linux-kernel - [PATCH v3 0/2] nohz: fix idle accounting in NO

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Message-ID: <53465F54.708@jp.fujitsu.com>
Date:	Thu, 10 Apr 2014 18:07:32 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	linux-kernel@...r.kernel.org
CC:	Fernando Luis Vazquez Cao <fernando_b1@....ntt.co.jp>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Denys Vlasenko <vda.linux@...glemail.com>,
	stable@...r.kernel.org
Subject: [PATCH v3 0/2] nohz: fix idle accounting in NO_HZ kernels

Hi all,

This patch set (rebased on v3.14) is my 3rd try to fix an issue
that idle/iowait of /proc/stat can go backward. Originally reported
by Tetsuo and Fernando at last year, Mar 2013.

This v3 takes new approach to fix the problem, and now use seqcount
while v1 and v2 uses seqlock.

Of course still reviews are welcome!

Thanks,
H.Seto

Hidetoshi Seto (2):
      nohz: stop updating sleep stats from get_cpu_{idle,iowait}_time_us()
      nohz: use delayed iowait accounting to avoid race on idle time stats

 include/linux/tick.h     |    6 ++-
 kernel/time/tick-sched.c |  116 ++++++++++++++++++++++++++++------------------
 2 files changed, 74 insertions(+), 48 deletions(-)

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