Paul E. McKenney 34ed62461a rcu: Remove restrictions on no-CBs CPUs ...

Currently, CPU 0 is constrained to not be a no-CBs CPU, and furthermore
at least one no-CBs CPU must remain online at any given time.  These
restrictions are problematic in some situations, such as cases where
all CPUs must run a real-time workload that needs to be insulated from
OS jitter and latencies due to RCU callback invocation.  This commit
therefore provides no-CBs CPUs a (very crude and energy-inefficient)
way to start and to wait for grace periods independently of the normal
RCU callback mechanisms.  This approach allows any or all of the CPUs to
be designated as no-CBs CPUs, and allows any proper subset of the CPUs
(whether no-CBs CPUs or not) to be offlined.

This commit also provides a fix for a locking bug spotted by Xie
ChanglongX <changlongx.xie@intel.com>.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

2013-03-12 11:17:51 -07:00

..

debug

Merge tag 'for_linux-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/kgdb

2013-03-02 08:31:39 -08:00

events

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

gcov

kernel/gcov: remove depends on CONFIG_EXPERIMENTAL

2013-01-11 11:39:33 -08:00

irq

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

power

Merge tag 'driver-core-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

2013-02-21 12:05:51 -08:00

sched

Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block

2013-02-28 12:52:24 -08:00

time

Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux

2013-02-28 19:48:26 -08:00

trace

Merge tag 'metag-v3.9-rc1-v4' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag

2013-03-03 12:06:09 -08:00

.gitignore

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acct.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

async.c

Merge branch 'for-3.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2013-02-19 22:01:33 -08:00

audit_tree.c

audit: catch possible NULL audit buffers

2013-01-11 14:54:55 -08:00

audit_watch.c

audit: catch possible NULL audit buffers

2013-01-11 14:54:55 -08:00

audit.c

kernel/audit.c: avoid negative sleep durations

2013-01-11 14:54:56 -08:00

audit.h

audit: optimize audit_compare_dname_path

2012-10-12 00:32:02 -04:00

auditfilter.c

audit: fix auditfilter.c kernel-doc warnings

2013-01-10 14:35:23 -08:00

auditsc.c

audit: catch possible NULL audit buffers

2013-01-11 14:54:55 -08:00

backtracetest.c

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bounds.c

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capability.c

userns: Teach inode_capable to understand inodes whose uids map to other namespaces.

2012-05-15 14:59:24 -07:00

cgroup_freezer.c

cgroup: rename ->create/post_create/pre_destroy/destroy() to ->css_alloc/online/offline/free()

2012-11-19 08:13:38 -08:00

cgroup.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

compat.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

configs.c

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context_tracking.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 18:19:48 -08:00

cpu_pm.c

kernel/cpu_pm.c: fix various typos

2012-05-31 17:49:27 -07:00

cpu.c

Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 19:04:55 -08:00

cpuset.c

Merge branch 'for-3.9-cpuset' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2013-02-20 09:18:31 -08:00

crash_dump.c

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cred.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2012-12-18 10:55:28 -08:00

delayacct.c

cputime: Use accessors to read task cputime stats

2013-01-27 19:23:31 +01:00

dma.c

Remove all #inclusions of asm/system.h

2012-03-28 18:30:03 +01:00

elfcore.c

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exec_domain.c

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exit.c

coredump: use a freezable_schedule for the coredump_finish wait

2013-02-27 19:10:11 -08:00

extable.c

extable: Skip sorting if sorted at build time.

2012-04-19 15:06:55 -07:00

fork.c

fork: unshare: remove dead code

2013-02-27 19:10:12 -08:00

freezer.c

freezer: change ptrace_stop/do_signal_stop to use freezable_schedule()

2012-10-26 14:27:49 -07:00

futex_compat.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-02-23 18:50:11 -08:00

futex.c

more file_inode() open-coded instances

2013-02-27 16:59:05 -05:00

groups.c

userns: Convert in_group_p and in_egroup_p to use kgid_t

2012-05-03 03:29:33 -07:00

hrtimer.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 19:05:45 -08:00

hung_task.c

hung task debugging: Inject NMI when hung and going to panic

2012-04-25 12:39:25 +02:00

irq_work.c

Merge branch 'nohz/printk-v8' into irq/core

2013-02-05 00:48:46 +01:00

itimer.c

itimer: Use printk_once instead of WARN_ONCE

2012-04-10 11:00:30 +02:00

jump_label.c

jump_label: Export jump_label_rate_limit()

2012-08-06 19:00:35 +03:00

kallsyms.c

vsprintf: fix %ps on non symbols when using kallsyms

2012-05-29 16:22:32 -07:00

kcmp.c

kcmp: include linux/ptrace.h

2012-12-20 17:40:19 -08:00

Kconfig.freezer

…

Kconfig.hz

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Kconfig.locks

locking: Adjust spin lock inlining Kconfig options

2012-09-13 17:56:13 +02:00

Kconfig.preempt

locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage

2012-03-23 13:18:57 +01:00

kexec.c

kexec: avoid freeing NULL pointer in image_crash_alloc()

2013-02-27 19:10:12 -08:00

kmod.c

Merge branch 'master' into for-3.9-async

2013-01-23 09:31:01 -08:00

kprobes.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

ksysfs.c

Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2012-12-11 18:10:49 -08:00

kthread.c

kthread: use N_MEMORY instead N_HIGH_MEMORY

2012-12-12 17:38:33 -08:00

latencytop.c

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lglock.c

brlocks/lglocks: turn into functions

2012-05-29 23:28:41 -04:00

lockdep_internals.h

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lockdep_proc.c

lockdep: Use KSYM_NAME_LEN'ed buffer for __get_key_name()

2012-10-24 12:39:09 +02:00

lockdep_states.h

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lockdep.c

lockdep: check that no locks held at freeze time

2013-02-27 19:10:11 -08:00

Makefile

Merge branch 'akpm' (final batch from Andrew)

2013-02-27 20:58:09 -08:00

modsign_certificate.S

MODSIGN: Avoid using .incbin in C source

2012-12-14 13:06:44 +10:30

modsign_pubkey.c

keys: use keyring_alloc() to create module signing keyring

2012-12-20 17:40:21 -08:00

module_signing.c

MODSIGN: Don't use enum-type bitfields in module signature info block

2012-12-05 11:27:24 +10:30

module-internal.h

MODSIGN: Move the magic string to the end of a module and eliminate the search

2012-10-19 17:30:40 -07:00

module.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

mutex-debug.c

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mutex-debug.h

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mutex.c

sched/rt: Move rt specific bits into new header file

2013-02-07 20:51:08 +01:00

mutex.h

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notifier.c

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nsproxy.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2013-02-26 20:16:07 -08:00

padata.c

padata: use __this_cpu_read per-cpu helper

2012-12-06 17:16:23 +08:00

panic.c

taint: add explicit flag to show whether lock dep is still OK.

2013-01-21 17:17:57 +10:30

params.c

params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)

2012-05-04 17:28:18 -07:00

pid_namespace.c

pidns: Stop pid allocation when init dies

2012-12-25 16:10:05 -08:00

pid.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

posix-cpu-timers.c

Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 19:05:45 -08:00

posix-timers.c

posix-timers: convert to idr_alloc()

2013-02-27 19:10:19 -08:00

printk.c

Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux

2013-02-25 16:46:44 -08:00

profile.c

profiling: Remove unused timer hook

2013-01-24 15:37:26 +01:00

ptrace.c

uprobes: Add exports for module use

2013-02-08 17:47:13 +01:00

range.c

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rcu.h

rcu: Provide RCU CPU stall warnings for tiny RCU

2013-01-28 22:06:21 -08:00

rcupdate.c

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-28 22:25:21 -08:00

rcutiny_plugin.h

rcu: Provide RCU CPU stall warnings for tiny RCU

2013-01-28 22:06:21 -08:00

rcutiny.c

Merge branches 'doctorture.2013.01.29a', 'fixes.2013.01.26a', 'tagcb.2013.01.24a' and 'tiny.2013.01.29b' into HEAD

2013-01-28 22:25:21 -08:00

rcutorture.c

rcu: Allow rcutorture to be built at low optimization levels

2013-02-04 12:18:20 -08:00

rcutree_plugin.h

rcu: Remove restrictions on no-CBs CPUs

2013-03-12 11:17:51 -07:00

rcutree_trace.c

rcu: Separate accounting of callbacks from callback-free CPUs

2012-11-16 10:05:57 -08:00

rcutree.c

rcu: Remove restrictions on no-CBs CPUs

2013-03-12 11:17:51 -07:00

rcutree.h

rcu: Remove restrictions on no-CBs CPUs

2013-03-12 11:17:51 -07:00

relay.c

new helper: file_inode(file)

2013-02-22 23:31:31 -05:00

res_counter.c

res_counter: return amount of charges after res_counter_uncharge()

2012-12-18 15:02:12 -08:00

resource.c

kernel/resource.c: fix stack overflow in __reserve_region_with_split()

2012-10-06 03:05:31 +09:00

rtmutex_common.h

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rtmutex-debug.c

sched/rt: Move rt specific bits into new header file

2013-02-07 20:51:08 +01:00

rtmutex-debug.h

…

rtmutex-tester.c

sched/rt: Move rt specific bits into new header file

2013-02-07 20:51:08 +01:00

rtmutex.c

sched/rt: Move rt specific bits into new header file

2013-02-07 20:51:08 +01:00

rtmutex.h

…

rwsem.c

lockdep, rwsem: provide down_write_nest_lock()

2013-01-11 14:54:55 -08:00

seccomp.c

seccomp: Make syscall skipping and nr changes more consistent

2012-10-02 21:14:29 +10:00

semaphore.c

semaphore: fix improper comment reference to mutex

2012-04-05 17:15:55 -07:00

signal.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

2013-03-02 19:32:06 -08:00

smp.c

smp: make smp_call_function_many() use logic similar to smp_call_function_single()

2013-02-21 17:22:20 -08:00

smpboot.c

Revert parts of "hlist: drop the node parameter from iterators"

2013-03-08 15:05:34 -08:00

smpboot.h

smpboot: Provide infrastructure for percpu hotplug threads

2012-08-13 17:01:07 +02:00

softirq.c

Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-03-05 18:10:04 -08:00

spinlock.c

locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage

2012-03-23 13:18:57 +01:00

srcu.c

srcu: use ACCESS_ONCE() to access sp->completed in srcu_read_lock()

2013-02-07 15:19:36 -08:00

stacktrace.c

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stop_machine.c

stop_machine: Mark per cpu stopper enabled early

2013-02-26 22:25:17 +01:00

sys_ni.c

module: add syscall to load module from fd

2012-12-14 13:05:22 +10:30

sys.c

usermodehelper: cleanup/fix __orderly_poweroff() && argv_free()

2013-02-27 19:10:09 -08:00

sysctl_binary.c

sysctl: fix null checking in bin_dn_node_address()

2013-02-27 19:10:21 -08:00

sysctl.c

Merge tag 'arc-v3.9-rc1-late' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

2013-03-02 07:58:56 -08:00

task_work.c

task_work: task_work_add() should not succeed after exit_task_work()

2012-09-13 16:47:34 +02:00

taskstats.c

taskstats: cgroupstats_user_cmd() may leak on error

2012-10-06 03:05:31 +09:00

test_kprobes.c

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time.c

time: don't inline EXPORT_SYMBOL functions

2013-02-21 17:22:19 -08:00

timeconst.bc

kernel: Replace timeconst.pl with a bc script

2013-02-16 23:17:25 +01:00

timer.c

Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-19 18:19:48 -08:00

tracepoint.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

tsacct.c

cputime: Use accessors to read task cputime stats

2013-01-27 19:23:31 +01:00

uid16.c

userns: Convert setting and getting uid and gid system calls to use kuid and kgid

2012-05-03 03:28:41 -07:00

up.c

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user_namespace.c

userns: Allow any uid or gid mappings that don't overlap.

2013-01-26 22:12:04 -08:00

user-return-notifier.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

user.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00

utsname_sysctl.c

kernel/utsname_sysctl.c: put get/get_uts() into CONFIG_PROC_SYSCTL code block

2013-02-27 19:10:22 -08:00

utsname.c

kernel/utsname.c: fix wrong comment about clone_uts_ns()

2013-02-27 19:10:22 -08:00

wait.c

propagate name change to comments in kernel source

2012-12-06 10:39:54 +01:00

watchdog.c

Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2013-02-22 19:25:09 -08:00

workqueue_internal.h

workqueue: rename cpu_workqueue to pool_workqueue

2013-02-13 19:29:12 -08:00

workqueue.c

hlist: drop the node parameter from iterators

2013-02-27 19:10:24 -08:00