Alexander Shishkin 37014e0c5c perf/core: Fix perf_sched_count derailment ...

commit 927a557085 upstream.

The error path in perf_event_open() is such that asking for a sampling
event on a PMU that doesn't generate interrupts will end up in dropping
the perf_sched_count even though it hasn't been incremented for this
event yet.

Given a sufficient amount of these calls, we'll end up disabling
scheduler's jump label even though we'd still have active events in the
system, thereby facilitating the arrival of the infernal regions upon us.

I'm fixing this by moving account_event() inside perf_event_alloc().

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
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: vince@deater.net
Link: http://lkml.kernel.org/r/1456917854-29427-1-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2016-04-12 09:08:34 -07:00

..

bpf

bpf: fix branch offset adjustment on backjumps after patching ctx expansion

2016-03-03 15:07:06 -08:00

configs

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debug

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events

perf/core: Fix perf_sched_count derailment

2016-04-12 09:08:34 -07:00

gcov

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irq

genirq: Validate action before dereferencing it in handle_irq_event_percpu()

2016-03-03 15:07:11 -08:00

livepatch

livepatch: x86: fix relocation computation with kASLR

2015-11-11 17:36:04 +01:00

locking

locking/osq: Fix ordering of node initialisation in osq_lock

2015-12-17 11:40:29 -08:00

power

mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM

2015-11-06 17:50:42 -08:00

printk

printk: do cond_resched() between lines while outputting to consoles

2016-02-17 12:30:57 -08:00

rcu

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sched

sched: Fix crash in sched_init_numa()

2016-02-17 12:31:02 -08:00

time

tick/nohz: Set the correct expiry when switching to nohz/lowres mode

2016-03-03 15:07:26 -08:00

trace

tracing: Do not have 'comm' filter override event 'comm' field

2016-03-09 15:34:52 -08:00

.gitignore

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acct.c

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async.c

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audit_fsnotify.c

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audit_tree.c

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audit_watch.c

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audit.c

mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd

2015-11-06 17:50:42 -08:00

audit.h

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auditfilter.c

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auditsc.c

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backtracetest.c

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bounds.c

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capability.c

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cgroup_freezer.c

cgroup: fix handling of multi-destination migration from subtree_control enabling

2015-12-03 10:18:21 -05:00

cgroup_pids.c

cgroup_pids: don't account for the root cgroup

2015-12-03 10:18:21 -05:00

cgroup.c

cgroup: make sure a parent css isn't offlined before its children

2016-03-03 15:07:28 -08:00

compat.c

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configs.c

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context_tracking.c

context_tracking: avoid irq_save/irq_restore on guest entry and exit

2015-11-10 12:06:23 +01:00

cpu_pm.c

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cpu.c

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cpuset.c

cpuset: make mm migration asynchronous

2016-03-03 15:07:28 -08:00

crash_dump.c

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cred.c

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delayacct.c

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dma.c

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elfcore.c

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exec_domain.c

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exit.c

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extable.c

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fork.c

sched/core: Reset task's lockless wake-queues on fork()

2016-01-06 11:01:07 +01:00

freezer.c

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futex_compat.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

futex.c

futex: Drop refcount if requeue_pi() acquired the rtmutex

2016-02-25 12:01:23 -08:00

groups.c

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hung_task.c

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irq_work.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

jump_label.c

treewide: Remove old email address

2015-11-23 09:44:58 +01:00

kallsyms.c

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kcmp.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

Kconfig.freezer

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Kconfig.hz

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Kconfig.locks

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Kconfig.preempt

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kexec_core.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kexec_file.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kexec_internal.h

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kexec.c

kexec: use file name as the output message prefix

2015-11-06 17:50:42 -08:00

kmod.c

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kprobes.c

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ksysfs.c

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kthread.c

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latencytop.c

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Makefile

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membarrier.c

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memremap.c

devm_memremap: Fix error value when memremap failed

2016-03-03 15:07:08 -08:00

module_signing.c

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module-internal.h

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module.c

modules: fix longstanding /proc/kallsyms vs module insertion race.

2016-03-09 15:34:56 -08:00

notifier.c

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nsproxy.c

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padata.c

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panic.c

printk: do cond_resched() between lines while outputting to consoles

2016-02-17 12:30:57 -08:00

params.c

Merge tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux

2015-11-09 15:53:39 -08:00

pid_namespace.c

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pid.c

pidns: fix NULL dereference in __task_pid_nr_ns()

2015-11-24 12:03:55 -08:00

profile.c

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ptrace.c

ptrace: use fsuid, fsgid, effective creds for fs access checks

2016-02-25 12:01:16 -08:00

range.c

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reboot.c

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relay.c

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resource.c

kernel/resource.c: fix muxed resource handling in __request_region()

2016-03-03 15:07:29 -08:00

seccomp.c

seccomp: always propagate NO_NEW_PRIVS on tsync

2016-03-03 15:07:25 -08:00

signal.c

kernel/signal.c: unexport sigsuspend()

2015-11-20 16:17:32 -08:00

smp.c

mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd

2015-11-06 17:50:42 -08:00

smpboot.c

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smpboot.h

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softirq.c

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stacktrace.c

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stop_machine.c

kernel: remove stop_machine() Kconfig dependency

2015-12-12 10:15:34 -08:00

sys_ni.c

mm: mlock: add new mlock system call

2015-11-05 19:34:48 -08:00

sys.c

prctl: take mmap sem for writing to protect against others

2016-02-25 12:01:25 -08:00

sysctl_binary.c

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sysctl.c

kernel/watchdog.c: add sysctl knob hardlockup_panic

2015-11-05 19:34:48 -08:00

task_work.c

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taskstats.c

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test_kprobes.c

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torture.c

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tracepoint.c

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tsacct.c

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uid16.c

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up.c

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user_namespace.c

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user-return-notifier.c

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user.c

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utsname_sysctl.c

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utsname.c

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watchdog.c

kernel/watchdog.c: fix race between proc_watchdog_thresh() and watchdog_timer_fn()

2015-11-05 19:34:48 -08:00

workqueue_internal.h

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workqueue.c

Revert "workqueue: make sure delayed work run in local cpu"

2016-03-03 15:07:27 -08:00