From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: rostedt@goodmis.org, peterz@infradead.org
Cc: linux-rt-users@vger.kernel.org
Subject: Load-balancing at migrate-enable time?
Date: Wed, 26 Oct 2011 11:30:36 -0700 [thread overview]
Message-ID: <20111026183036.GA3608@linux.vnet.ibm.com> (raw)
Hello!
So I am getting the second round of the model beaten into shape, but
have a question...
Assume the following state:
1. Task 0 preempted in a migrate-disable region on CPU 0.
2. Task 1 preempted, but not in a migrate-disable region,
also on CPU 0.
3. Task 2 running in a migrate-disable region also on CPU 0
Suppose that Task 2 enables migration. Will it actually migrate
in order to allow Task 1 to run? (My guess is "no", but...)
Thanx, Paul
------------------------------------------------------------------------
PS. We get to the above state by starting as follows:
1. Task 0 blocked in a migrate-disable region on CPU 0.
2. Task 1 running on CPU 0 without migration disabled.
3. Task 2 blocked in a migrate-disable region also on CPU 0
Then Task 2 awakens, preempting Task 1. (In the more-aggressive
model, this would trigger migration of Task 1, but I am trying to
match what the load balancer actually does.)
reply other threads:[~2011-10-27 7:46 UTC|newest]
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