Hi Linus, please pull from: git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux-idle-2.6.git idle-release The new intel_idle driver provides a method to use an optimized idle loop on machines without using ACPI. This will update the files shown below. thanks! Len Brown Intel Open Source Technology Center ps. individual patches are available on linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx and a consolidated plain patch is available here: http://ftp.kernel.org/pub/linux/kernel/people/lenb/idle/patches/2.6.34/idle-release-2.6.34.diff.gz MAINTAINERS | 7 + arch/x86/include/asm/thread_info.h | 4 +- drivers/Makefile | 2 +- drivers/acpi/acpi_pad.c | 9 - drivers/acpi/processor_driver.c | 15 +- drivers/acpi/processor_idle.c | 28 ++- drivers/cpuidle/cpuidle.c | 12 +- drivers/cpuidle/cpuidle.h | 1 - drivers/cpuidle/driver.c | 16 +- drivers/cpuidle/sysfs.c | 5 +- drivers/idle/Kconfig | 11 + drivers/idle/Makefile | 1 + drivers/idle/intel_idle.c | 461 ++++++++++++++++++++++++++++++++++++ include/linux/cpuidle.h | 8 +- 14 files changed, 538 insertions(+), 42 deletions(-) create mode 100755 drivers/idle/intel_idle.c through these commits: Len Brown (8): cpuidle: fail to register if !CONFIG_CPU_IDLE cpuidle: add cpuidle_unregister_driver() error check cpuidle: make cpuidle_curr_driver static ACPI: allow a native cpuidle driver to displace ACPI sched: clarify commment for TS_POLLING acpi_pad: uses MONITOR/MWAIT, so it doesn't need to clear TS_POLLING ACPI: acpi_idle: touch TS_POLLING only in the non-MWAIT case intel_idle: native hardware cpuidle driver for latest Intel processors with this log: commit 2671717265ae6e720a9ba5f13fbec3a718983b65 Author: Len Brown <len.brown@xxxxxxxxx> Date: Mon Mar 8 14:07:30 2010 -0500 intel_idle: native hardware cpuidle driver for latest Intel processors This EXPERIMENTAL driver supersedes acpi_idle on Intel Atom Processors, Intel Core i3/i5/i7 Processors and associated Intel Xeon processors. It does not support the Intel Core2 processor or earlier. For kernels configured with ACPI, CONFIG_INTEL_IDLE=y allows intel_idle to probe before the ACPI processor driver. Booting with "intel_idle.max_cstate=0" disables intel_idle and the system will fall back on ACPI's "acpi_idle". Typical Linux distributions load ACPI processor module early, making CONFIG_INTEL_IDLE=m not easily useful on ACPI platforms. intel_idle probes all processors at module_init time. Processors that are hot-added later will be limited to using C1 in idle. Signed-off-by: Len Brown <len.brown@xxxxxxxxx> commit 02cf4f9808382af7265cafc33dc86ec5875526aa Author: Len Brown <len.brown@xxxxxxxxx> Date: Mon May 24 14:27:44 2010 -0400 ACPI: acpi_idle: touch TS_POLLING only in the non-MWAIT case commit d306ebc28649b89877a22158fe0076f06cc46f60 (ACPI: Be in TS_POLLING state during mwait based C-state entry) fixed an important power & performance issue where ACPI c2 and c3 C-states were clearing TS_POLLING even when using MWAIT (ACPI_STATE_FFH). That bug had been causing us to receive redundant scheduling interrups when we had already been woken up by MONITOR/MWAIT. Following up on that... In the MWAIT case, we don't have to subsequently check need_resched(), as that c heck was there for the TS_POLLING-clearing case. Note that not only does the cpuidle calling function already check need_resched() before calling us, the low-level entry into monitor/mwait calls it twice -- guaranteeing that a write to the trigger address can not go un-noticed. Also, in this case, we don't have to set TS_POLLING when we wake, because we never cleared it. Signed-off-by: Len Brown <len.brown@xxxxxxxxx> Acked-by: Venkatesh Pallipadi <venki@xxxxxxxxxx> commit a7d27c37533524e23bbdc9ba1d78e3241b7483ea Author: Len Brown <len.brown@xxxxxxxxx> Date: Mon May 24 11:41:00 2010 -0400 acpi_pad: uses MONITOR/MWAIT, so it doesn't need to clear TS_POLLING api_pad exclusively uses MONITOR/MWAIT to sleep in idle, so it does not need the wakeup IPI during idle sleep that is provoked by clearing TS_POLLING. Signed-off-by: Len Brown <len.brown@xxxxxxxxx> Cc: Shaohua Li <shaohua.li@xxxxxxxxx> commit e45b7fa23097332508730123ac6d59227e7bd7f8 Author: Len Brown <len.brown@xxxxxxxxx> Date: Mon May 24 11:34:36 2010 -0400 sched: clarify commment for TS_POLLING TS_POLLING set tells the scheduler an idle_task will poll need_resched() to look for work. TS_POLLING clear tells resched_task() and wake_up_idle_cpu() that the remote CPU's idle_task is now sleeping in idle, and thus requires a reschedule interrupt notice work. Update the description of TS_POLLING to reflect how it works. "idle task polling need_resched, skip sending interrupt" Wordsmithing-by: Milton Miller <miltonm@xxxxxxx> Signed-off-by: Len Brown <len.brown@xxxxxxxxx> Acked-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx> commit 541adf7cd937b3895c7645406a9b060504df453b Author: Len Brown <len.brown@xxxxxxxxx> Date: Sat May 22 17:03:29 2010 -0400 ACPI: allow a native cpuidle driver to displace ACPI The ACPI driver would fail probe when it found that another driver had previously registered with cpuidle. But this is a natural situation, as a native hardware cpuidle driver should be able to bind instead of ACPI, and the ACPI processor driver should be able to handle yielding control of C-states while still handling P-states and T-states. Add a KERN_DEBUG line showing when acpi_idle does successfully register. Signed-off-by: Len Brown <len.brown@xxxxxxxxx> commit 752138df0dc2daaae09379c754caeb08c97905dc Author: Len Brown <len.brown@xxxxxxxxx> Date: Sat May 22 16:57:26 2010 -0400 cpuidle: make cpuidle_curr_driver static cpuidle_register_driver() sets cpuidle_curr_driver cpuidle_unregister_driver() clears cpuidle_curr_driver We should't expose cpuidle_curr_driver to potential modification except via these interfaces. So make it static and create cpuidle_get_driver() to observe it. Signed-off-by: Len Brown <len.brown@xxxxxxxxx> commit c0d64cb031c21f163a0ec15cf10844bcf0ceedcf Author: Len Brown <len.brown@xxxxxxxxx> Date: Sat May 22 16:34:10 2010 -0400 cpuidle: add cpuidle_unregister_driver() error check Assure that cpuidle_unregister_driver() will not clobber the registered driver if unregistered by somebody else. Signed-off-by: Len Brown <len.brown@xxxxxxxxx> commit 6b2c676bf32be91f43215d5874c07c1becaba013 Author: Len Brown <len.brown@xxxxxxxxx> Date: Tue May 11 16:50:52 2010 -0400 cpuidle: fail to register if !CONFIG_CPU_IDLE Signed-off-by: Len Brown <len.brown@xxxxxxxxx> _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
