *up_ptr;
> +	struct thread *up_ptr;
>  	struct thread *up_curtd;
>  	struct mtx *up_mtx;
>  
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