From: Victor Yodaiken <yodaiken@fsmlabs.com>
To: Mike Kravetz <kravetz@us.ibm.com>
Cc: Davide Libenzi <davidel@xmailserver.org>,
lse-tech@lists.sourceforge.net,
lkml <linux-kernel@vger.kernel.org>
Subject: Re: Real Time Runqueue
Date: Mon, 19 Nov 2001 08:15:43 -0700 [thread overview]
Message-ID: <20011119081543.A27011@hq2> (raw)
In-Reply-To: <20011116154701.G1152@w-mikek2.des.beaverton.ibm.com> <Pine.LNX.4.40.0111161620050.998-100000@blue1.dev.mcafeelabs.com> <20011116163224.H1152@w-mikek2.des.beaverton.ibm.com>
In-Reply-To: <20011116163224.H1152@w-mikek2.des.beaverton.ibm.com>
On Fri, Nov 16, 2001 at 04:32:24PM -0800, Mike Kravetz wrote:
> The reason I ask is that we went through the pains of a separate
> realtime RQ in our MQ scheduler. And yes, it does hurt the common
> case, not to mention the extra/complex code paths. I was hoping
> that someone in the know could enlighten us as to how RT semantics
> apply to SMP systems. If the semantics I suggest above are required,
> then it implies support must be added to any possible future
> scheduler implementations.
POSIX RT specs, at least last year, did not mention any SMP
requirements for scheduling at all.
What we do in RTLinux is require that RT threads be associated with a
processor identifier on the theory that the user may have some idea what
processors should run which RT threads, but the OS has no way of
guessing.
>
> --
> Mike
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
next prev parent reply other threads:[~2001-11-19 15:22 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-11-16 20:20 Real Time Runqueue Mike Kravetz
2001-11-16 20:26 ` Richard Gooch
2001-11-16 22:44 ` Davide Libenzi
2001-11-16 23:47 ` Mike Kravetz
2001-11-17 0:28 ` Davide Libenzi
2001-11-17 0:32 ` Mike Kravetz
2001-11-17 8:08 ` [Lse-tech] " george anzinger
2001-11-19 20:23 ` Matthew Dobson
2001-11-19 15:15 ` Victor Yodaiken [this message]
2001-11-19 16:30 ` Andi Kleen
2001-11-19 17:06 ` Davide Libenzi
2001-11-19 18:23 ` Richard Gooch
2001-11-19 19:07 ` Mike Kravetz
2001-11-19 18:32 ` george anzinger
2001-11-19 18:40 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2001-11-16 22:41 Jesse Pollard
2001-11-17 0:13 ` Davide Libenzi
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