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From: John Baldwin <jhb@freebsd.org>
To: Jeff Roberson <jeff@freebsd.org>
Date: Fri, 4 Apr 2008 09:04:37 -0400
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Subject: Re: cvs commit: src/sys/kern sched_ule.c
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On Thursday 03 April 2008 09:04:43 pm Jeff Roberson wrote:
> jeff        2008-04-04 01:04:43 UTC
>
>   FreeBSD src repository
>
>   Modified files:
>     sys/kern             sched_ule.c
>   Log:
>    - Don't check for the ITHD pri class in tdq_load_add and rem.  4BSD
> doesn't do this either.  Simply check P_NOLOAD.  It'd be nice if this was
> in a thread flag so we didn't have an extra cache miss every time we add
> and remove a thread from the run-queue.

Actually, now that all interrupt threads are in a single process, it should be 
a per-thread flag.  It was only ever intended to mask softclock since that is 
what did the load calculation on 4BSD so that 4BSD wouldn't always return a 
load of 1 even on an idle box (since softclock was always running when the 
load was checked).

-- 
John Baldwin