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From: Chris Rigg <cdrigg@comcast.net>
To: Ingo Molnar <mingo@elte.hu>
Cc: Willy Tarreau <w@1wt.eu>, linux-kernel@vger.kernel.org
Subject: MAX_RT_PRIO - 1 Highest prio?
Date: Wed, 19 Sep 2007 17:20:27 -0600	[thread overview]
Message-ID: <46F1AEBB.6000809@comcast.net> (raw)
In-Reply-To: <20070918062606.GA5138@elte.hu>

Hello,

First, I'm assuming that if I want my task to have the HIGHEST priority 
in the system (i.e. preempt any other task whenever it is put into the 
ready queue (assuming I have preemption turned on/configured)), I use 
sched_setscheduler (...) and use the sched_priority in sched_param for 
MAX_RT_PRIO -1. Is this correct?

Second, assuming that MAX_RT_PRIO-1 is the highest, would it be bad on 
an SMP/Hyperthreading system (that's using the migration thread 
balancing in 2.6.20.7) to set a task's priority to MAX_RT_PRIO -1 given 
the fact that the migration threads are already set to MAX_RT_PRIO -1? 
Should I be setting my task's prio to MAX_RT_PRIO-2 to not interfere 
with the load balancing?

Thanks,
Chris


  reply	other threads:[~2007-09-19 23:20 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-17 20:33 CFS patch (v6) -- dynamic RT priorities? Chris Rigg
2007-09-18  5:00 ` Willy Tarreau
2007-09-18  6:26   ` Ingo Molnar
2007-09-19 23:20     ` Chris Rigg [this message]
2007-09-21  3:46       ` MAX_RT_PRIO - 1 Highest prio? Steven Rostedt

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