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Subject[ANNOUNCE] 3.8-rc6-nohz4

The support for printk and cputime accounting to work on full dynticks CPUs have
been merged in -tip tree and is likely deemed for the 3.9 merge window. So this
new release is a rebase against the relevant branches in -tip and v3.8-rc6.

The remaining amount of patches has thus quite schrinked.

You can pull this branch from:


Remember it doesn't yet support everything the tick does, namely it lacks
full support for:

- Posix CPU timers
- Perf events
- sched_class::task_tick()
- various other scheduler details
- ...

So use it with caution!


PS: next upstream focus will probably be on posix cpu timers. May be we can try to
make it work using timer_list or hrtimers, I don't know yet. I need to experiment.

Changes since 3.8-rc4-nohz3 (including those of cputime):

* Rebase against v3.8-rc6 and latest tip:/sched/core and tip:/irq/core

* Fix cputime build error with kvm modules (Thanks Sedat Dilek and
Wu Fenguang)

* Fix cputime mistyped header inclusion in ia64

* Fix more missing symbols for kvm

* Removal of profiling's timer hook also applied in -tip

Frederic Weisbecker (26):
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
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
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
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

include/linux/posix-timers.h | 1 +
include/linux/rcupdate.h | 8 +++
include/linux/sched.h | 10 +++-
include/linux/tick.h | 9 +++
kernel/hrtimer.c | 3 +-
kernel/posix-cpu-timers.c | 11 ++++
kernel/rcutree.c | 19 +++++--
kernel/rcutree.h | 1 -
kernel/rcutree_plugin.h | 13 +---
kernel/sched/core.c | 104 ++++++++++++++++++++++++++++++---
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/softirq.c | 5 +-
kernel/time/Kconfig | 9 +++
kernel/time/tick-broadcast.c | 3 +-
kernel/time/tick-common.c | 5 +-
kernel/time/tick-sched.c | 132 +++++++++++++++++++++++++++++++++++++----
kernel/timer.c | 5 +-
22 files changed, 427 insertions(+), 84 deletions(-)


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