linux-kernel - [PATCH 0/3] cputime: Moar cleanups / enhancements

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Date:	Tue,  9 Oct 2012 00:36:05 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Luck <tony.luck@...el.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Joerg Roedel <joerg.roedel@....com>,
	Alexander Graf <agraf@...e.de>,
	Xiantao Zhang <xiantao.zhang@...el.com>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>
Subject: [PATCH 0/3] cputime: Moar cleanups / enhancements

Hi,

I think that the 1st and 3rd patches are pretty uncontroversial given
how vtime_account() confusingly tries to do everything for
CONFIG_VIRT_CPU_ACCOUNTING and CONFIG_IRQ_TIME_ACCOUNTING.

I believe the 2nd is also desired. vtime_account() is called
two times per irq, sometimes more if softirqs are involved. So
I think we want to optimize that by calling directly its specialized
APIs when possible.

There is still some work to do but I'm proceeding step by step.
I may focuse more on that generic vtime implementation next
time to implement cputime accounting for the tickmess patchset.
That, for sure, will inspire for even more cputime optimizations/cleanups.

Thanks.

PS: tested on x86 and ppc64 (checked reliability of times and /proc/stat).
But only built tested on s390 and ia64.

Frederic Weisbecker (3):
  kvm: Directly account vtime to system on guest switch
  cputime: Specialize irq vtime hooks
  cputime: Separate irqtime accounting from generic vtime

 arch/ia64/kernel/time.c     |    1 +
 arch/powerpc/kernel/time.c  |    1 +
 arch/s390/kernel/vtime.c    |    4 ++
 include/linux/hardirq.h     |   80 +++++++++++++++++++++++++++++++++++--------
 include/linux/kernel_stat.h |    8 ----
 include/linux/kvm_host.h    |   12 +++++-
 kernel/sched/cputime.c      |    8 ++--
 kernel/softirq.c            |    6 ++--
 8 files changed, 88 insertions(+), 32 deletions(-)

-- 
1.7.5.4

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