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2011-05-19Merge branches 'sched-core-for-linus' and 'sched-urgent-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (60 commits) sched: Fix and optimise calculation of the weight-inverse sched: Avoid going ahead if ->cpus_allowed is not changed sched, rt: Update rq clock when unthrottling of an otherwise idle CPU sched: Remove unused parameters from sched_fork() and wake_up_new_task() sched: Shorten the construction of the span cpu mask of sched domain sched: Wrap the 'cfs_rq->nr_spread_over' field with CONFIG_SCHED_DEBUG sched: Remove unused 'this_best_prio arg' from balance_tasks() sched: Remove noop in alloc_rt_sched_group() sched: Get rid of lock_depth sched: Remove obsolete comment from scheduler_tick() sched: Fix sched_domain iterations vs. RCU sched: Next buddy hint on sleep and preempt path sched: Make set_*_buddy() work on non-task entities sched: Remove need_migrate_task() sched: Move the second half of ttwu() to the remote cpu sched: Restructure ttwu() some more sched: Rename ttwu_post_activation() to ttwu_do_wakeup() sched: Remove rq argument from ttwu_stat() sched: Remove rq->lock from the first half of ttwu() sched: Drop rq->lock from sched_exec() ... * 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: sched: Fix rt_rq runtime leakage bug
2011-05-19Merge branch 'irq-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: irq: Export functions to allow modular irq drivers genirq: Uninline and sanity check generic_handle_irq() genirq: Remove pointless ifdefs genirq: Make generic irq chip depend on CONFIG_GENERIC_IRQ_CHIP genirq: Add chip suspend and resume callbacks genirq: Implement a generic interrupt chip genirq: Support per-IRQ thread disabling. genirq: irq_desc: Document preflow_handler and affinity_hint genirq: Update DocBook comments genirq: Forgotten updates/deletions after removal of compat code
2011-05-19Merge branch 'core-iommu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip * 'core-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: x86, gart: Rename pci-gart_64.c to amd_gart_64.c x86/amd-iommu: Use threaded interupt handler arch/x86/kernel/pci-iommu_table.c: Convert sprintf_symbol to %pS x86/amd-iommu: Add support for invalidate_all command x86/amd-iommu: Add extended feature detection x86/amd-iommu: Add ATS enable/disable code x86/amd-iommu: Add flag to indicate IOTLB support x86/amd-iommu: Flush device IOTLB if ATS is enabled x86/amd-iommu: Select PCI_IOV with AMD IOMMU driver PCI: Move ATS declarations in seperate header file dma-debug: print information about leaked entry x86/amd-iommu: Flush all internal TLBs when IOMMUs are enabled x86/amd-iommu: Rename iommu_flush_device x86/amd-iommu: Improve handling of full command buffer x86/amd-iommu: Rename iommu_flush* to domain_flush* x86/amd-iommu: Remove command buffer resetting logic x86/amd-iommu: Cleanup completion-wait handling x86/amd-iommu: Cleanup inv_pages command handling x86/amd-iommu: Move inv-dte command building to own function x86/amd-iommu: Move compl-wait command building to own function
2011-05-19Merge branch 'for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6 * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/suspend-2.6: (34 commits) PM: Introduce generic prepare and complete callbacks for subsystems PM: Allow drivers to allocate memory from .prepare() callbacks safely PM: Remove CONFIG_PM_VERBOSE Revert "PM / Hibernate: Reduce autotuned default image size" PM / Hibernate: Add sysfs knob to control size of memory for drivers PM / Wakeup: Remove useless synchronize_rcu() call kmod: always provide usermodehelper_disable() PM / ACPI: Remove acpi_sleep=s4_nonvs PM / Wakeup: Fix build warning related to the "wakeup" sysfs file PM: Print a warning if firmware is requested when tasks are frozen PM / Runtime: Rework runtime PM handling during driver removal Freezer: Use SMP barriers PM / Suspend: Do not ignore error codes returned by suspend_enter() PM: Fix build issue in clock_ops.c for CONFIG_PM_RUNTIME unset PM: Revert "driver core: platform_bus: allow runtime override of dev_pm_ops" OMAP1 / PM: Use generic clock manipulation routines for runtime PM PM: Remove sysdev suspend, resume and shutdown operations PM / PowerPC: Use struct syscore_ops instead of sysdevs for PM PM / UNICORE32: Use struct syscore_ops instead of sysdevs for PM PM / AVR32: Use struct syscore_ops instead of sysdevs for PM ...
2011-05-19usb-storage: Correct adjust_quirks to include latest flagsKarl Relton
Commits ae38c78a03e1b77ad45248fcf097e4568e740209 and 00914025cc4e783d4703b4db1d47b41f389e50c8 added quirk flags US_FL_NO_READ_DISC_INFO and US_FL_NO_READ_CAPACITY_16 to the usb-storage driver. However they did not add the corresponding flags to adjust_quirks() in usb.c, so there was no facility for a user to over-ride/add them via the quirks module parameter. Signed-off-by: Karl Relton <karllinuxtest.relton@ntlworld.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-19Revert "rcu: Decrease memory-barrier usage based on semi-formal proof"Paul E. McKenney
This reverts commit e59fb3120becfb36b22ddb8bd27d065d3cdca499. This reversion was due to (extreme) boot-time slowdowns on SPARC seen by Yinghai Lu and on x86 by Ingo . This is a non-trivial reversion due to intervening commits. Conflicts: Documentation/RCU/trace.txt kernel/rcutree.c Signed-off-by: Ingo Molnar <mingo@elte.hu>
2011-05-19hwmon: (pmbus) Add support for Analog Devices ADM1275Guenter Roeck
Add support for Analog Devices ADM1275 Hot-Swap Controller and Digital Power Monitor Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Tom Grennan <tom.grennan@ericsson.com>
2011-05-19hwmon: (pmbus) Support for TI UCD90xxx series Sequencer and System Health ↵Guenter Roeck
Controllers Hardware monitoring support for TI UCD90120, UCD90124, UCD9090, and UCD90910 Sequencer and System Health Controllers. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Tom Grennan <tom.grennan@ericsson.com>
2011-05-19hwmon: (pmbus) Add support for TI UCD9200 series of PWM System ControllersGuenter Roeck
This patch adds hardware monitoring support for TI UCD9220, UCD9222, UCD9224, UCD9240, UCD9244, UCD9246, and UCD9248 Digital PWM System Controllers. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Tom Grennan <tom.grennan@ericsson.com>
2011-05-19hwmon: Driver for MAX16065 System Manager and compatiblesGuenter Roeck
This patch adds hardware monitoring support for Maxim MAX16065, MAX16066, MAX16067, MAX16068, MAX16070, and MAX16071 flash-configurable system managers with nonvolatile fault registers. Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com> Reviewed-by: Jean Delvare <khali@linux-fr.org>
2011-05-19hwmon: (sht15) add support for CRC validationJerome Oufella
The sht15 sensor allows validating exchanges to and from the device using a crc8 function. An utility function to reverse a byte has also been added. Signed-off-by: Jerome Oufella <jerome.oufella@savoirfairelinux.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-05-19hwmon: (sht15) add support for the status registerVivien Didelot
* Add support for: - Heater. - End of battery notice. - Ability not to reload from OTP. - Low resolution (12bit temp, 8bit humidity). * Add an utility function to read individual bytes from the device. Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-05-19hwmon: (sht15) general code clean-upVivien Didelot
* Add a documentation file for the device. * Respect a bit more the kernel-doc syntax. * Rename some variables for clarity. * Use bool type for flags. * Use an enum for states (actions being done). Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com> Acked-by: Jonathan Cameron <jic23@cam.ac.uk> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-05-19hwmon: Add support for MAX6642Per Dalén
MAX6642 is a SMBus-Compatible Remote/Local Temperature Sensor with Overtemperature Alarm from Maxim. Signed-off-by: Per Dalen <per.dalen@appeartv.com> Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
2011-05-19powerpc: Integrated Flash controller device tree bindingsDipen Dudhat
Signed-off-by: Dipen Dudhat <Dipen.Dudhat@freescale.com> Acked-By: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-05-19powerpc: Adding bindings for flexcan controllerBhaskar Upadhaya
Signed-off-by: Bhaskar Upadhaya <bhaskar.upadhaya@freescale.com> Acked-By: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-05-19powerpc: Add fsl mpic timer bindingScott Wood
Update the existing example in the general mpic binding to have a separate TCRx region. Currently the example doesn't describe TCRx at all. The one upstream device tree with an mpic timer node (p1022ds) uses one large reg region to describe both, even though there are other unrelated registers in between. That device tree also contains a bogus interrupt specifier, and there's no upstream software that uses this yet, so changing this shouldn't be a problem. Add a full binding for the MPIC timer node, not just an example of 4-cell interrupts in the MPIC binding. Add fsl,available-ranges, similar to msi-available-ranges. Signed-off-by: Scott Wood <scottwood@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2011-05-18Merge branch 'master' into upstream.Jiri Kosina
This is sync with Linus' tree to receive KEY_IMAGES definition that went in through input tree.
2011-05-18HID: roccat: fix actual/startup profile sysfs attribute in koneplusStefan Achatz
startup_profile and actual_profile didn't work as expected. Also as the actual profile is persistent, the distinction between the two was ambiguous, so both use the same code now and startup_profile has been deprecated. Also the event is now propagated through chardev. The userland tool has been updated to support this change. Signed-off-by: Stefan Achatz <erazor_de@users.sourceforge.net> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-05-17x86, cpu: Enable/disable Supervisor Mode Execution ProtectionFenghua Yu
Enable/disable newly documented SMEP (Supervisor Mode Execution Protection) CPU feature in kernel. CR4.SMEP (bit 20) is 0 at power-on. If the feature is supported by CPU (X86_FEATURE_SMEP), enable SMEP by setting CR4.SMEP. New kernel option nosmep disables the feature even if the feature is supported by CPU. [ hpa: moved the call to setup_smep() until after the vendor-specific initialization; that ensures that CPUID features are unmasked. We will still run it before we have userspace (never mind uncontrolled userspace). ] Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> LKML-Reference: <1305157865-31727-1-git-send-email-fenghua.yu@intel.com> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2011-05-17PM: Allow drivers to allocate memory from .prepare() callbacks safelyRafael J. Wysocki
If device drivers allocate substantial amounts of memory (above 1 MB) in their hibernate .freeze() callbacks (or in their legacy suspend callbcks during hibernation), the subsequent creation of hibernate image may fail due to the lack of memory. This is the case, because the drivers' .freeze() callbacks are executed after the hibernate memory preallocation has been carried out and the preallocated amount of memory may be too small to cover the new driver allocations. Unfortunately, the drivers' .prepare() callbacks also are executed after the hibernate memory preallocation has completed, so they are not suitable for allocating additional memory either. Thus the only way a driver can safely allocate memory during hibernation is to use a hibernate/suspend notifier. However, the notifiers are called before the freezing of user space and the drivers wanting to use them for allocating additional memory may not know how much memory needs to be allocated at that point. To let device drivers overcome this difficulty rework the hibernation sequence so that the memory preallocation is carried out after the drivers' .prepare() callbacks have been executed, so that the .prepare() callbacks can be used for allocating additional memory to be used by the drivers' .freeze() callbacks. Update documentation to match the new behavior of the code. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-05-17PM / Hibernate: Add sysfs knob to control size of memory for driversRafael J. Wysocki
Martin reports that on his system hibernation occasionally fails due to the lack of memory, because the radeon driver apparently allocates too much of it during the device freeze stage. It turns out that the amount of memory allocated by radeon during hibernation (and presumably during system suspend too) depends on the utilization of the GPU (e.g. hibernating while there are two KDE 4 sessions with compositing enabled causes radeon to allocate more memory than for one KDE 4 session). In principle it should be possible to use image_size to make the memory preallocation mechanism free enough memory for the radeon driver, but in practice it is not easy to guess the right value because of the way the preallocation code uses image_size. For this reason, it seems reasonable to allow users to control the amount of memory reserved for driver allocations made after the hibernate preallocation, which currently is constant and amounts to 1 MB. Introduce a new sysfs file, /sys/power/reserved_size, whose value will be used as the amount of memory to reserve for the post-preallocation reservations made by device drivers, in bytes. For backwards compatibility, set its default (and initial) value to the currently used number (1 MB). References: https://bugzilla.kernel.org/show_bug.cgi?id=34102 Reported-and-tested-by: Martin Steigerwald <Martin@Lichtvoll.de> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-05-17PM / ACPI: Remove acpi_sleep=s4_nonvsAmerigo Wang
acpi_sleep=s4_nonvs is superseded by acpi_sleep=nonvs, so remove it. Signed-off-by: WANG Cong <amwang@redhat.com> Acked-by: Pavel Machek <pavel@ucw.cz> Acked-by: Len Brown <lenb@kernel.org> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
2011-05-17doc: timers-howto: fix a typo ("unsgined")Jonathan Neuschäfer
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-05-16Input: elantech - describe further the protocolÉric Piel
For some Dell laptops, Ubuntu had a special version of the elantech driver with more knowledge on the devices. It can be found there: http://zinc.ubuntu.com/git?p=mid-team/hardy-netbook.git;a=blob;f=drivers/input/mouse/elantech.c;h=d0e2cafed162428f72e3654f4dda85e08ea486b3;hb=refs/heads/abi-22 By inspecting the source code, and doing some test on a real hardware, I have completed the protocol specification (especially for the 6 bytes protocol). It also adds information about the mapping between the version reported by the device and the protocol to use. Signed-off-by: Éric Piel <eric.piel@tremplin-utc.net> Reviewed-by: Henrik Rydberg <rydberg@euromail.se> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-05-16Merge branch 'master' of ↵John W. Linville
git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem Conflicts: drivers/net/wireless/iwlwifi/iwl-agn-tx.c net/mac80211/sta_info.h
2011-05-16Documentation, ABI: Update L3 cache index disable textBorislav Petkov
Change contact person to AMD kernel mailing list, update text and external references, drop "Users:" tag. Cc: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Borislav Petkov <borislav.petkov@amd.com> Link: http://lkml.kernel.org/r/1305553188-21061-4-git-send-email-bp@amd64.org Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2011-05-13Kernel documentation for the PTI feature.J Freyensee
This provides Kernel documentation for the PTI feature and setting line discipline drivers on top of tty's for Linux mobile solutions. Signed-off-by: J Freyensee <james_p_freyensee@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-13UBIFS: make force in-the-gaps to be a general self-checkArtem Bityutskiy
UBIFS can force itself to use the 'in-the-gaps' commit method - the last resort method which is normally invoced very very rarely. Currently this "force int-the-gaps" debugging feature is a separate test mode. But it is a bit saner to make it to be the "general" self-test check instead. This patch is just a clean-up which should make the debugging code look a bit nicer and easier to use - we have way too many debugging options. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
2011-05-12Input: rotary-encoder - add support for half-period encodersJohan Hovold
Add support for encoders that have two detents per input signal period. Signed-off-by: Johan Hovold <jhovold@gmail.com> Acked-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2011-05-12Merge commit 'v2.6.39-rc7' into sched/coreIngo Molnar
2011-05-11KVM: X86: Implement userspace interface to set virtual_tsc_khzJoerg Roedel
This patch implements two new vm-ioctls to get and set the virtual_tsc_khz if the machine supports tsc-scaling. Setting the tsc-frequency is only possible before userspace creates any vcpu. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Avi Kivity <avi@redhat.com>
2011-05-10Merge branch 2.6.39-rc7 into usb-linusGreg Kroah-Hartman
This was needed to resolve a conflict in: drivers/usb/host/isp1760-hcd.c Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-10bcma: add Broadcom specific AMBA bus driverRafał Miłecki
Broadcom has released cards based on a new AMBA-based bus type. From a programming point of view, this new bus type differs from AMBA and does not use AMBA common registers. It also differs enough from SSB. We decided that a new bus driver is needed to keep the code clean. In its current form, the driver detects devices present on the bus and registers them in the system. It allows registering BCMA drivers for specified bus devices and provides them basic operations. The bus driver itself includes two important bus managing drivers: ChipCommon core driver and PCI(c) core driver. They are early used to allow correct initialization. Currently code is limited to supporting buses on PCI(e) devices, however the driver is designed to be used also on other hosts. The host abstraction layer is implemented and already used for PCI(e). Support for PCI(e) hosts is working and seems to be stable (access to 80211 core was tested successfully on a few devices). We can still optimize it by using some fixed windows, but this can be done later without affecting any external code. Windows are just ranges in MMIO used for accessing cores on the bus. Cc: Greg KH <greg@kroah.com> Cc: Michael Büsch <mb@bu3sch.de> Cc: Larry Finger <Larry.Finger@lwfinger.net> Cc: George Kashperko <george@znau.edu.ua> Cc: Arend van Spriel <arend@broadcom.com> Cc: linux-arm-kernel@lists.infradead.org Cc: Russell King <rmk@arm.linux.org.uk> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Andy Botting <andy@andybotting.com> Cc: linuxdriverproject <devel@linuxdriverproject.org> Cc: linux-kernel@vger.kernel.org <linux-kernel@vger.kernel.org> Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
2011-05-10x86, gart: Rename pci-gart_64.c to amd_gart_64.cJoerg Roedel
This file only contains code relevant for the northbridge gart in AMD processors. This patch renames the file to represent this fact in the filename. Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
2011-05-10treewide: fix a few typos in commentsJustin P. Mattock
- kenrel -> kernel - whetehr -> whether - ttt -> tt - sss -> ss Signed-off-by: Justin P. Mattock <justinmattock@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2011-05-08Merge branch 'batman-adv/next' of git://git.open-mesh.org/ecsv/linux-mergeDavid S. Miller
2011-05-08batman-adv: rename everything from *hna* into *tt* (translation table)Antonio Quartulli
To be coherent, all the functions/variables/constants have been renamed to the TranslationTable style Signed-off-by: Antonio Quartulli <ordex@autistici.org> Signed-off-by: Sven Eckelmann <sven@narfation.org>
2011-05-06driver core: remove the driver-model structures from the documentationWanlong Gao
Remove the struct bus_type, class, device, device_driver from the driver-model docs. With another patch add them to device.h, since they are out of date. That will keep things up to date and provide a better way to document this stuff. Signed-off-by: Wanlong Gao <wanlong.gao@gmail.com> Acked-by: Harry Wei <harryxiyou@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-06driver core: Add the device driver-model structures to kerneldocWanlong Gao
Add the comments to the structure bus_type, device_driver, device, class to device.h for generating the driver-model kerneldoc. With another patch these all removed from the files in Documentation/driver-model/ since they are out of date. That will keep things up to date and provide a better way to document this stuff. Signed-off-by: Wanlong Gao <wanlong.gao@gmail.com> Acked-by: Harry Wei <harryxiyou@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-06Translated Documentation/email-clients.txtHarry Wei
The patch includes the translation Documentation/email-clients.txt. If anyone has other problems, please let me know. Signed-off-by: Harry Wei <harryxiyou@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2011-05-06Correct occurrences ofRob Landley
- Documentation/kvm/ to Documentation/virtual/kvm - Documentation/uml/ to Documentation/virtual/uml - Documentation/lguest/ to Documentation/virtual/lguest throughout the kernel source tree. Signed-off-by: Rob Landley <rob@landley.net> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
2011-05-06Add a 00-INDEX file to Documentation/virtualRob Landley
Remove uml from the top level 00-INDEX file. Signed-off-by: Rob Landley <rlandley@parallels.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
2011-05-06Move kvm, uml, and lguest subdirectories under a common "virtual" directory, ↵Rob Landley
I.E: cd Documentation mkdir virtual git mv kvm uml lguest virtual Signed-off-by: Rob Landley <rlandley@parallels.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
2011-05-05rcu: Add forward-progress diagnostic for per-CPU kthreadsPaul E. McKenney
Increment a per-CPU counter on each pass through rcu_cpu_kthread()'s service loop, and add it to the rcudata trace output. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-05rcu: add grace-period age and more kthread state to tracingPaul E. McKenney
This commit adds the age in jiffies of the current grace period along with the duration in jiffies of the longest grace period since boot to the rcu/rcugp debugfs file. It also adds an additional "O" state to kthread tracing to differentiate between the kthread waiting due to having nothing to do on the one hand and waiting due to being on the wrong CPU on the other hand. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2011-05-05rcu: update tracing documentation for new rcutorture and rcuboostPaul E. McKenney
This commit documents the new debugfs rcu/rcutorture and rcu/rcuboost trace files. The description has been updated as suggested by Josh Triplett. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
2011-05-05rcu: add callback-queue information to rcudata outputPaul E. McKenney
This commit adds an indication of the state of the callback queue using a string of four characters following the "ql=" integer queue length. The first character is "N" if there are callbacks that have been queued that are not yet ready to be handled by the next grace period, or "." otherwise. The second character is "R" if there are callbacks queued that are ready to be handled by the next grace period, or "." otherwise. The third character is "W" if there are callbacks waiting for the current grace period, or "." otherwise. Finally, the fourth character is "D" if there are callbacks that have been handled by a prior grace period and are waiting to be invoked, or ".". Note that callbacks that are in the process of being invoked are not shown. These callbacks would have been removed from the rcu_data structure's list by rcu_do_batch() prior to being executed. (These callbacks are also not reflected in the "ql=" total, FWIW.) Also, document the new callback-queue trace information. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-05rcu: Update RCU's trace.txt documentation for new formatPaul E. McKenney
The trace.txt file had obsolete output for the debugfs rcu/rcudata file, so update it. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-05-05rcu: move TREE_RCU from softirq to kthreadPaul E. McKenney
If RCU priority boosting is to be meaningful, callback invocation must be boosted in addition to preempted RCU readers. Otherwise, in presence of CPU real-time threads, the grace period ends, but the callbacks don't get invoked. If the callbacks don't get invoked, the associated memory doesn't get freed, so the system is still subject to OOM. But it is not reasonable to priority-boost RCU_SOFTIRQ, so this commit moves the callback invocations to a kthread, which can be boosted easily. Also add comments and properly synchronized all accesses to rcu_cpu_kthread_task, as suggested by Lai Jiangshan. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>