Rik van Riel 68d1b02a58 sched/numa: Do not set preferred_node on migration to a second choice node ... Setting the numa_preferred_node for a task in task_numa_migrate does nothing on a 2-node system. Either we migrate to the node that already was our preferred node, or we stay where we were. On a 4-node system, it can slightly decrease overhead, by not calling the NUMA code as much. Since every node tends to be directly connected to every other node, running on the wrong node for a while does not do much damage. However, on an 8 node system, there are far more bad nodes than there are good ones, and pretending that a second choice is actually the preferred node can greatly delay, or even prevent, a workload from converging. The only time we can safely pretend that a second choice node is the preferred node is when the task is part of a workload that spans multiple NUMA nodes. Signed-off-by: Rik van Riel <riel@redhat.com> Tested-by: Vinod Chegu <chegu_vinod@hp.com> Acked-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/1397235629-16328-4-git-send-email-riel@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2014-05-07 13:33:47 +02:00
..
debug	mm: per-thread vma caching	2014-04-07 16:35:53 -07:00
events	Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm	2014-04-05 13:20:43 -07:00
gcov	gcov: reuse kbasename helper	2013-11-13 12:09:34 +09:00
irq	genirq: Export symbol no_action()	2014-03-22 11:33:09 +01:00
locking	Merge branch 'sched/urgent' into sched/core, to avoid conflicts	2014-05-07 13:15:46 +02:00
power	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
printk	printk: fix one circular lockdep warning about console_lock	2014-04-03 16:21:08 -07:00
rcu	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 11:21:19 -07:00
sched	sched/numa: Do not set preferred_node on migration to a second choice node	2014-05-07 13:33:47 +02:00
time	tick-sched: Check tick_nohz_enabled in tick_nohz_switch_to_nohz()	2014-04-15 20:26:58 +02:00
trace	This contains two fixes.	2014-04-18 10:16:43 -07:00
.gitignore	Ignore generated file kernel/x509_certificate_list	2013-12-10 18:21:34 +00:00
acct.c
async.c
audit_tree.c	inotify: Fix reporting of cookies for inotify events	2014-02-18 11:17:17 +01:00
audit_watch.c	inotify: Fix reporting of cookies for inotify events	2014-02-18 11:17:17 +01:00
audit.c	Merge git://git.infradead.org/users/eparis/audit	2014-04-12 12:38:53 -07:00
audit.h	audit: Use struct net not pid_t to remember the network namespce to reply in	2014-03-20 10:10:53 -04:00
auditfilter.c	Merge git://git.infradead.org/users/eparis/audit	2014-04-12 12:38:53 -07:00
auditsc.c	Merge git://git.infradead.org/users/eparis/audit	2014-04-12 12:38:53 -07:00
backtracetest.c
bounds.c	mm: do not allocate page->ptl dynamically, if spinlock_t fits to long	2013-12-20 12:25:45 -08:00
capability.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2014-04-03 09:26:18 -07:00
cgroup_freezer.c	cgroup: drop const from @buffer of cftype->write_string()	2014-03-19 10:23:54 -04:00
cgroup.c	cgroup: newly created dirs and files should be owned by the creator	2014-04-07 16:44:47 -04:00
compat.c	Merge branch 'x86-x32-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-04-02 12:51:41 -07:00
configs.c
context_tracking.c	context_tracking: Wrap static key check into more intuitive function name	2013-12-02 20:43:14 +01:00
cpu_pm.c
cpu.c	CPU hotplug: Provide lockless versions of callback registration functions	2014-03-20 13:43:40 +01:00
cpuset.c	Merge branch 'akpm' (incoming from Andrew)	2014-04-03 16:22:16 -07:00
crash_dump.c
cred.c
delayacct.c	kernel/delayacct.c: remove redundant checking in __delayacct_add_tsk()	2013-11-13 12:09:12 +09:00
dma.c
elfcore.c
exec_domain.c
exit.c	wait: WSTOPPED|WCONTINUED doesn't work if a zombie leader is traced by another process	2014-04-07 16:36:06 -07:00
extable.c	asmlinkage: Make main_extable_sort_needed visible	2014-02-13 18:13:22 -08:00
fork.c	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
freezer.c	libata, freezer: avoid block device removal while system is frozen	2013-12-19 13:50:32 -05:00
futex_compat.c	compat: Get rid of (get|put)_compat_time(val|spec)	2014-02-02 14:09:12 -08:00
futex.c	futex: update documentation for ordering guarantees	2014-04-12 17:57:51 -07:00
groups.c	kernel/groups.c: remove return value of set_groups	2014-04-03 16:21:05 -07:00
hrtimer.c	timer: Remove code redundancy while calling get_nohz_timer_target()	2014-03-20 12:35:46 +01:00
hung_task.c	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
irq_work.c	perf/x86: Warn to early_printk() in case irq_work is too slow	2014-02-21 21:49:07 +01:00
itimer.c
jump_label.c
kallsyms.c	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz	kernel: remove CONFIG_USE_GENERIC_SMP_HELPERS	2013-11-15 09:32:22 +09:00
Kconfig.locks
Kconfig.preempt
kexec.c	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
kmod.c	execve: use 'struct filename *' for executable name passing	2014-02-05 12:54:53 -08:00
kprobes.c	kprobes: use KSYM_NAME_LEN to size identifier buffers	2013-11-13 12:09:26 +09:00
ksysfs.c	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
kthread.c	kthread: ensure locality of task_struct allocations	2014-04-03 16:20:49 -07:00
latencytop.c
Makefile	Merge branch 'x86-asmlinkage-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-03-31 14:13:25 -07:00
module_signing.c
module-internal.h
module.c	modules: use raw_cpu_write for initialization of per cpu refcount.	2014-04-07 16:36:14 -07:00
notifier.c	notifier: Substitute rcu_access_pointer() for rcu_dereference_raw()	2014-02-26 06:35:13 -08:00
nsproxy.c
padata.c	padata: Fix wrong usage of rcu_dereference()	2013-12-05 21:28:42 +08:00
panic.c	kernel/panic.c: display reason at end + pr_emerg	2014-04-07 16:36:08 -07:00
params.c	params: improve standard definitions	2013-12-04 14:09:46 +10:30
pid_namespace.c	pid_namespace: pidns_get() should check task_active_pid_ns() != NULL	2014-04-02 16:20:21 -07:00
pid.c
posix-cpu-timers.c	posix-timers: Convert abuses of BUG_ON to WARN_ON	2013-12-09 16:56:29 +01:00
posix-timers.c
profile.c	CPU hotplug notifiers registration fixes for 3.15-rc1	2014-04-07 14:55:46 -07:00
ptrace.c	kernel/compat: convert to COMPAT_SYSCALL_DEFINE	2014-03-06 15:35:10 +01:00
range.c
reboot.c	kexec: migrate to reboot cpu	2013-12-18 19:04:50 -08:00
relay.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-04-12 14:49:50 -07:00
res_counter.c	res_counter: remove interface for locked charging and uncharging	2014-04-07 16:35:54 -07:00
resource.c	kernel/resource.c: make reallocate_resource() static	2014-04-03 16:21:07 -07:00
seccomp.c	seccomp: fix memory leak on filter attach	2014-04-16 15:25:53 -04:00
signal.c	kernel: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:36:11 -07:00
smp.c	smp: Rename __smp_call_function_single() to smp_call_function_single_async()	2014-02-24 14:47:15 -08:00
smpboot.c
smpboot.h
softirq.c	softirq: Add linux/irq.h to make it compile again	2014-03-19 11:28:14 +01:00
stacktrace.c
stop_machine.c	stop_machine: Fix^2 race between stop_two_cpus() and stop_cpus()	2014-03-11 11:33:47 +01:00
sys_ni.c	fs, kernel: permit disabling the uselib syscall	2014-04-03 16:21:05 -07:00
sys.c	mm, thp: add VM_INIT_DEF_MASK and PRCTL_THP_DISABLE	2014-04-07 16:35:52 -07:00
sysctl_binary.c	kernel/sysctl_binary.c: use scnprintf() instead of snprintf()	2013-11-13 12:09:33 +09:00
sysctl.c	hung_task: check the value of "sysctl_hung_task_timeout_sec"	2014-04-07 16:36:07 -07:00
system_certificates.S	KEYS: correct alignment of system_certificate_list content in assembly file	2013-12-10 18:25:28 +00:00
system_keyring.c	KEYS: correct alignment of system_certificate_list content in assembly file	2013-12-10 18:25:28 +00:00
task_work.c
taskstats.c	genetlink: only pass array to genl_register_family_with_ops()	2013-11-19 16:39:05 -05:00
test_kprobes.c
time.c
timeconst.bc
timer.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-04-01 11:00:07 -07:00
torture.c	rcutorture: Gracefully handle NULL cleanup hooks	2014-02-23 09:04:39 -08:00
tracepoint.c	This includes the final patch to clean up and fix the issue with the	2014-04-12 13:06:10 -07:00
tsacct.c
uid16.c
up.c	smp: Rename __smp_call_function_single() to smp_call_function_single_async()	2014-02-24 14:47:15 -08:00
user_namespace.c	user namespace: fix incorrect memory barriers	2014-04-14 16:03:02 -07:00
user-return-notifier.c
user.c	kernel: audit/fix non-modular users of module_init in core code	2014-04-03 16:21:07 -07:00
utsname_sysctl.c
utsname.c
watchdog.c	kernel/watchdog.c:touch_softlockup_watchdog(): use raw_cpu_write()	2014-04-18 16:40:08 -07:00
workqueue_internal.h
workqueue.c	sched, treewide: Replace hardcoded nice values with MIN_NICE/MAX_NICE	2014-04-18 12:07:24 +02:00