linux-kernel - Will CPU 0 be forever prohibited from NO_HZ

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Date:	Wed, 4 Dec 2013 11:39:57 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	fweisbec@...il.com
Cc:	linux-kernel@...r.kernel.org
Subject: Will CPU 0 be forever prohibited from NO_HZ_FULL status?

Hello, Frederic,

Just realized that I could further decrease RT latency of one of my "shut
up RCU on NO_HZ_FULL CPUs" patches if I relied on CPU 0 always having
a scheduling-clock tick unless the entire system is idle.  The trick
is that I could then rely on CPU 0 to detect RCU CPU stall warnings,
and remove the checking from the other CPUs.

Thoughts?

							Thanx, Paul

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