Paul E. McKenney 1f2ea0837d [PATCH] posix timers: RCU optimization for clock_gettime() ...

Use RCU to avoid the need to acquire tasklist_lock in the single-threaded
case of clock_gettime().  It still acquires tasklist_lock when for a
(potentially multithreaded) process.  This change allows realtime
applications to frequently monitor CPU consumption of individual tasks, as
requested (and now deployed) by some off-list users.

This has been in Ingo Molnar's -rt patchset since late 2005 with no
problems reported, and tests successfully on 2.6.20-rc6, so I believe that
it is long-since ready for mainline adoption.

[[email protected]: fix exit()/posix_cpu_clock_get() race spotted by Oleg]
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: john stultz <[email protected]>
Cc: Roman Zippel <[email protected]>
Cc: Oleg Nesterov <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

2007-02-16 08:14:00 -08:00

..

irq

[PATCH] Add a function to handle interrupt affinity setting

2007-02-16 08:13:56 -08:00

power

[PATCH] swsusp: Change pm_ops handling by userland interface

2007-02-11 10:51:20 -08:00

time

[PATCH] Add debugging feature /proc/timer_list

2007-02-16 08:13:59 -08:00

.gitignore

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acct.c

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audit.c

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audit.h

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auditfilter.c

[PATCH] audit: fix audit_filter_user_rules() initialization bug

2007-02-11 10:51:34 -08:00

auditsc.c

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capability.c

[PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task

2007-02-12 09:48:32 -08:00

compat.c

[PATCH] Common compat_sys_sysinfo

2007-02-11 10:51:32 -08:00

configs.c

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cpu.c

[PATCH] swsusp: Change code ordering in disk.c

2007-02-11 10:51:19 -08:00

cpuset.c

[PATCH] mark struct inode_operations const 2

2007-02-12 09:48:46 -08:00

delayacct.c

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dma.c

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exec_domain.c

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exit.c

[PATCH] pid: replace is_orphaned_pgrp with is_current_pgrp_orphaned

2007-02-12 09:48:32 -08:00

extable.c

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fork.c

[PATCH] hrtimers: namespace and enum cleanup

2007-02-16 08:13:58 -08:00

futex_compat.c

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futex.c

[PATCH] hrtimers: namespace and enum cleanup

2007-02-16 08:13:58 -08:00

hrtimer.c

[PATCH] Add debugging feature /proc/timer_stat

2007-02-16 08:13:59 -08:00

itimer.c

[PATCH] hrtimers: prevent possible itimer DoS

2007-02-16 08:13:59 -08:00

kallsyms.c

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Kconfig.hz

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Kconfig.preempt

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kexec.c

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kfifo.c

[PATCH] Numerous fixes to kernel-doc info in source files.

2007-02-11 10:51:32 -08:00

kmod.c

[PATCH] x86-64: Allow to run a program when a machine check event is detected

2007-02-13 13:26:23 +01:00

kprobes.c

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ksysfs.c

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kthread.c

[PATCH] Numerous fixes to kernel-doc info in source files.

2007-02-11 10:51:32 -08:00

latency.c

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lockdep_internals.h

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lockdep_proc.c

[PATCH] remove many unneeded #includes of sched.h

2007-02-14 08:09:54 -08:00

lockdep.c

[PATCH] lockdep: add graph depth information to /proc/lockdep

2007-02-11 10:51:26 -08:00

Makefile

[PATCH] sysctl: move utsname sysctls to their own file

2007-02-14 08:09:58 -08:00

module.c

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mutex-debug.c

[PATCH] remove many unneeded #includes of sched.h

2007-02-14 08:09:54 -08:00

mutex-debug.h

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mutex.c

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mutex.h

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nsproxy.c

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panic.c

[PATCH] Add TAINT_USER and ability to set taint flags from userspace

2007-02-11 10:51:29 -08:00

params.c

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pid.c

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posix-cpu-timers.c

[PATCH] posix timers: RCU optimization for clock_gettime()

2007-02-16 08:14:00 -08:00

posix-timers.c

[PATCH] hrtimers: add high resolution timer support

2007-02-16 08:13:59 -08:00

printk.c

[PATCH] order of lockdep off/on in vprintk() should be changed

2007-02-11 11:18:06 -08:00

profile.c

[PATCH] proc: remove useless (and buggy) ->nlink settings

2007-02-11 10:51:32 -08:00

ptrace.c

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rcupdate.c

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rcutorture.c

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relay.c

[PATCH] Numerous fixes to kernel-doc info in source files.

2007-02-11 10:51:32 -08:00

resource.c

[PATCH] remove many unneeded #includes of sched.h

2007-02-14 08:09:54 -08:00

rtmutex_common.h

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rtmutex-debug.c

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rtmutex-debug.h

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rtmutex-tester.c

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rtmutex.c

[PATCH] hrtimers: namespace and enum cleanup

2007-02-16 08:13:58 -08:00

rtmutex.h

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rwsem.c

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sched.c

[PATCH] i386: paravirt CPU hypercall batching mode

2007-02-13 13:26:21 +01:00

seccomp.c

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signal.c

[PATCH] hrtimers: prevent possible itimer DoS

2007-02-16 08:13:59 -08:00

softirq.c

[PATCH] tick-management: dyntick / highres functionality

2007-02-16 08:13:59 -08:00

softlockup.c

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spinlock.c

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srcu.c

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stacktrace.c

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stop_machine.c

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sys_ni.c

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sys.c

[PATCH] pid: replace do/while_each_task_pid with do/while_each_pid_task

2007-02-12 09:48:32 -08:00

sysctl.c

[PATCH] sysctl: add a parent entry to ctl_table and set the parent entry

2007-02-14 08:10:00 -08:00

taskstats.c

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time.c

[PATCH] Fix multiple conversion bugs in msecs_to_jiffies

2007-02-16 08:13:56 -08:00

timer.c

[PATCH] generic: vsyscall-gtod support for GENERIC_TIME

2007-02-16 08:14:00 -08:00

tsacct.c

[PATCH] time: x86_64: split x86_64/kernel/time.c up

2007-02-16 08:14:00 -08:00

uid16.c

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user.c

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utsname_sysctl.c

[PATCH] sysctl: remove insert_at_head from register_sysctl

2007-02-14 08:09:59 -08:00

utsname.c

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wait.c

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workqueue.c

[PATCH] Add debugging feature /proc/timer_stat

2007-02-16 08:13:59 -08:00