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From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Sun, 02 Dec 2007 11:58:04 GMT."
	<18378.1196596684@critter.freebsd.dk> 
Date: Sun, 02 Dec 2007 12:02:49 +0000
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Cc: Attilio Rao <attilio@freebsd.org>, arch@freebsd.org,
	Robert Watson <rwatson@freebsd.org>, Andre Oppermann <andre@freebsd.org>
Subject: Re: New "timeout" api, to replace callout 
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In message <18378.1196596684@critter.freebsd.dk>, "Poul-Henning Kamp" writes:

>>  o TCP has hot and cold CPU/cache affinity.
>>
>>     -> The timer facility should provide strong, weak and "don't care"
>>        CPU affinity.  The affinity should be selected for a timer as
>>        whole, not upon each call.
>
>That is the "timeout_p" you pass into timeout_init() is for.
>
>What values we will provide there is not decided, apart from NULL
>meaning "whatever..."

I guess I need to elaborate that point some more:

If we want CPU affinity, what happens that that we pass a per-cpu
timeout provider:

	timeout_init(&pcpu->timouts, ...)

If we want a private timeout group for NFS we pass that in:

	timeout_init(&nfs_timeouts, ...)

Think of the implmentation of the timeouts as an object of which we
can have multiple instances with various private properties...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.