Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Chen, Kenneth W c96d145e71 [PATCH] sched: fix smt nice lock contention and optimization ... Initial report and lock contention fix from Chris Mason: Recent benchmarks showed some performance regressions between 2.6.16 and 2.6.5. We tracked down one of the regressions to lock contention in schedule heavy workloads (~70,000 context switches per second) kernel/sched.c:dependent_sleeper() was responsible for most of the lock contention, hammering on the run queue locks. The patch below is more of a discussion point than a suggested fix (although it does reduce lock contention significantly). The dependent_sleeper code looks very expensive to me, especially for using a spinlock to bounce control between two different siblings in the same cpu. It is further optimized: * perform dependent_sleeper check after next task is determined * convert wake_sleeping_dependent to use trylock * skip smt runqueue check if trylock fails * optimize double_rq_lock now that smt nice is converted to trylock * early exit in searching first SD_SHARE_CPUPOWER domain * speedup fast path of dependent_sleeper [akpm@osdl.org: cleanup] Signed-off-by: Ken Chen <kenneth.w.chen@intel.com> Acked-by: Ingo Molnar <mingo@elte.hu> Acked-by: Con Kolivas <kernel@kolivas.org> Signed-off-by: Nick Piggin <npiggin@suse.de> Acked-by: Chris Mason <mason@suse.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>		2006-06-27 17:32:44 -07:00
..
irq	[PATCH] adjust handle_IRR_event() return type	2006-06-23 07:43:08 -07:00
power	[PATCH] pm_trace is dangerous	2006-06-27 17:32:35 -07:00
time	[PATCH] time: rename clocksource functions	2006-06-26 09:58:21 -07:00
.gitignore
acct.c	[PATCH] fix kernel-doc in kernel/ dir	2006-06-27 17:32:39 -07:00
audit.c	[PATCH] spin/rwlock init cleanups	2006-06-27 17:32:39 -07:00
audit.h	[PATCH] log more info for directory entry change events	2006-06-20 05:25:28 -04:00
auditfilter.c	[PATCH] log more info for directory entry change events	2006-06-20 05:25:28 -04:00
auditsc.c	[PATCH] fix kernel-doc in kernel/ dir	2006-06-27 17:32:39 -07:00
capability.c
compat.c	[PATCH] N32 sigset and __COMPAT_ENDIAN_SWAP__	2006-06-25 10:01:15 -07:00
configs.c
cpu.c	[PATCH] cpu hotplug: make [un]register_cpu_notifier init time only	2006-06-27 17:32:41 -07:00
cpuset.c	[PATCH] proc: Use struct pid not struct task_ref	2006-06-26 09:58:26 -07:00
dma.c
exec_domain.c
exit.c	[PATCH] proc: Rewrite the proc dentry flush on exit optimization	2006-06-26 09:58:24 -07:00
extable.c
fork.c	[PATCH] coredump: copy_process: don't check SIGNAL_GROUP_EXIT	2006-06-26 09:58:27 -07:00
futex.c	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
futex_compat.c
hrtimer.c	[PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17	2006-06-27 17:32:41 -07:00
itimer.c
kallsyms.c
Kconfig.hz
Kconfig.preempt
kexec.c	[PATCH] Add a sysfs file to determine if a kexec kernel is loaded	2006-06-23 07:43:02 -07:00
kfifo.c
kmod.c
kprobes.c	[PATCH] Notify page fault call chain	2006-06-26 09:58:22 -07:00
ksysfs.c	[PATCH] Add a sysfs file to determine if a kexec kernel is loaded	2006-06-23 07:43:02 -07:00
kthread.c	[PATCH] kthread: move kernel-doc and put it into DocBook	2006-06-25 10:01:24 -07:00
Makefile	Merge branch 'x86-64'	2006-06-26 10:51:09 -07:00
module.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild	2006-06-26 11:05:15 -07:00
mutex-debug.c	[PATCH] poison: add & use more constants	2006-06-27 17:32:38 -07:00
mutex-debug.h	[PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs	2006-06-26 09:58:16 -07:00
mutex.c	[PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs	2006-06-26 09:58:16 -07:00
mutex.h	[PATCH] work around ppc64 bootup bug by making mutex-debugging save/restore irqs	2006-06-26 09:58:16 -07:00
panic.c
params.c
pid.c
posix-cpu-timers.c
posix-timers.c
printk.c	[PATCH] printk time parameter	2006-06-25 10:01:13 -07:00
profile.c	[PATCH] cpu hotplug: revert init patch submitted for 2.6.17	2006-06-27 17:32:40 -07:00
ptrace.c	[PATCH] coredump: kill ptrace related stuff	2006-06-26 09:58:27 -07:00
rcupdate.c	[PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17	2006-06-27 17:32:41 -07:00
rcutorture.c	[PATCH] rcutorture: add call_rcu_bh() operations	2006-06-27 17:32:40 -07:00
relay.c
resource.c	[PATCH] catch valid mem range at onlining memory	2006-06-27 17:32:36 -07:00
sched.c	[PATCH] sched: fix smt nice lock contention and optimization	2006-06-27 17:32:44 -07:00
seccomp.c
signal.c	[PATCH] coredump: kill ptrace related stuff	2006-06-26 09:58:27 -07:00
softirq.c	[PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17	2006-06-27 17:32:41 -07:00
softlockup.c	[PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17	2006-06-27 17:32:41 -07:00
spinlock.c
stop_machine.c	[PATCH] kthread: convert stop_machine into a kthread	2006-06-25 10:01:22 -07:00
sys.c	[PATCH] kernel/sys.c: cleanups	2006-06-25 10:01:06 -07:00
sys_ni.c	[PATCH] sys_move_pages: 32bit support (i386, x86_64)	2006-06-23 07:42:53 -07:00
sysctl.c	[PATCH] vdso: randomize the i386 vDSO by moving it into a vma	2006-06-27 17:32:38 -07:00
time.c	[PATCH] Time: Introduce arch generic time accessors	2006-06-26 09:58:20 -07:00
timer.c	[PATCH] cpu hotplug: revert initdata patch submitted for 2.6.17	2006-06-27 17:32:41 -07:00
uid16.c
unwind.c	[PATCH] x86_64: allow unwinder to build without module support	2006-06-26 10:48:18 -07:00
user.c	[PATCH] selinux: add hooks for key subsystem	2006-06-22 15:05:55 -07:00
wait.c
workqueue.c	[PATCH] cpu hotplug: revert init patch submitted for 2.6.17	2006-06-27 17:32:40 -07:00