Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Peter Zijlstra d8a8cfc769 perf/core: Better explain the inherit magic ... While going through the event inheritance code Oleg got confused. Add some comments to better explain the silent dissapearance of orphaned events. So what happens is that at perf_event_release_kernel() time; when an event looses its connection to userspace (and ceases to exist from the user's perspective) we can still have an arbitrary amount of inherited copies of the event. We want to synchronously find and remove all these child events. Since that requires a bit of lock juggling, there is the possibility that concurrent clone()s will create new child events. Therefore we first mark the parent event as DEAD, which marks all the extant child events as orphaned. We then avoid copying orphaned events; in order to avoid getting more of them. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: fweisbec@gmail.com Link: http://lkml.kernel.org/r/20170316125823.289567442@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>		2017-03-16 14:16:53 +01:00
..
bpf	bpf: fix spelling mistake: "proccessed" -> "processed"	2017-02-23 10:46:08 -05:00
cgroup	Merge branch 'for-4.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2017-02-27 21:41:08 -08:00
configs	config: android-base: enable hardened usercopy and kernel ASLR	2017-02-27 18:43:46 -08:00
debug	kdb: call vkdb_printf() from vprintk_default() only when wanted	2016-12-14 16:04:08 -08:00
events	perf/core: Better explain the inherit magic	2017-03-16 14:16:53 +01:00
gcov
irq	scripts/spelling.txt: add "an user" pattern and fix typo instances	2017-02-27 18:43:46 -08:00
livepatch
locking	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-02-20 13:23:30 -08:00
power	This renames the (now inaccurate) CONFIG_DEBUG_RODATA and related config	2017-02-21 17:56:45 -08:00
printk	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk	2017-02-22 17:33:34 -08:00
rcu	Merge branches 'doc.2017.01.15b', 'dyntick.2017.01.23a', 'fixes.2017.01.23a', 'srcu.2017.01.25a' and 'torture.2017.01.15b' into HEAD	2017-01-25 12:56:05 -08:00
sched	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-02-28 11:44:01 -08:00
time	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2017-02-20 12:52:55 -08:00
trace	perf/core: Rename CONFIG_[UK]PROBE_EVENT to CONFIG_[UK]PROBE_EVENTS	2017-03-01 10:26:39 +01:00
.gitignore
acct.c	acct: Convert obsolete cputime type to nsecs	2017-02-01 09:13:51 +01:00
async.c
audit.c	Merge branch 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit	2017-02-21 13:25:50 -08:00
audit.h	Merge branch 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit	2017-02-21 13:25:50 -08:00
audit_fsnotify.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-12-17 18:44:00 -08:00
audit_tree.c	Merge branch 'stable-4.10' of git://git.infradead.org/users/pcmoore/audit	2017-01-05 23:06:06 -08:00
audit_watch.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2016-12-17 18:44:00 -08:00
auditfilter.c	audit: add support for session ID user filter	2016-11-29 15:10:12 -05:00
auditsc.c	Merge branch 'stable-4.11' of git://git.infradead.org/users/pcmoore/audit	2017-02-21 13:25:50 -08:00
backtracetest.c
bounds.c
capability.c	capability: export has_capability	2017-01-12 07:01:56 -07:00
compat.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
configs.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
context_tracking.c
cpu.c	cpu/hotplug: Remove unused but set variable in _cpu_down()	2017-01-18 11:55:09 +01:00
cpu_pm.c
crash_dump.c
cred.c
delayacct.c	delaycct: Convert obsolete cputime type to nsecs	2017-02-01 09:13:52 +01:00
dma.c
elfcore.c
exec_domain.c
exit.c	mm: add new mmgrab() helper	2017-02-27 18:43:48 -08:00
extable.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2017-02-22 10:15:09 -08:00
fork.c	mm: add new mmget() helper	2017-02-27 18:43:48 -08:00
freezer.c
futex.c	mm: add new mmgrab() helper	2017-02-27 18:43:48 -08:00
futex_compat.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
groups.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
hung_task.c	hung_task: decrement sysctl_hung_task_warnings only if it is positive	2016-12-12 18:55:09 -08:00
irq_work.c
jump_label.c	This release has no new tracing features, just clean ups, minor fixes	2017-02-27 13:26:17 -08:00
kallsyms.c	bpf: make jited programs visible in traces	2017-02-17 13:40:05 -05:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/mutex: Allow MUTEX_SPIN_ON_OWNER when DEBUG_MUTEXES	2016-10-25 11:31:51 +02:00
Kconfig.preempt
kcov.c	kcov: make kcov work properly with KASLR enabled	2016-12-20 09:48:47 -08:00
kexec.c
kexec_core.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk	2017-02-22 17:33:34 -08:00
kexec_file.c	ima: on soft reboot, save the measurement list	2016-12-20 09:48:44 -08:00
kexec_internal.h	kexec_file: Allow arch-specific memory walking for kexec_add_buffer	2016-11-30 23:14:57 +11:00
kmod.c	Introduce STATIC_USERMODEHELPER to mediate call_usermodehelper()	2017-01-19 12:59:45 +01:00
kprobes.c	powerpc updates for 4.11 part 1.	2017-02-22 10:30:38 -08:00
ksysfs.c	kernel/ksysfs.c: add __ro_after_init to bin_attribute structure	2017-02-24 17:46:56 -08:00
kthread.c	time: Remove CONFIG_TIMER_STATS	2017-02-10 11:15:08 +01:00
latencytop.c
Makefile	cgroup: move cgroup files under kernel/cgroup/	2016-12-27 14:49:05 -05:00
membarrier.c	Fix: Disable sys_membarrier when nohz_full is enabled	2017-01-23 11:32:16 -08:00
memremap.c	mm, devm_memremap_pages: hold device_hotplug lock over mem_hotplug_{begin, done}	2017-02-24 17:46:53 -08:00
module-internal.h
module.c	Modules updates for v4.11	2017-02-22 17:08:33 -08:00
module_signing.c
notifier.c	kernel/notifier.c: simplify expression	2017-02-24 17:46:56 -08:00
nsproxy.c
padata.c	padata: Remove unused but set variables	2016-10-25 11:08:10 +08:00
panic.c	sparc64: Send break twice from console to return to boot prom	2017-02-23 08:27:24 -08:00
params.c
pid.c	locking/atomic, kref: Add KREF_INIT()	2017-01-14 11:37:18 +01:00
pid_namespace.c	pid: fix lockdep deadlock warning due to ucount_lock	2017-01-10 13:34:56 +13:00
profile.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
ptrace.c	ptrace: Don't allow accessing an undumpable mm	2016-11-22 12:57:38 -06:00
range.c
reboot.c
relay.c	lib/vsprintf.c: remove %Z support	2017-02-27 18:43:47 -08:00
resource.c
seccomp.c	seccomp: Only dump core when single-threaded	2017-02-23 09:42:35 +11:00
signal.c	sigaltstack: support SS_AUTODISARM for CONFIG_COMPAT	2017-02-27 18:43:45 -08:00
smp.c	kernel/smp: Tell the user we're bringing up secondary CPUs	2016-10-26 12:02:35 +02:00
smpboot.c	kthread/smpboot: do not park in kthread_create_on_cpu()	2016-10-11 15:06:33 -07:00
smpboot.h
softirq.c	softirq: Display IRQ_POLL for irq-poll statistics	2016-10-21 15:45:47 -06:00
stacktrace.c	stacktrace, lockdep: Fix address, newline ugliness	2017-02-08 08:21:31 +01:00
stop_machine.c	locking/core, stop_machine: Yield the CPU during stop machine()	2016-11-16 10:15:09 +01:00
sys.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2017-02-23 20:33:51 -08:00
sys_ni.c	move aio compat to fs/aio.c	2016-12-22 22:58:37 -05:00
sysctl.c	sched/rt: Show the 'sched_rr_timeslice' SCHED_RR timeslice tuning knob in milliseconds	2017-02-01 11:01:30 +01:00
sysctl_binary.c	sysctl: add KERN_CONT to deprecated_sysctl_warning()	2016-12-14 16:04:07 -08:00
task_work.c
taskstats.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2016-11-15 10:54:36 -05:00
test_kprobes.c
torture.c	scripts/spelling.txt: add "varible" pattern and fix typo instances	2017-02-27 18:43:47 -08:00
tracepoint.c	tracing: Have the reg function allow to fail	2016-12-09 09:13:30 -05:00
tsacct.c	tsacct: Convert obsolete cputime type to nsecs	2017-02-01 09:13:52 +01:00
ucount.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2017-02-23 20:33:51 -08:00
uid16.c	Replace <asm/uaccess.h> with <linux/uaccess.h> globally	2016-12-24 11:46:01 -08:00
up.c	smp: Add function to execute a function synchronously on a CPU	2016-09-05 13:52:39 +02:00
user-return-notifier.c
user.c
user_namespace.c	Merge branch 'nsfs-ioctls' into HEAD	2016-09-22 20:00:36 -05:00
utsname.c	Merge branch 'nsfs-ioctls' into HEAD	2016-09-22 20:00:36 -05:00
utsname_sysctl.c
watchdog.c	kernel/watchdog: prevent false hardlockup on overloaded system	2017-01-24 16:26:14 -08:00
watchdog_hld.c	kernel/watchdog.c: do not hardcode CPU 0 as the initial thread	2017-02-22 16:41:27 -08:00
workqueue.c	time: Remove CONFIG_TIMER_STATS	2017-02-10 11:15:08 +01:00
workqueue_internal.h