commit 91d1aa43 (context_tracking: New context tracking susbsystem) generalized parts of the RCU userspace extended quiescent state into the context tracking subsystem. Context tracking is then used to implement adaptive tickless (a.k.a full nohz)
Mainline currently only includes x86 support for the context tracking susbsystem and the goal of this series is to add ARM support, in order to make adaptive tickless functional on ARM.
Depends on the prerequistes series: [PATCH 0/3] ARM: context tracking support prerequisites http://marc.info/?l=linux-kernel&m=136382248131438&w=2
Both of which are combined on top of Frederic's 3.9-rc1-nohz1 branch and available here: git://git.kernel.org/pub/scm/linux/kernel/git/khilman/linux.git arm-nohz-v2/context-tracking
Using this, I tested adaptive tickless on a 2 CPU ARM SoC (OMAP4 Panda.)
Kevin Hilman (4): ARM: context tracking: add exception support ARM: context tracking: instrument system calls ARM: context tracking: handle post exception/syscall/IRQ work ARM: Kconfig: allow context tracking
arch/arm/Kconfig | 1 + arch/arm/include/asm/thread_info.h | 4 +++- arch/arm/kernel/ptrace.c | 11 +++++++++++ arch/arm/kernel/signal.c | 12 +++++++++--- arch/arm/kernel/traps.c | 18 +++++++++++++++++- arch/arm/mm/fault.c | 32 +++++++++++++++++++++++++++----- 6 files changed, 68 insertions(+), 10 deletions(-)