Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Venkatesh Pallipadi 2f36825b17 sched: Next buddy hint on sleep and preempt path ... When a task in a taskgroup sleeps, pick_next_task starts all the way back at the root and picks the task/taskgroup with the min vruntime across all runnable tasks. But when there are many frequently sleeping tasks across different taskgroups, it makes better sense to stay with same taskgroup for its slice period (or until all tasks in the taskgroup sleeps) instead of switching cross taskgroup on each sleep after a short runtime. This helps specifically where taskgroups corresponds to a process with multiple threads. The change reduces the number of CR3 switches in this case. Example: Two taskgroups with 2 threads each which are running for 2ms and sleeping for 1ms. Looking at sched:sched_switch shows: BEFORE: taskgroup_1 threads [5004, 5005], taskgroup_2 threads [5016, 5017] cpu-soaker-5004 [003] 3683.391089 cpu-soaker-5016 [003] 3683.393106 cpu-soaker-5005 [003] 3683.395119 cpu-soaker-5017 [003] 3683.397130 cpu-soaker-5004 [003] 3683.399143 cpu-soaker-5016 [003] 3683.401155 cpu-soaker-5005 [003] 3683.403168 cpu-soaker-5017 [003] 3683.405170 AFTER: taskgroup_1 threads [21890, 21891], taskgroup_2 threads [21934, 21935] cpu-soaker-21890 [003] 865.895494 cpu-soaker-21935 [003] 865.897506 cpu-soaker-21934 [003] 865.899520 cpu-soaker-21935 [003] 865.901532 cpu-soaker-21934 [003] 865.903543 cpu-soaker-21935 [003] 865.905546 cpu-soaker-21891 [003] 865.907548 cpu-soaker-21890 [003] 865.909560 cpu-soaker-21891 [003] 865.911571 cpu-soaker-21890 [003] 865.913582 cpu-soaker-21891 [003] 865.915594 cpu-soaker-21934 [003] 865.917606 Similar problem is there when there are multiple taskgroups and say a task A preempts currently running task B of taskgroup_1. On schedule, pick_next_task can pick an unrelated task on taskgroup_2. Here it would be better to give some preference to task B on pick_next_task. A simple (may be extreme case) benchmark I tried was tbench with 2 tbench client processes with 2 threads each running on a single CPU. Avg throughput across 5 50 sec runs was: BEFORE: 105.84 MB/sec AFTER: 112.42 MB/sec Signed-off-by: Venkatesh Pallipadi <venki@google.com> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1302802253-25760-1-git-send-email-venki@google.com Signed-off-by: Ingo Molnar <mingo@elte.hu>		2011-04-19 10:08:38 +02:00
..
debug	Fix common misspellings	2011-03-31 11:26:23 -03:00
gcov	Merge branch 'trivial' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild-2.6	2011-03-20 18:14:55 -07:00
irq	Merge branches 'x86-fixes-for-linus', 'sched-fixes-for-linus', 'timers-fixes-for-linus', 'irq-fixes-for-linus' and 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-04-07 12:12:58 -07:00
power	fix XEN_SAVE_RESTORE Kconfig dependencies	2011-04-11 22:54:48 +02:00
time	Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6	2011-04-07 11:14:49 -07:00
trace	Fix common misspellings	2011-03-31 11:26:23 -03:00
.gitignore
acct.c
async.c
audit.c	netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms	2011-03-03 10:55:40 -08:00
audit.h
audit_tree.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
audit_watch.c	kill path_lookup()	2011-03-14 09:15:23 -04:00
auditfilter.c	netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms	2011-03-03 10:55:40 -08:00
auditsc.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
backtracetest.c
bounds.c	memcg: remove direct page_cgroup-to-page pointer	2011-03-23 19:46:28 -07:00
capability.c	userns: make has_capability* into real functions	2011-03-23 19:47:06 -07:00
cgroup.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
cgroup_freezer.c
compat.c	posix-timers: Introduce a syscall for clock tuning.	2011-02-02 15:28:19 +01:00
configs.c
cpu.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
cpuset.c	sched: Dynamic sched_domain::level	2011-04-11 14:09:32 +02:00
crash_dump.c	crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn	2011-03-23 19:47:19 -07:00
cred.c	userns: security: make capabilities relative to the user namespace	2011-03-23 19:47:02 -07:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
extable.c
fork.c	Merge branch 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block	2011-03-24 10:16:26 -07:00
freezer.c
futex.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-03-25 17:52:22 -07:00
futex_compat.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
groups.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
hrtimer.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-03-15 18:53:35 -07:00
hung_task.c
hw_breakpoint.c
irq_work.c
itimer.c
jump_label.c
kallsyms.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-03-25 17:52:22 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	Merge branch 'for-linus2' of git://git.profusion.mobi/users/lucas/linux-2.6	2011-04-07 11:14:49 -07:00
kfifo.c
kmod.c
kprobes.c
ksysfs.c
kthread.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
latencytop.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
lockdep.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
lockdep_internals.h
lockdep_proc.c	lockdep: Remove unused 'factor' variable from lockdep_stats_show()	2011-03-23 13:54:47 +01:00
lockdep_states.h
Makefile	crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn	2011-03-23 19:47:19 -07:00
module.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
mutex-debug.c	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
mutex-debug.h	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
mutex.c	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
mutex.h	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
notifier.c
ns_cgroup.c
nsproxy.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
padata.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
panic.c	move x86 specific oops=panic to generic code	2011-03-22 17:44:11 -07:00
params.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
perf_event.c	perf: Fix task_struct reference leak	2011-03-31 13:02:56 +02:00
pid.c	export pid symbols needed for kvm_vcpu_on_spin	2011-03-17 13:08:28 -03:00
pid_namespace.c	pidns: call pid_ns_prepare_proc() from create_pid_namespace()	2011-03-23 19:46:58 -07:00
pm_qos_params.c	PM QoS: Make pm_qos settings readable	2011-03-15 00:43:18 +01:00
posix-cpu-timers.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
posix-timers.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
printk.c	printk: allow setting DEFAULT_MESSAGE_LEVEL via Kconfig	2011-03-22 17:44:13 -07:00
profile.c
ptrace.c	userns: allow ptrace from non-init user namespaces	2011-03-23 19:47:05 -07:00
range.c
rcupdate.c	rcu: add comment saying why DEBUG_OBJECTS_RCU_HEAD depends on PREEMPT.	2011-03-04 08:05:41 -08:00
rcutiny.c	rcu: avoid pointless blocked-task warnings	2011-01-14 04:58:08 -08:00
rcutiny_plugin.h	rcu: call __rcu_read_unlock() in exit_rcu for tiny RCU	2011-03-04 08:05:08 -08:00
rcutorture.c	rcutorture: Get rid of duplicate sched.h include	2011-03-04 08:05:17 -08:00
rcutree.c
rcutree.h
rcutree_plugin.h
rcutree_trace.c
relay.c
res_counter.c	memcg: res_counter_read_u64(): fix potential races on 32-bit machines	2011-03-23 19:46:22 -07:00
resource.c
rtmutex-debug.c	rtmutex: Simplify PI algorithm and make highest prio task get lock	2011-01-27 21:13:51 -05:00
rtmutex-debug.h
rtmutex-tester.c	rtmutex: tester: Remove the remaining BKL leftovers	2011-02-22 22:07:22 +01:00
rtmutex.c	rtmutex: Simplify PI algorithm and make highest prio task get lock	2011-01-27 21:13:51 -05:00
rtmutex.h
rtmutex_common.h	rtmutex: Simplify PI algorithm and make highest prio task get lock	2011-01-27 21:13:51 -05:00
rwsem.c
sched.c	Merge branch 'sched/locking' into sched/core	2011-04-18 14:53:33 +02:00
sched_autogroup.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
sched_autogroup.h	sched, autogroup: Stop going ahead if autogroup is disabled	2011-02-23 11:33:59 +01:00
sched_clock.c
sched_cpupri.c
sched_cpupri.h
sched_debug.c	sched: Provide p->on_rq	2011-04-14 08:52:35 +02:00
sched_fair.c	sched: Next buddy hint on sleep and preempt path	2011-04-19 10:08:38 +02:00
sched_features.h	sched: Move the second half of ttwu() to the remote cpu	2011-04-14 08:52:41 +02:00
sched_idletask.c	sched: Drop the rq argument to sched_class::select_task_rq()	2011-04-14 08:52:36 +02:00
sched_rt.c	sched: Drop the rq argument to sched_class::select_task_rq()	2011-04-14 08:52:36 +02:00
sched_stats.h
sched_stoptask.c	sched: Drop the rq argument to sched_class::select_task_rq()	2011-04-14 08:52:36 +02:00
seccomp.c
semaphore.c
signal.c	signal.c: fix erroneous syscall kernel-doc	2011-04-08 11:05:24 -07:00
smp.c	smp: move smp setup functions to kernel/smp.c	2011-03-22 17:44:11 -07:00
softirq.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
spinlock.c
srcu.c	rcu: demote SRCU_SYNCHRONIZE_DELAY from kernel-parameter status	2011-01-14 04:56:49 -08:00
stacktrace.c
stop_machine.c	kthread: use kthread_create_on_node()	2011-03-22 17:44:01 -07:00
sys.c	userns: user namespaces: convert all capable checks in kernel/sys.c	2011-03-23 19:47:06 -07:00
sys_ni.c	vfs: Add open by file handle support	2011-03-15 02:21:44 -04:00
sysctl.c	sysctl: restrict write access to dmesg_restrict	2011-03-23 19:46:54 -07:00
sysctl_binary.c	open-style analog of vfs_path_lookup()	2011-03-14 09:15:28 -04:00
sysctl_check.c	sysctl_check: drop dead code	2011-03-23 19:46:51 -07:00
taskstats.c	taskstats: use appropriate printk priority level	2011-03-23 19:47:14 -07:00
test_kprobes.c
time.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-03-15 18:53:35 -07:00
timeconst.pl
timer.c	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-03-15 18:53:35 -07:00
tracepoint.c	tracepoints: Fix section alignment using pointer array	2011-02-03 09:28:46 -05:00
tsacct.c
uid16.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
up.c
user-return-notifier.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
user.c	userns: add a user_namespace as creator/owner of uts_namespace	2011-03-23 19:46:59 -07:00
user_namespace.c
utsname.c	userns: allow sethostname in a container	2011-03-23 19:47:03 -07:00
utsname_sysctl.c
wait.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
watchdog.c	kernel/watchdog.c: always return NOTIFY_OK during cpu up/down events	2011-03-22 17:44:12 -07:00
workqueue.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
workqueue_sched.h