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Ingo Molnar 7355690ead [PATCH] sched: fix SMT scheduler bug 
The SMT scheduler incorrectly skips kernel threads even if they are
runnable (but they are preempted by a higher-prio user-space task which got
SMT-delayed by an even higher-priority task running on a sibling CPU).

Fix this for now by only doing the SMT-nice optimization if the
to-be-delayed task is the only runnable task.  (This should cover most of
the real-life cases anyway.)

This bug has been in the SMT scheduler since 2.6.17 or so, but has only
been noticed now by the active check in the dynticks code.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-03-01 14:53:38 -08:00
..
irq
[PATCH] genirq: Mask irqs when migrating them.
2007-02-26 10:34:08 -08:00
power
power management: no valid states w/o pm_ops
2007-02-23 14:52:09 -08:00
time
[TICK] tick-common: Fix one-shot handling in tick_handle_periodic().
2007-02-26 11:14:15 -08:00
.gitignore
gitignore: ignore more generated files
2006-01-03 11:35:26 +01:00
acct.c
[PATCH] kernel: change uses of f_{dentry, vfsmnt} to use f_path
2006-12-08 08:28:42 -08:00
audit.c
[PATCH] audit config lockdown
2007-02-17 21:30:12 -05:00
audit.h
[PATCH] audit: AUDIT_PERM support
2006-09-11 13:32:30 -04:00
auditfilter.c
[PATCH] minor update to rule add/delete messages (ver 2)
2007-02-17 21:30:09 -05:00
auditsc.c
[PATCH] AUDIT_FD_PAIR
2007-02-17 21:30:15 -05:00
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
[PATCH] struct seq_operations and struct file_operations constification
2006-12-07 08:39:46 -08:00
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
[PATCH] slab: remove kmem_cache_t
2006-12-07 08:39:25 -08:00
dma.c
[PATCH] struct seq_operations and struct file_operations constification
2006-12-07 08:39:46 -08:00
exec_domain.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
exit.c
[PATCH] pid: replace is_orphaned_pgrp with is_current_pgrp_orphaned
2007-02-12 09:48:32 -08:00
extable.c
[PATCH] symbol_put_addr() locks kernel
2006-05-15 11:20:55 -07:00
fork.c
[PATCH] hrtimers: namespace and enum cleanup
2007-02-16 08:13:58 -08:00
futex_compat.c
[PATCH] __user annotations: futex
2006-10-10 15:37:22 -07:00
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
[PATCH] move kallsyms data to .rodata
2006-12-08 08:28:37 -08:00
Kconfig.hz
[PATCH] HZ: 300Hz support
2006-12-07 08:39:36 -08:00
Kconfig.preempt
…
kexec.c
Merge branch 'release' of master.kernel.org:/pub/scm/linux/kernel/git/aegl/linux-2.6
2006-12-07 15:39:22 -08:00
kfifo.c
[PATCH] Numerous fixes to kernel-doc info in source files.
2007-02-11 10:51:32 -08:00
kmod.c
Revert "Driver core: let request_module() send a /sys/modules/kmod/-uevent"
2007-02-23 14:54:57 -08:00
kprobes.c
[PATCH] kprobes: list all active probes in the system
2007-02-20 17:10:14 -08:00
ksysfs.c
Remove obsolete #include <linux/config.h>
2006-06-30 19:25:36 +02:00
kthread.c
[PATCH] Numerous fixes to kernel-doc info in source files.
2007-02-11 10:51:32 -08:00
latency.c
[PATCH] severing module.h->sched.h
2006-12-04 02:00:22 -05:00
lockdep_internals.h
[PATCH] lockdep: more chains
2006-12-07 08:39:43 -08:00
lockdep_proc.c
[PATCH] remove many unneeded #includes of sched.h
2007-02-14 08:09:54 -08:00
lockdep.c
[PATCH] fix section mismatch warning in lockdep
2007-03-01 14:53:37 -08:00
Makefile
[PATCH] sysctl: move utsname sysctls to their own file
2007-02-14 08:09:58 -08:00
module.c
Revert "Driver core: let request_module() send a /sys/modules/kmod/-uevent"
2007-02-23 14:54:57 -08:00
mutex-debug.c
[PATCH] remove many unneeded #includes of sched.h
2007-02-14 08:09:54 -08:00
mutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
mutex.c
[PATCH] lockdep: avoid lockdep warning in md
2006-12-08 08:28:39 -08:00
mutex.h
[PATCH] lockdep: prove mutex locking correctness
2006-07-03 15:27:04 -07:00
nsproxy.c
Revert "[PATCH] namespaces: fix exit race by splitting exit"
2007-01-30 13:35:18 -08:00
panic.c
[PATCH] Add TAINT_USER and ability to set taint flags from userspace
2007-02-11 10:51:29 -08:00
params.c
Revert "Driver core: let request_module() send a /sys/modules/kmod/-uevent"
2007-02-23 14:54:57 -08:00
pid.c
[PATCH] namespaces: fix task exit disaster
2007-01-30 13:40:36 -08:00
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
kernel/printk.c: comment fix
2007-02-17 20:10:16 +01:00
profile.c
[PATCH] proc: remove useless (and buggy) ->nlink settings
2007-02-11 10:51:32 -08:00
ptrace.c
[PATCH] pidspace: is_init()
2006-09-29 09:18:12 -07:00
rcupdate.c
[PATCH] rcu: add a prefetch() in rcu_do_batch()
2006-12-07 08:39:40 -08:00
rcutorture.c
[PATCH] rcu: rcutorture suspend fix
2006-12-30 10:55:55 -08:00
relay.c
[PATCH] kernel-doc fixes for 2.6.20-git15 (non-drivers)
2007-03-01 14:53:37 -08:00
resource.c
[PATCH] remove many unneeded #includes of sched.h
2007-02-14 08:09:54 -08:00
rtmutex_common.h
[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support
2006-06-27 17:32:47 -07:00
rtmutex-debug.c
Remove all inclusions of <linux/config.h>
2006-10-04 03:38:54 -04:00
rtmutex-debug.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rtmutex-tester.c
[PATCH] Add include/linux/freezer.h and move definitions from sched.h
2006-12-07 08:39:27 -08:00
rtmutex.c
[PATCH] hrtimers: namespace and enum cleanup
2007-02-16 08:13:58 -08:00
rtmutex.h
[PATCH] lockdep: better lock debugging
2006-07-03 15:27:01 -07:00
rwsem.c
[PATCH] lockdep: prove rwsem locking correctness
2006-07-03 15:27:04 -07:00
sched.c
[PATCH] sched: fix SMT scheduler bug
2007-03-01 14:53:38 -08:00
seccomp.c
…
signal.c
Merge master.kernel.org:/pub/scm/linux/kernel/git/kyle/parisc-2.6
2007-02-26 12:48:06 -08:00
softirq.c
[PATCH] tick-management: dyntick / highres functionality
2007-02-16 08:13:59 -08:00
softlockup.c
[PATCH] check return value of cpu_callback
2006-09-29 09:18:14 -07:00
spinlock.c
[PATCH] lockdep: spin_lock_irqsave_nested()
2006-11-25 13:28:34 -08:00
srcu.c
[PATCH] SRCU: report out-of-memory errors
2006-10-04 07:55:30 -07:00
stacktrace.c
[PATCH] lockdep: stacktrace subsystem, core
2006-07-03 15:27:02 -07:00
stop_machine.c
[PATCH] stop_machine.c copyright
2006-09-29 09:18:24 -07:00
sys_ni.c
[PATCH] Create compat_sys_migrate_pages
2006-11-03 12:27:59 -08:00
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] fix the SYSCTL=n compilation
2007-03-01 14:53:37 -08:00
taskstats.c
[PATCH] taskstats: cleanup reply assembling
2006-12-07 08:39:34 -08:00
time.c
[PATCH] Fix multiple conversion bugs in msecs_to_jiffies
2007-02-16 08:13:56 -08:00
timer.c
[PATCH] kernel-doc fixes for 2.6.20-git15 (non-drivers)
2007-03-01 14:53:37 -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
[PATCH] Add more prevent_tail_call()
2006-04-19 16:27:18 -07:00
user.c
[PATCH] slab: remove kmem_cache_t
2006-12-07 08:39:25 -08:00
utsname_sysctl.c
[PATCH] sysctl: remove insert_at_head from register_sysctl
2007-02-14 08:09:59 -08:00
utsname.c
[PATCH] namespaces: utsname: implement CLONE_NEWUTS flag
2006-10-02 07:57:22 -07:00
wait.c
[PATCH] uninline init_waitqueue_head()
2006-07-10 13:24:25 -07:00
workqueue.c
[PATCH] Add debugging feature /proc/timer_stat
2007-02-16 08:13:59 -08:00