Kirill Tkhai a1e0182979 sched: Remove double_rq_lock() from __migrate_task() ...

Avoid double_rq_lock() and use TASK_ON_RQ_MIGRATING for
__migrate_task(). The advantage is (obviously) not holding two
rq->lock's at the same time and thereby increasing parallelism.

The important point to note is that because we acquire dst->lock
immediately after releasing src->lock the potential wait time of
task_rq_lock() callers on TASK_ON_RQ_MIGRATING is not longer
than it would have been in the double rq lock scenario.

Signed-off-by: Kirill Tkhai <ktkhai@parallels.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Paul Turner <pjt@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Kirill Tkhai <tkhai@yandex.ru>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Nicolas Pitre <nicolas.pitre@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/1408528070.23412.89.camel@tkhai
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2014-08-20 14:53:02 +02:00

..

debug

kernel/printk: use symbolic defines for console loglevels

2014-06-04 16:54:17 -07:00

events

Merge tag 'v3.16-rc7' into perf/core, to merge in the latest fixes before applying new changes

2014-07-28 10:00:33 +02:00

gcov

gcov: add support for GCC 4.9

2014-06-10 15:34:46 -07:00

irq

genirq: Fix memory leak when calling irq_free_hwirqs()

2014-07-05 21:42:08 +02:00

locking

arch, locking: Ciao arch_mutex_cpu_relax()

2014-07-17 12:32:47 +02:00

power

Merge tag 'trace-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2014-08-04 11:50:00 -07:00

printk

kernel/printk/printk.c: revert "printk: enable interrupts before calling console_trylock_for_printk()"

2014-07-03 09:21:54 -07:00

rcu

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

2014-08-04 15:55:08 -07:00

sched

sched: Remove double_rq_lock() from __migrate_task()

2014-08-20 14:53:02 +02:00

time

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

2014-08-04 16:23:30 -07:00

trace

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

2014-08-04 16:09:53 -07:00

.gitignore

…

acct.c

ipc, kernel: clear whitespace

2014-06-06 16:08:14 -07:00

async.c

…

audit_tree.c

inotify: Fix reporting of cookies for inotify events

2014-02-18 11:17:17 +01:00

audit_watch.c

inotify: Fix reporting of cookies for inotify events

2014-02-18 11:17:17 +01:00

audit.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2014-06-12 14:27:40 -07:00

audit.h

audit: Use struct net not pid_t to remember the network namespce to reply in

2014-03-20 10:10:53 -04:00

auditfilter.c

Merge git://git.infradead.org/users/eparis/audit

2014-04-12 12:38:53 -07:00

auditsc.c

auditsc: audit_krule mask accesses need bounds checking

2014-06-10 08:44:40 -07:00

backtracetest.c

kernel/backtracetest.c: replace no level printk by pr_info()

2014-06-04 16:54:14 -07:00

bounds.c

…

capability.c

fs,userns: Change inode_capable to capable_wrt_inode_uidgid

2014-06-10 13:57:22 -07:00

cgroup_freezer.c

cgroup: rename cgroup_subsys->base_cftypes to ->legacy_cftypes

2014-07-15 11:05:09 -04:00

cgroup.c

Merge branch 'for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2014-08-04 10:11:28 -07:00

compat.c

kernel/compat.c: use sizeof() instead of sizeof

2014-06-04 16:54:19 -07:00

configs.c

…

context_tracking.c

x86/kprobes: Fix build errors and blacklist context_track_user

2014-06-14 09:07:44 +02:00

cpu_pm.c

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cpu.c

sched: Rework check_for_tasks()

2014-07-05 11:17:45 +02:00

cpuset.c

Merge branch 'for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2014-08-04 10:11:28 -07:00

crash_dump.c

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cred.c

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delayacct.c

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dma.c

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elfcore.c

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exec_domain.c

kernel/exec_domain.c: code clean-up

2014-06-04 16:54:15 -07:00

exit.c

signals: mv {dis,}allow_signal() from sched.h/exit.c to signal.[ch]

2014-06-06 16:08:11 -07:00

extable.c

asmlinkage: Make main_extable_sort_needed visible

2014-02-13 18:13:22 -08:00

fork.c

Merge tag 'v3.16-rc5' into sched/core, to refresh the branch before applying bigger tree-wide changes

2014-07-16 15:10:07 +02:00

freezer.c

…

futex_compat.c

compat: Get rid of (get|put)_compat_time(val|spec)

2014-02-02 14:09:12 -08:00

futex.c

futex: Simplify futex_lock_pi_atomic() and make it more robust

2014-06-21 22:26:24 +02:00

groups.c

kernel/groups.c: remove return value of set_groups

2014-04-03 16:21:05 -07:00

hrtimer.c

Merge branch 'perf/urgent' into perf/core, to resolve conflict and to prepare for new patches

2014-06-06 07:55:06 +02:00

hung_task.c

kernel/hung_task.c: convert simple_strtoul to kstrtouint

2014-06-04 16:54:15 -07:00

irq_work.c

irq_work: Remove BUG_ON in irq_work_run()

2014-07-05 11:17:26 +02:00

itimer.c

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jump_label.c

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kallsyms.c

kernel: use macros from compiler.h instead of __attribute__((...))

2014-04-07 16:36:11 -07:00

kcmp.c

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Kconfig.freezer

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Kconfig.hz

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Kconfig.locks

locking/rwsem: Add CONFIG_RWSEM_SPIN_ON_OWNER

2014-07-16 14:57:13 +02:00

Kconfig.preempt

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kexec.c

kexec: fix build error when hugetlbfs is disabled

2014-07-30 20:09:37 -07:00

kmod.c

signals: change wait_for_helper() to use kernel_sigaction()

2014-06-06 16:08:12 -07:00

kprobes.c

kprobes: Fix "Failed to find blacklist" probing errors on ia64 and ppc64

2014-07-18 06:23:40 +02:00

ksysfs.c

kobject: Make support for uevent_helper optional.

2014-04-25 12:00:49 -07:00

kthread.c

kthread_work: wake up worker only when the worker is idle

2014-07-28 14:07:52 -04:00

latencytop.c

kernel/latencytop.c: convert seq_printf to seq_puts

2014-06-04 16:54:15 -07:00

Makefile

Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-03-31 14:13:25 -07:00

module_signing.c

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module-internal.h

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module.c

crypto: fips - only panic on bad/missing crypto mod signatures

2014-07-03 21:38:32 +08:00

notifier.c

kprobes, notifier: Use NOKPROBE_SYMBOL macro in notifier

2014-04-24 10:26:39 +02:00

nsproxy.c

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padata.c

…

panic.c

kernel/panic.c: add "crash_kexec_post_notifiers" option for kdump after panic_notifers

2014-06-06 16:08:12 -07:00

params.c

param: hand arguments after -- straight to init

2014-04-28 11:48:34 +09:30

pid_namespace.c

pid_namespace: pidns_get() should check task_active_pid_ns() != NULL

2014-04-02 16:20:21 -07:00

pid.c

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posix-cpu-timers.c

…

posix-timers.c

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profile.c

kernel/profile.c: use static const char instead of static char

2014-06-06 16:08:13 -07:00

ptrace.c

sched: Remove proliferation of wait_on_bit() action functions

2014-07-16 15:10:39 +02:00

range.c

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reboot.c

kernel/reboot.c: convert simple_strtoul to kstrtoint

2014-06-04 16:54:15 -07:00

relay.c

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

2014-04-12 14:49:50 -07:00

res_counter.c

kernel/res_counter.c: replace simple_strtoull by kstrtoull

2014-06-04 16:54:15 -07:00

resource.c

resources: Clarify sanity check message

2014-05-23 10:47:21 -06:00

seccomp.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next

2014-06-12 14:27:40 -07:00

signal.c

signal: Explain local_irq_save() call

2014-07-09 09:14:33 -07:00

smp.c

Merge tag 'v3.16-rc5' into sched/core, to refresh the branch before applying bigger tree-wide changes

2014-07-16 15:10:07 +02:00

smpboot.c

…

smpboot.h

…

softirq.c

Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu

2014-05-22 11:36:10 +02:00

stacktrace.c

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stop_machine.c

kernel/stop_machine.c: kernel-doc warning fix

2014-06-04 16:54:15 -07:00

sys_ni.c

sys_sgetmask/sys_ssetmask: add CONFIG_SGETMASK_SYSCALL

2014-06-04 16:54:14 -07:00

sys.c

sched: Consolidate open coded implementations of nice level frobbing into nice_to_rlimit() and rlimit_to_nice()

2014-05-22 11:16:36 +02:00

sysctl_binary.c

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sysctl.c

kernel/watchdog.c: print traces for all cpus on lockup detection

2014-06-23 16:47:44 -07:00

system_certificates.S

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system_keyring.c

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task_work.c

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taskstats.c

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test_kprobes.c

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time.c

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timeconst.bc

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timer.c

timer: Prevent overflow in apply_slack

2014-04-30 13:46:17 +02:00

torture.c

torture: Avoid format string leak to thead name

2014-07-07 10:12:56 -07:00

tracepoint.c

tracing: syscall_regfunc() should not skip kernel threads

2014-06-21 00:15:26 -04:00

tsacct.c

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uid16.c

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up.c

smp: Rename __smp_call_function_single() to smp_call_function_single_async()

2014-02-24 14:47:15 -08:00

user_namespace.c

kernel/user_namespace.c: kernel-doc/checkpatch fixes

2014-06-06 16:08:13 -07:00

user-return-notifier.c

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user.c

kernel/user.c: drop unused field 'files' from user_struct

2014-06-04 16:54:16 -07:00

utsname_sysctl.c

sysctl: convert use of typedef ctl_table to struct ctl_table

2014-06-06 16:08:16 -07:00

utsname.c

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watchdog.c

kernel/watchdog.c: print traces for all cpus on lockup detection

2014-06-23 16:47:44 -07:00

workqueue_internal.h

workqueue: rename manager_mutex to attach_mutex

2014-05-20 10:59:32 -04:00

workqueue.c

Merge branch 'for-3.17' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2014-08-04 10:09:27 -07:00