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tick based timekeeping from a housekeeping CPU

From:  riel@redhat.com
To:  linux-kernel@vger.kernel.org
Subject:  [RFC INCOMPLETE] tick based timekeeping from a housekeeping CPU
Date:  Wed, 24 Jun 2015 10:57:49 -0400
Message-ID:  <1435157880-22925-1-git-send-email-riel@redhat.com>
Cc:  fweisbec@redhat.com, peterz@infradead.org, mingo@kernel.org, tglx@linutronix.de, luto@amacapital.net
Archive‑link:  Article

This series seems to make basic tick based time sampling from a
housekeeping CPU work, allowing us to have tick based accounting
on a nohz_full CPU, and no longer doing vtime accounting on those
CPUs.

It still needs a major  cleanup, and steal time accounting and irq
accounting are still missing.

Just posting this to get a sense of whether I am headed in the right
direction, or whether we need some major overhaul/cleanup of part of
the code first.

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