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 <[email protected]>
Cc: Michal Piotrowski <[email protected]>
Cc: Nick Piggin <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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

…

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

…

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

…

dma.c

[PATCH] struct seq_operations and struct file_operations constification

2006-12-07 08:39:46 -08:00

exec_domain.c

…

exit.c

[PATCH] pid: replace is_orphaned_pgrp with is_current_pgrp_orphaned

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

extable.c

…

fork.c

[PATCH] hrtimers: namespace and enum cleanup

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

futex_compat.c

…

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

…

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

…

kthread.c

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

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

latency.c

…

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

…

mutex.c

[PATCH] lockdep: avoid lockdep warning in md

2006-12-08 08:28:39 -08:00

mutex.h

…

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

…

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

…

rtmutex-debug.c

…

rtmutex-debug.h

…

rtmutex-tester.c

…

rtmutex.c

[PATCH] hrtimers: namespace and enum cleanup

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

rtmutex.h

…

rwsem.c

…

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

…

spinlock.c

…

srcu.c

…

stacktrace.c

…

stop_machine.c

…

sys_ni.c

…

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

…

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

…

user.c

…

utsname_sysctl.c

[PATCH] sysctl: remove insert_at_head from register_sysctl

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

utsname.c

…

wait.c

…

workqueue.c

[PATCH] Add debugging feature /proc/timer_stat

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