linux-kernel - [PATCH 0/5] cputime: Moar cleanups / enhancements v2

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Date:	Thu, 25 Oct 2012 02:51:48 +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>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	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 0/5] cputime: Moar cleanups / enhancements v2

I made some changes to the series:

- Handle possible softirq interrupting idle on local_bh_enable()
- Have a dedicated vtime.h header file
- Do some clearer ifdeffery
- Use an irqsafe vtime_account_system() on kvm.

Patches 1/5 and 5/5 are something I really think we want. Patch 3/5
implicitly fixes a bug in s390. If you prefer I can just fix s390
and drop the rest of the patch that is just a micro-optimization
in the kvm guest switch path.

The rest of the patches is micro optimizations on the irq path.
If you think these are pointless over-optimizations, I can just drop
these and only keep 1/5, rebase 5/5 and extract the bug fix in s390 that
resides in 3/5.

Otherwise I'll send a pull request to Ingo in a week or so.

If you want to test, it is pullable from:

git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
	cputime/cleanups-v3

Tested on powerpc and x86. Built tested on ia64. s390 doesn't build defconfig
on v3.7-rc2.

Frederic Weisbecker (5):
  vtime: Gather vtime declarations to their own header file
  vtime: Provide an irq safe version of vtime_account_system()
  kvm: Directly account vtime to system on guest switch
  cputime: Specialize irq vtime hooks
  cputime: Separate irqtime accounting from generic vtime

 arch/s390/kernel/vtime.c    |    4 +++
 include/linux/hardirq.h     |   15 ++----------
 include/linux/kernel_stat.h |    9 +-------
 include/linux/kvm_host.h    |   12 +++++++++-
 include/linux/vtime.h       |   48 +++++++++++++++++++++++++++++++++++++++++++
 kernel/sched/cputime.c      |   13 +++++++++-
 kernel/softirq.c            |    6 ++--
 7 files changed, 80 insertions(+), 27 deletions(-)
 create mode 100644 include/linux/vtime.h

-- 
1.7.5.4

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