linux-kernel - cgroup, RT cpu balance question

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Message-ID: <b6a2d2e20903160356y67db8472k43577d706a393d96@mail.gmail.com>
Date:	Mon, 16 Mar 2009 10:56:04 +0000
From:	Rolando Martins <rolando.martins@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: cgroup, RT cpu balance question

Hi,
I have one question regarding RT cpu balance using cgroup.

cgroup
echo 1 > cpuset.sched_load_balance

cgroup/2
echo 0 > cpuset.mems
echo 0-2 > cpuset.cpus
echo 450000 > cpu.rt_runtime_us

cgroup/3
echo 0 > cpuset.mems
echo 3 > cpuset.cpus
echo 450000 > cpu.rt_runtime_us

I have a small test that uses a loop to utilize 100% cpu (SCHED_FIFO).
When I run 2 tests on cgroup/3, it only uses bandwidth from cpu 3
(100%), the balancing isn't happening.
As I use the SCHED_FIFO, the 2 processes run sequentially.

Is this the expected behavior? Shouldn't the domains balance the spare
cpu bandwidth?

Thanks,
Rolando
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