Brian Silverman da71549028 sched: Fix RLIMIT_RTTIME when PI-boosting to RT ... commit 746db9443e upstream. When non-realtime tasks get priority-inheritance boosted to a realtime scheduling class, RLIMIT_RTTIME starts to apply to them. However, the counter used for checking this (the same one used for SCHED_RR timeslices) was not getting reset. This meant that tasks running with a non-realtime scheduling class which are repeatedly boosted to a realtime one, but never block while they are running realtime, eventually hit the timeout without ever running for a time over the limit. This patch resets the realtime timeslice counter when un-PI-boosting from an RT to a non-RT scheduling class. I have some test code with two threads and a shared PTHREAD_PRIO_INHERIT mutex which induces priority boosting and spins while boosted that gets killed by a SIGXCPU on non-fixed kernels but doesn't with this patch applied. It happens much faster with a CONFIG_PREEMPT_RT kernel, and does happen eventually with PREEMPT_VOLUNTARY kernels. Signed-off-by: Brian Silverman <brian@peloton-tech.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: austin@peloton-tech.com Link: http://lkml.kernel.org/r/1424305436-6716-1-git-send-email-brian@peloton-tech.com Signed-off-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2015-04-19 10:11:06 +02:00
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cpu	sched/preempt: Fix up missed PREEMPT_NEED_RESCHED folding	2014-01-13 17:38:55 +01:00
debug	kdb: fix incorrect counts in KDB summary command output	2015-03-06 14:43:30 -08:00
events	perf: Fix irq_work 'tail' recursion	2015-04-13 14:03:01 +02:00
gcov	…
irq	genirq: Prevent proc race against freeing of irq descriptors	2015-01-27 08:18:55 -08:00
locking	rtmutex: Plug slow unlock race	2014-06-30 20:11:58 -07:00
power	PM / Sleep: fix recovery during resuming from hibernation	2014-11-14 09:00:10 -08:00
printk	console: Fix console name size mismatch	2015-03-26 15:06:53 +01:00
rcu	rcu: Use rcu_gp_kthread_wake() to wake up grace period kthreads	2014-11-21 09:23:05 -08:00
sched	sched: Fix RLIMIT_RTTIME when PI-boosting to RT	2015-04-19 10:11:06 +02:00
time	ntp: Fixup adjtimex freq validation on 32-bit systems	2015-03-06 14:43:30 -08:00
trace	tracing: Fix unmapping loop in tracing_mark_write	2015-03-06 14:43:28 -08:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.locks	locking/mutex: Disable optimistic spinning on some architectures	2014-07-28 08:06:03 -07:00
Kconfig.preempt	…
Makefile	…
acct.c	…
async.c	…
audit.c	audit: AUDIT_FEATURE_CHANGE message format missing delimiting space	2014-11-21 09:23:01 -08:00
audit.h	audit: Use struct net not pid_t to remember the network namespce to reply in	2014-02-28 04:04:33 -08:00
audit_tree.c	audit: keep inode pinned	2014-11-21 09:23:01 -08:00
audit_watch.c	inotify: Fix reporting of cookies for inotify events	2014-02-18 11:17:17 +01:00
auditfilter.c	audit: restore AUDIT_LOGINUID unset ABI	2015-01-08 10:00:50 -08:00
auditsc.c	audit: remove superfluous new- prefix in AUDIT_LOGIN messages	2014-07-09 11:18:28 -07:00
backtracetest.c	…
bounds.c	…
capability.c	CAPABILITIES: remove undefined caps from all processes	2014-09-17 09:19:09 -07:00
cgroup.c	cgroup: fix unbalanced locking	2014-10-05 14:52:17 -07:00
cgroup_freezer.c	…
compat.c	…
configs.c	…
context_tracking.c	…
cpu.c	sched: Fix hotplug vs. set_cpus_allowed_ptr()	2014-06-11 11:54:11 -07:00
cpu_pm.c	…
cpuset.c	cpuset: Fix cpuset sched_relax_domain_level	2015-03-26 15:06:54 +01:00
crash_dump.c	…
cred.c	…
delayacct.c	…
dma.c	…
elfcore.c	…
exec_domain.c	…
exit.c	exit: call disassociate_ctty() before exit_task_namespaces()	2014-04-26 17:19:07 -07:00
extable.c	…
fork.c	mm: per-thread vma caching	2014-10-09 12:21:29 -07:00
freezer.c	freezer: Do not freeze tasks killed by OOM killer	2014-11-14 09:00:01 -08:00
futex.c	futex: Ensure get_futex_key_refs() always implies a barrier	2014-10-30 09:38:24 -07:00
futex_compat.c	…
groups.c	userns: Don't allow setgroups until a gid mapping has been setablished	2015-01-08 10:00:50 -08:00
hrtimer.c	hrtimer: Set expiry time before switch_hrtimer_base()	2014-06-07 10:28:12 -07:00
hung_task.c	hung_task: Display every hung task warning	2014-01-25 12:13:33 +01:00
irq_work.c	…
itimer.c	…
jump_label.c	…
kallsyms.c	…
kcmp.c	kcmp: fix standard comparison bug	2014-10-05 14:52:20 -07:00
kexec.c	powerpc, kexec: Fix "Processor X is stuck" issue during kexec from ST mode	2014-06-07 10:28:28 -07:00
kmod.c	execve: use 'struct filename *' for executable name passing	2014-02-05 12:54:53 -08:00
kprobes.c	…
ksysfs.c	kdump: fix exported size of vmcoreinfo note	2014-01-23 16:37:03 -08:00
kthread.c	kthread: fix return value of kthread_create() upon SIGKILL.	2014-06-30 20:11:53 -07:00
latencytop.c	…
module-internal.h	…
module.c	modules, lock around setting of MODULE_STATE_UNFORMED	2014-11-14 08:59:52 -08:00
module_signing.c	…
notifier.c	…
nsproxy.c	…
padata.c	…
panic.c	…
params.c	…
pid.c	exit: pidns: alloc_pid() leaks pid_namespace if child_reaper is exiting	2015-01-08 10:00:50 -08:00
pid_namespace.c	pid_namespace: pidns_get() should check task_active_pid_ns() != NULL	2014-04-26 17:19:04 -07:00
posix-cpu-timers.c	…
posix-timers.c	posix-timers: Fix stack info leak in timer_create()	2014-11-14 09:00:10 -08:00
profile.c	mm: fix GFP_THISNODE callers and clarify	2014-03-10 17:26:19 -07:00
ptrace.c	…
range.c	…
reboot.c	…
relay.c	…
res_counter.c	…
resource.c	…
seccomp.c	…
signal.c	kernel/signal.c: change do_signal_stop/do_sigaction to use while_each_thread()	2014-01-23 16:37:02 -08:00
smp.c	kernel/smp.c:on_each_cpu_cond(): fix warning in fallback path	2014-09-17 09:19:09 -07:00
smpboot.c	smpboot: Add missing get_online_cpus() in smpboot_register_percpu_thread()	2015-02-11 14:54:49 +08:00
smpboot.h	…
softirq.c	Merge branch 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2014-01-31 09:02:51 -08:00
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.c	kernel/sys.c: k_getrusage() can use while_each_thread()	2014-01-23 16:37:02 -08:00
sys_ni.c	…
sysctl.c	mm, pcp: allow restoring percpu_pagelist_fraction default	2014-07-09 11:18:26 -07:00
sysctl_binary.c	…
system_certificates.S	…
system_keyring.c	…
task_work.c	…
taskstats.c	…
test_kprobes.c	…
time.c	time: settimeofday: Validate the values of tv from user	2015-01-29 17:40:49 -08:00
timeconst.bc	…
timer.c	timer: Prevent overflow in apply_slack	2014-06-07 10:28:09 -07:00
tracepoint.c	tracepoint: Do not waste memory on mods with no tracepoints	2014-05-31 13:20:28 -07:00
tsacct.c	…
uid16.c	groups: Consolidate the setgroups permission checks	2015-01-08 10:00:49 -08:00
up.c	…
user-return-notifier.c	…
user.c	userns: Add a knob to disable setgroups on a per user namespace basis	2015-01-08 10:00:50 -08:00
user_namespace.c	userns: Allow setting gid_maps without privilege when setgroups is disabled	2015-01-08 10:00:50 -08:00
utsname.c	…
utsname_sysctl.c	…
watchdog.c	kernel/watchdog.c: remove preemption restrictions when restarting lockup detector	2014-07-06 18:57:27 -07:00
workqueue.c	workqueue: fix hang involving racing cancel[_delayed]_work_sync()'s for PREEMPT_NONE	2015-03-26 15:06:54 +01:00
workqueue_internal.h	…