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Alex Williamson 486d46aefe [PATCH] optimize writer path in time_interpolator_get_counter() 
Christoph Lameter <clameter@engr.sgi.com>

When using a time interpolator that is susceptible to jitter there's
potentially contention over a cmpxchg used to prevent time from going
backwards.  This is unnecessary when the caller holds the xtime write
seqlock as all readers will be blocked from returning until the write is
complete.  We can therefore allow writers to insert a new value and exit
rather than fight with CPUs who only hold a reader lock.

Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
 		2005-09-07 16:57:24 -07:00
..
irq [PATCH] x86/x86_64: deferred handling of writes to /proc/irqxx/smp_affinity 2005-09-07 16:57:15 -07:00
power [PATCH] detect soft lockups 2005-09-07 16:57:17 -07:00
Kconfig.hz [PATCH] i386: Selectable Frequency of the Timer Interrupt 2005-06-23 09:45:10 -07:00
Kconfig.preempt [PATCH] sched: voluntary kernel preemption 2005-06-25 16:24:45 -07:00
Makefile [PATCH] detect soft lockups 2005-09-07 16:57:17 -07:00
acct.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
audit.c [NETLINK]: Add "groups" argument to netlink_kernel_create 2005-08-29 16:01:11 -07:00
auditsc.c AUDIT: Record working directory when syscall arguments are pathnames 2005-05-27 12:17:28 +01:00
capability.c [PATCH] kernel/capability.c: add kerneldoc 2005-07-27 16:26:06 -07:00
compat.c [PATCH] Fix get_compat_sigevent() 2005-04-16 15:24:01 -07:00
configs.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
cpu.c [PATCH] i386 CPU hotplug 2005-06-25 16:24:29 -07:00
cpuset.c [PATCH] completely disable cpu_exclusive sched domain 2005-08-26 16:38:47 -07:00
crash_dump.c [PATCH] kernel/crash_dump.c: add kerneldoc 2005-07-27 16:26:06 -07:00
dma.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exec_domain.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
exit.c [PATCH] revert "timer exit cleanup" 2005-08-04 16:57:49 -07:00
extable.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
fork.c [PATCH] UML Support - Ptrace: adds the host SYSEMU support, for UML and general usage 2005-09-05 00:06:20 -07:00
futex.c [PATCH] FUTEX_WAKE_OP: pthread_cond_signal() speedup 2005-09-07 16:57:17 -07:00
intermodule.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
itimer.c [PATCH] itimer fixes 2005-07-27 16:25:51 -07:00
kallsyms.c [PATCH] ppc32: platform-specific functions missing from kallsyms. 2005-05-05 16:36:31 -07:00
kexec.c [PATCH] kexec: fix sparse warnings 2005-06-28 14:53:40 -07:00
kfifo.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
kmod.c [PATCH] Keys: Pass session keyring to call_usermodehelper() 2005-06-24 00:05:18 -07:00
kprobes.c [PATCH] kprobes: fix namespace problem and sparc64 build 2005-07-05 19:19:00 -07:00
ksysfs.c [PATCH] Kdump: Export crash notes section address through sysfs 2005-06-25 16:24:51 -07:00
kthread.c [PATCH] use smp_mb/wmb/rmb where possible 2005-05-01 08:58:47 -07:00
module.c [PATCH] Module per-cpu alignment cannot always be met 2005-08-01 21:38:01 -07:00
panic.c [PATCH] Call emergency_reboot from panic 2005-07-26 14:35:43 -07:00
params.c [PATCH] sysfs: (rest) if show/store is missing return -EIO 2005-06-20 15:15:03 -07:00
pid.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
posix-cpu-timers.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
posix-timers.c [PATCH] revert "timer exit cleanup" 2005-08-04 16:57:49 -07:00
printk.c [PATCH] Provide better printk() support for SMP machines 2005-09-07 16:57:18 -07:00
profile.c [PATCH] mostly_read data section 2005-07-07 18:23:46 -07:00
ptrace.c [PATCH] convert that currently tests _NSIG directly to use valid_signal() 2005-05-01 08:59:14 -07:00
rcupdate.c [PATCH] Deprecate synchronize_kernel, GPL replacement 2005-05-01 08:59:04 -07:00
resource.c [PATCH] Use ALIGN to remove duplicate code 2005-06-25 16:25:02 -07:00
sched.c [PATCH] Make RLIMIT_NICE ranges consistent with getpriority(2) 2005-08-18 12:53:58 -07:00
seccomp.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
signal.c [PATCH] NPTL signal delivery deadlock fix 2005-08-17 12:52:04 -07:00
softirq.c [PATCH] revert bogus softirq changes 2005-07-30 10:49:59 -07:00
softlockup.c [PATCH] detect soft lockups 2005-09-07 16:57:17 -07:00
spinlock.c [PATCH] spin_unlock_bh() and preempt_check_resched() 2005-05-21 10:46:48 -07:00
stop_machine.c [PATCH] smp_processor_id() cleanup 2005-06-21 18:46:13 -07:00
sys.c [PATCH] Remove suspend() calls from shutdown path 2005-08-04 08:20:47 -07:00
sys_ni.c [PATCH] remove sys_set_zone_reclaim() 2005-08-01 10:03:56 -07:00
sysctl.c [NET]: Fix sparse warnings 2005-08-29 16:01:32 -07:00
time.c [PATCH] clean up inline static vs static inline 2005-07-27 16:26:20 -07:00
timer.c [PATCH] optimize writer path in time_interpolator_get_counter() 2005-09-07 16:57:24 -07:00
uid16.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
user.c [PATCH] inotify 2005-07-12 20:38:38 -07:00
wait.c Linux-2.6.12-rc2 2005-04-16 15:20:36 -07:00
workqueue.c [PATCH] remove name length check in a workqueue 2005-08-10 11:55:19 -07:00