Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Mike Galbraith 5091faa449 sched: Add 'autogroup' scheduling feature: automated per session task groups ... A recurring complaint from CFS users is that parallel kbuild has a negative impact on desktop interactivity. This patch implements an idea from Linus, to automatically create task groups. Currently, only per session autogroups are implemented, but the patch leaves the way open for enhancement. Implementation: each task's signal struct contains an inherited pointer to a refcounted autogroup struct containing a task group pointer, the default for all tasks pointing to the init_task_group. When a task calls setsid(), a new task group is created, the process is moved into the new task group, and a reference to the preveious task group is dropped. Child processes inherit this task group thereafter, and increase it's refcount. When the last thread of a process exits, the process's reference is dropped, such that when the last process referencing an autogroup exits, the autogroup is destroyed. At runqueue selection time, IFF a task has no cgroup assignment, its current autogroup is used. Autogroup bandwidth is controllable via setting it's nice level through the proc filesystem: cat /proc/<pid>/autogroup Displays the task's group and the group's nice level. echo <nice level> > /proc/<pid>/autogroup Sets the task group's shares to the weight of nice <level> task. Setting nice level is rate limited for !admin users due to the abuse risk of task group locking. The feature is enabled from boot by default if CONFIG_SCHED_AUTOGROUP=y is selected, but can be disabled via the boot option noautogroup, and can also be turned on/off on the fly via: echo [01] > /proc/sys/kernel/sched_autogroup_enabled ... which will automatically move tasks to/from the root task group. Signed-off-by: Mike Galbraith <efault@gmx.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Markus Trippelsdorf <markus@trippelsdorf.de> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Paul Turner <pjt@google.com> Cc: Oleg Nesterov <oleg@redhat.com> [ Removed the task_group_path() debug code, and fixed !EVENTFD build failure. ] Signed-off-by: Ingo Molnar <mingo@elte.hu> LKML-Reference: <1290281700.28711.9.camel@maggy.simson.net> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2010-11-30 16:03:35 +01:00
..
debug	kdb: fix crash when KDB_BASE_CMD_MAX is exceeded	2010-11-17 13:54:57 -06:00
gcov	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
irq	Merge commit 'v2.6.37-rc2' into sched/core	2010-11-18 13:22:26 +01:00
power	PM / OPP: Hide OPP configuration when SoCs do not provide an implementation	2010-11-11 01:51:26 +01:00
time	ntp: Clamp PLL update interval	2010-09-09 20:48:37 +02:00
trace	Merge commit 'v2.6.37-rc3' into sched/core	2010-11-26 15:05:21 +01:00
.gitignore
acct.c	pass a struct path to vfs_statfs	2010-08-09 16:48:42 -04:00
async.c	async: use workqueue for worker pool	2010-07-14 11:29:46 +02:00
audit.c	audit: Use rcu for task lookup protection	2010-10-30 08:45:42 -04:00
audit.h	audit: make functions static	2010-10-30 01:42:19 -04:00
audit_tree.c	in untag_chunk() we need to do alloc_chunk() a bit earlier	2010-10-30 02:18:32 -04:00
audit_watch.c	audit: make functions static	2010-10-30 01:42:19 -04:00
auditfilter.c	Audit: add support to match lsm labels on user audit messages	2010-10-30 01:41:57 -04:00
auditsc.c	audit mmap	2010-10-30 08:45:43 -04:00
backtracetest.c
bounds.c
capability.c
cgroup.c	convert cgroup and cpuset	2010-10-29 04:17:06 -04:00
cgroup_freezer.c	cgroup_freezer: update_freezer_state() does incorrect state transitions	2010-10-27 18:03:08 -07:00
compat.c	compat: Make compat_alloc_user_space() incorporate the access_ok()	2010-09-14 16:08:45 -07:00
configs.c	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
cpu.c	cpu: Remove incorrect BUG_ON	2010-11-23 10:29:08 +01:00
cpuset.c	convert cgroup and cpuset	2010-10-29 04:17:06 -04:00
cred.c	signals: move cred_guard_mutex from task_struct to signal_struct	2010-10-27 18:03:12 -07:00
delayacct.c
dma.c
elfcore.c
exec_domain.c	sys_personality: remove the bogus checks in sys_personality()->__set_personality() path	2010-08-09 20:45:05 -07:00
exit.c	posix-cpu-timers: workaround to suppress the problems with mt exec	2010-11-05 14:16:03 -07:00
extable.c
fork.c	sched: Add 'autogroup' scheduling feature: automated per session task groups	2010-11-30 16:03:35 +01:00
freezer.c
futex.c	futex: Address compiler warnings in exit_robust_list	2010-11-10 13:27:50 +01:00
futex_compat.c	futex: Address compiler warnings in exit_robust_list	2010-11-10 13:27:50 +01:00
groups.c	kernel/groups.c: fix integer overflow in groups_search	2010-09-09 18:57:24 -07:00
hrtimer.c	hrtimer: Preserve timer state in remove_hrtimer()	2010-10-14 13:29:59 +02:00
hung_task.c	lockup detector: Fix grammar by adding a missing "to" in the comments	2010-08-17 09:11:52 +02:00
hw_breakpoint.c	perf, hw_breakpoint: Fix crash in hw_breakpoint creation	2010-10-18 19:58:55 +02:00
irq_work.c	irq_work: Add generic hardirq context callbacks	2010-10-18 19:58:50 +02:00
itimer.c
jump_label.c	jump label: Make arch_jump_label_text_poke_early() optional	2010-10-29 12:56:13 -04:00
kallsyms.c	Revert "kernel: make /proc/kallsyms mode 400 to reduce ease of attacking"	2010-11-19 11:54:40 -08:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	use clear_page()/copy_page() in favor of memset()/memcpy() on whole pages	2010-10-26 16:52:13 -07:00
kfifo.c	kfifo: fix scatterlist usage	2010-10-01 10:50:58 -07:00
kmod.c	Make do_execve() take a const filename pointer	2010-08-17 18:07:43 -07:00
kprobes.c	jump label: Fix error with preempt disable holding mutex	2010-10-29 12:55:55 -04:00
ksysfs.c	sysfs: add struct file* to bin_attr callbacks	2010-05-21 09:37:31 -07:00
kthread.c	sched: Make sched_param argument static in sched_setscheduler() callers	2010-10-23 17:56:48 +02:00
latencytop.c	latencytop: fix per task accumulator	2010-11-12 07:55:31 -08:00
lockdep.c	lockdep: Check the depth of subclass	2010-10-18 18:44:26 +02:00
lockdep_internals.h	lockdep: No need to disable preemption in debug atomic ops	2010-05-04 05:38:16 +02:00
lockdep_proc.c	lockstat: Make lockstat counting per cpu	2010-04-06 00:15:37 +02:00
lockdep_states.h
Makefile	Merge branch 'core-memblock-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-10-21 18:52:11 -07:00
module.c	(trivial) Fix compiler warning in kernel/modules.c	2010-10-27 20:33:05 +10:30
mutex-debug.c
mutex-debug.h
mutex.c	mutexes, sched: Introduce arch_mutex_cpu_relax()	2010-11-26 15:05:34 +01:00
mutex.h
notifier.c
ns_cgroup.c	cgroup: notify ns_cgroup deprecated	2010-10-27 18:03:09 -07:00
nsproxy.c
padata.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6	2010-08-04 15:23:14 -07:00
panic.c	lib/bug.c: add oops end marker to WARN implementation	2010-08-11 08:59:22 -07:00
params.c	param: locking for kernel parameters	2010-08-11 23:04:20 +09:30
perf_event.c	perf_events: Fix time tracking in samples	2010-11-10 22:58:39 +01:00
pid.c	Add RCU check for find_task_by_vpid().	2010-08-19 17:18:02 -07:00
pid_namespace.c
pm_qos_params.c	PM / PM QoS: Fix reversed min and max	2010-11-15 22:45:22 +01:00
posix-cpu-timers.c	Merge branch 'writable_limits' of git://decibel.fi.muni.cz/~xslaby/linux	2010-08-10 12:07:51 -07:00
posix-timers.c	posix_timer: Move copy_to_user(created_timer_id) down in timer_create()	2010-07-23 15:08:12 +02:00
printk.c	capabilities/syslog: open code cap_syslog logic to fix build failure	2010-11-15 15:40:01 -08:00
profile.c	llseek: automatically add .llseek fop	2010-10-15 15:53:27 +02:00
ptrace.c	signals: move cred_guard_mutex from task_struct to signal_struct	2010-10-27 18:03:12 -07:00
range.c	kernel/range.c: fix clean_sort_range() for the case of full array	2010-11-12 07:55:31 -08:00
rcupdate.c	Merge branch 'rcu/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu into core/rcu	2010-10-07 09:43:11 +02:00
rcutiny.c	rcu: Add a TINY_PREEMPT_RCU	2010-08-20 08:55:00 -07:00
rcutiny_plugin.h	rcu: performance fixes to TINY_PREEMPT_RCU callback checking	2010-08-27 10:51:17 -07:00
rcutorture.c	rcu: fix sparse errors in rcutorture.c	2010-09-23 09:16:42 -07:00
rcutree.c	rcu: using ACCESS_ONCE() to observe the jiffies_stall/rnp->qsmask value	2010-10-07 10:41:06 -07:00
rcutree.h	rcu: Add tracing data to support queueing models	2010-09-23 09:16:53 -07:00
rcutree_plugin.h	rcu: fix _oddness handling of verbose stall warnings	2010-09-02 16:15:30 -07:00
rcutree_trace.c	rcu: Add tracing data to support queueing models	2010-09-23 09:16:53 -07:00
relay.c	Clean up relay_alloc_page_array() slightly by using vzalloc rather than vmalloc and memset	2010-11-05 08:21:34 -07:00
res_counter.c
resource.c	Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6	2010-10-28 11:59:52 -07:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c	rtmutex-tester: make it build without BKL	2010-10-19 11:29:56 +02:00
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c
sched.c	sched: Add 'autogroup' scheduling feature: automated per session task groups	2010-11-30 16:03:35 +01:00
sched_autogroup.c	sched: Add 'autogroup' scheduling feature: automated per session task groups	2010-11-30 16:03:35 +01:00
sched_autogroup.h	sched: Add 'autogroup' scheduling feature: automated per session task groups	2010-11-30 16:03:35 +01:00
sched_clock.c	sched: Add some clock info to sched_debug	2010-11-23 10:29:08 +01:00
sched_cpupri.c	sched: No need for bootmem special cases	2010-07-17 12:06:22 +02:00
sched_cpupri.h	sched: No need for bootmem special cases	2010-07-17 12:06:22 +02:00
sched_debug.c	sched: Add 'autogroup' scheduling feature: automated per session task groups	2010-11-30 16:03:35 +01:00
sched_fair.c	Merge commit 'v2.6.37-rc3' into sched/core	2010-11-26 15:05:21 +01:00
sched_features.h	sched: Rewrite tg_shares_up)	2010-11-18 13:27:46 +01:00
sched_idletask.c	sched: Cure load average vs NO_HZ woes	2010-04-23 11:02:02 +02:00
sched_rt.c	sched: Implement on-demand (active) cfs_rq list	2010-11-18 13:27:47 +01:00
sched_stats.h	sched_stat: Update sched_info_queue/dequeue() code comments	2010-10-24 13:29:01 +02:00
sched_stoptask.c	sched: Fix cross-sched-class wakeup preemption	2010-11-11 14:37:23 +01:00
seccomp.c
semaphore.c
signal.c	signals: annotate lock context change on ptrace_stop()	2010-10-27 18:03:12 -07:00
smp.c	Typedef SMP call function pointer	2010-10-27 17:28:36 +01:00
softirq.c	Merge commit 'v2.6.37-rc2' into sched/core	2010-11-18 13:22:26 +01:00
spinlock.c
srcu.c	kernel: Remove undead ifdef CONFIG_DEBUG_LOCK_ALLOC	2010-09-23 09:14:51 -07:00
stacktrace.c
stop_machine.c	stop_machine: convert cpu notifier to return encapsulate errno value	2010-10-26 16:52:15 -07:00
sys.c	sched: Add 'autogroup' scheduling feature: automated per session task groups	2010-11-30 16:03:35 +01:00
sys_ni.c	powerpc: define a compat_sys_recv cond_syscall	2010-09-23 17:03:55 +10:00
sysctl.c	sched: Add 'autogroup' scheduling feature: automated per session task groups	2010-11-30 16:03:35 +01:00
sysctl_binary.c	sysctl: don't use own implementation of hex_to_bin()	2010-05-25 08:07:05 -07:00
sysctl_check.c	sysctl: min/max bounds are optional	2010-10-15 14:42:24 -07:00
taskstats.c	taskstats: split fill_pid function	2010-10-27 18:03:17 -07:00
test_kprobes.c	kprobes: Fix selftest to clear flags field for reusing probes	2010-10-14 08:55:27 +02:00
time.c	time: Kill off CONFIG_GENERIC_TIME	2010-07-27 12:40:54 +02:00
timeconst.pl
timer.c	irq_work: Add generic hardirq context callbacks	2010-10-18 19:58:50 +02:00
tracepoint.c	jump_label: Use more consistent naming	2010-10-18 19:58:56 +02:00
tsacct.c	taskstats: use real microsecond granularity for CPU times	2010-10-27 18:03:17 -07:00
uid16.c
up.c
user-return-notifier.c
user.c	kernel/user.c: add lock release annotation on free_user()	2010-10-26 16:52:15 -07:00
user_namespace.c	user_ns: Introduce user_nsmap_uid and user_ns_map_gid.	2010-06-16 14:55:34 -07:00
utsname.c
utsname_sysctl.c
wait.c	docbook: add more wait/wake/completion to device-drivers docbook	2010-10-26 17:32:41 -07:00
watchdog.c	Merge commit 'v2.6.37-rc2' into sched/core	2010-11-18 13:22:26 +01:00
workqueue.c	workqueues: s/ON_STACK/ONSTACK/	2010-10-26 16:52:14 -07:00
workqueue_sched.h	workqueue: implement concurrency managed dynamic worker pool	2010-06-29 10:07:14 +02:00