Re: cvs commit: src/sys/sys usched.h src/sys/kern usched_bsd4.c kern_clock.c src/bin/ps extern.h keyword.c print.c

[Hiten Pandya <hmp@xxxxxxxxxxxxx>]

Matthew Dillon wrote:
> :
> :David Rhodus wrote:
> :> That has already been the case for over a year now that each cpu has had 
> :> it own scheduler.
> :> 
> :
> :	The above statement is only true for the in-kernel LWKT scheduler.
> :
> :	As for the userland scheduler, it's a totally different beast.
> :
> :					-Hiten
> :					Hiten Pandya
>
>     Right.  the LWKT scheduler (which does the actual real life scheduling
>     of the thread) is a per-cpu scheduler.  The userland scheduler, whos
>     job it is to select which of the runnable userland processes should be
>     passed on to LWKT, currently requires the Big Giant Lock.
>
>     Note that all kernel threads are pure LWKT threads.  So while I want
>     to fix the userland scheduler issue I don't think it would actually
>     make much difference in performance.
>
> 					-Matt
> 					Matthew Dillon 
> 					<dillon@xxxxxxxxxxxxx>

	But I suppose once the whole path becomes BGL-free, it will certainly
	make a difference.

			-Hiten