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Date: Wed, 23 Jan 2013 01:34:54 +0100
From: Frederic Weisbecker <fweisbec@...il.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <fweisbec@...il.com>,
Alessio Igor Bogani <abogani@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Chris Metcalf <cmetcalf@...era.com>,
Christoph Lameter <cl@...ux.com>,
Geoff Levand <geoff@...radead.org>,
Gilad Ben Yossef <gilad@...yossef.com>,
Hakan Akkan <hakanakkan@...il.com>,
Ingo Molnar <mingo@...nel.org>,
Li Zhong <zhong@...ux.vnet.ibm.com>,
Namhyung Kim <namhyung.kim@....com>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Paul Gortmaker <paul.gortmaker@...driver.com>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Thomas Gleixner <tglx@...utronix.de>
Subject: [ANNOUNCE] 3.8-rc4-nohz3
Hi,
This version of the full dynticks patchset integrates the latest full
dynticks cputime accounting changes (see https://lkml.org/lkml/2013/1/22/652)
and is rebased against 3.8-rc4.
All of these patches have been posted already so I'm not spamming
you again.
You can pull from:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
3.8-rc4-nohz3
So this fixes and improve a lot of things since 3.8-rc2-nohz2:
- Use sched_clock() instead of jiffies for better precision. And because
jiffies granularity was requiring too much dirty hacks to make it working.
(Thanks Steven for the suggestion).
- To fully support sched_clock(), use a per nanosec granularity in cputime_t
- Fix a deadlock with tsacct
- Better description of the Kconfig
- Don't scale generic vtime accounting against CFS precise task time accounting.
Now that we use sched_clock() we should have precise enough statistics.
- Consolidate some code in the reader side
- Make the reader irqsafe (fix potential deadlock against writers)
- Handle guest cputime
- Handle idle tasks. Those were special because they don't start from schedule()
so they need their own initializations.
- Fix build error with CONFIG_IRQ_TIME_ACCOUNTING (thanks Wu Fenguang)
- Depend on 64 bits archs to make kernel_cpustat reading to be atomic
Thanks.
---
Frederic Weisbecker (44):
irq_work: Fix racy IRQ_WORK_BUSY flag setting
irq_work: Fix racy check on work pending flag
irq_work: Remove CONFIG_HAVE_IRQ_WORK
nohz: Add API to check tick state
irq_work: Don't stop the tick with pending works
irq_work: Make self-IPIs optable
printk: Wake up klogd using irq_work
context_tracking: Add comments on interface and internals
context_tracking: Export context state for generic vtime
cputime: Librarize per nsecs resolution cputime definitions
cputime: Move default nsecs_to_cputime() to jiffies based cputime file
cputime: Generic on-demand virtual cputime accounting
cputime: Allow dynamic switch between tick/virtual based cputime accounting
cputime: Use accessors to read task cputime stats
kvm: Prepare to add generic guest entry/exit callbacks
cputime: Safely read cputime of full dynticks CPUs
Merge branch 'nohz/printk-v8'
nohz: Basic full dynticks interface
nohz: Assign timekeeping duty to a non-full-nohz CPU
nohz: Trace timekeeping update
nohz: Wake up full dynticks CPUs when a timer gets enqueued
rcu: Restart the tick on non-responding full dynticks CPUs
sched: Comment on rq->clock correctness in ttwu_do_wakeup() in nohz
sched: Update rq clock on nohz CPU before migrating tasks
sched: Update rq clock on nohz CPU before setting fair group shares
sched: Update rq clock on tickless CPUs before calling check_preempt_curr()
sched: Update rq clock earlier in unthrottle_cfs_rq
sched: Update clock of nohz busiest rq before balancing
sched: Update rq clock before idle balancing
sched: Update nohz rq clock before searching busiest group on load balancing
nohz: Move nohz load balancer selection into idle logic
nohz: Full dynticks mode
nohz: Only stop the tick on RCU nocb CPUs
nohz: Don't turn off the tick if rcu needs it
nohz: Don't stop the tick if posix cpu timers are running
nohz: Add some tracing
rcu: Don't keep the tick for RCU while in userspace
profiling: Remove unused timer hook
timer: Don't run non-pinned timer to full dynticks CPUs
sched: Use an accessor to read rq clock
sched: Debug nohz rq clock
sched: Remove broken check for skip clock update
sched: Update rq clock before rt sched average scale
sched: Disable lb_bias feature for full dynticks
Steven Rostedt (2):
irq_work: Flush work on CPU_DYING
irq_work: Warn if there's still work on cpu_down
arch/alpha/Kconfig | 1 -
arch/alpha/kernel/osf_sys.c | 6 +-
arch/arm/Kconfig | 1 -
arch/arm64/Kconfig | 1 -
arch/blackfin/Kconfig | 1 -
arch/frv/Kconfig | 1 -
arch/hexagon/Kconfig | 1 -
arch/ia64/include/asm/cputime.h | 92 +--------
arch/ia64/include/asm/thread_info.h | 4 +-
arch/ia64/include/asm/xen/minstate.h | 2 +-
arch/ia64/kernel/asm-offsets.c | 2 +-
arch/ia64/kernel/entry.S | 16 +-
arch/ia64/kernel/fsys.S | 4 +-
arch/ia64/kernel/head.S | 4 +-
arch/ia64/kernel/ivt.S | 8 +-
arch/ia64/kernel/minstate.h | 2 +-
arch/ia64/kernel/time.c | 4 +-
arch/mips/Kconfig | 1 -
arch/parisc/Kconfig | 1 -
arch/powerpc/Kconfig | 1 -
arch/powerpc/configs/chroma_defconfig | 2 +-
arch/powerpc/configs/corenet64_smp_defconfig | 2 +-
arch/powerpc/configs/pasemi_defconfig | 2 +-
arch/powerpc/include/asm/cputime.h | 6 +-
arch/powerpc/include/asm/lppaca.h | 2 +-
arch/powerpc/include/asm/ppc_asm.h | 4 +-
arch/powerpc/kernel/entry_64.S | 4 +-
arch/powerpc/kernel/time.c | 4 +-
arch/powerpc/platforms/pseries/dtl.c | 6 +-
arch/powerpc/platforms/pseries/setup.c | 6 +-
arch/s390/Kconfig | 1 -
arch/s390/kernel/vtime.c | 6 +-
arch/sh/Kconfig | 1 -
arch/sparc/Kconfig | 1 -
arch/x86/Kconfig | 1 -
arch/x86/kernel/apm_32.c | 11 +-
drivers/isdn/mISDN/stack.c | 7 +-
drivers/staging/iio/trigger/Kconfig | 1 -
fs/binfmt_elf.c | 8 +-
fs/binfmt_elf_fdpic.c | 7 +-
fs/proc/array.c | 4 +-
include/asm-generic/cputime.h | 66 +-----
include/asm-generic/cputime_jiffies.h | 72 ++++++
include/asm-generic/cputime_nsecs.h | 104 +++++++++
include/linux/context_tracking.h | 28 +++
include/linux/hardirq.h | 4 +-
include/linux/init_task.h | 11 +
include/linux/irq_work.h | 20 ++
include/linux/kernel_stat.h | 2 +-
include/linux/kvm_host.h | 55 ++++-
include/linux/posix-timers.h | 1 +
include/linux/printk.h | 3 -
include/linux/profile.h | 13 --
include/linux/rcupdate.h | 8 +
include/linux/sched.h | 50 ++++-
include/linux/tick.h | 26 +++-
include/linux/tsacct_kern.h | 3 +
include/linux/vtime.h | 59 ++++--
init/Kconfig | 28 ++-
kernel/acct.c | 6 +-
kernel/context_tracking.c | 110 ++++++++---
kernel/cpu.c | 4 +-
kernel/delayacct.c | 7 +-
kernel/exit.c | 10 +-
kernel/fork.c | 6 +
kernel/hrtimer.c | 3 +-
kernel/irq_work.c | 131 +++++++++---
kernel/posix-cpu-timers.c | 39 +++-
kernel/printk.c | 36 ++--
kernel/profile.c | 24 --
kernel/rcutree.c | 19 ++-
kernel/rcutree.h | 1 -
kernel/rcutree_plugin.h | 13 +-
kernel/sched/core.c | 105 ++++++++-
kernel/sched/cputime.c | 298 +++++++++++++++++++++++---
kernel/sched/fair.c | 96 ++++++---
kernel/sched/features.h | 3 +
kernel/sched/rt.c | 8 +-
kernel/sched/sched.h | 50 +++++
kernel/sched/stats.h | 8 +-
kernel/sched/stop_task.c | 8 +-
kernel/signal.c | 12 +-
kernel/softirq.c | 11 +-
kernel/time/Kconfig | 9 +
kernel/time/tick-broadcast.c | 3 +-
kernel/time/tick-common.c | 5 +-
kernel/time/tick-sched.c | 144 +++++++++++--
kernel/timer.c | 6 +-
kernel/tsacct.c | 44 +++-
89 files changed, 1489 insertions(+), 522 deletions(-)
--
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