Song Liu f792565326 perf/core: fix userpage->time_enabled of inactive events ... Users of rdpmc rely on the mmapped user page to calculate accurate time_enabled. Currently, userpage->time_enabled is only updated when the event is added to the pmu. As a result, inactive event (due to counter multiplexing) does not have accurate userpage->time_enabled. This can be reproduced with something like: /* open 20 task perf_event "cycles", to create multiplexing */ fd = perf_event_open(); /* open task perf_event "cycles" */ userpage = mmap(fd); /* use mmap and rdmpc */ while (true) { time_enabled_mmap = xxx; /* use logic in perf_event_mmap_page */ time_enabled_read = read(fd).time_enabled; if (time_enabled_mmap > time_enabled_read) BUG(); } Fix this by updating userpage for inactive events in merge_sched_in. Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reported-and-tested-by: Lucian Grijincu <lucian@fb.com> Signed-off-by: Song Liu <songliubraving@fb.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210929194313.2398474-1-songliubraving@fb.com		2021-10-01 13:57:54 +02:00
..
bpf	bpf: Add oversize check before call kvcalloc()	2021-09-13 16:28:15 -07:00
cgroup	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf	2021-09-14 13:09:54 +01:00
configs
debug
dma	dma-mapping fixes for Linux 5.15	2021-09-17 11:54:48 -07:00
entry
events	perf/core: fix userpage->time_enabled of inactive events	2021-10-01 13:57:54 +02:00
gcov
irq
kcsan
livepatch
locking	locking/rwbase: Take care of ordering guarantee for fastpath reader	2021-09-15 17:49:16 +02:00
power
printk	memblock: introduce saner 'memblock_free_ptr()' interface	2021-09-14 13:23:22 -07:00
rcu
sched	- Make sure the idle timer expires in hardirq context, on PREEMPT_RT	2021-09-12 11:37:41 -07:00
time
trace	Minor fixes to the processing of the bootconfig tree.	2021-09-11 10:16:30 -07:00
.gitignore
acct.c
async.c
audit.c
audit.h
audit_fsnotify.c
audit_tree.c
audit_watch.c
auditfilter.c
auditsc.c
backtracetest.c
bounds.c
capability.c
cfi.c
compat.c	arch: remove compat_alloc_user_space	2021-09-08 15:32:35 -07:00
configs.c
context_tracking.c
cpu.c
cpu_pm.c
crash_core.c
crash_dump.c
cred.c
delayacct.c
dma.c
exec_domain.c
exit.c
extable.c
fail_function.c
fork.c	mm/hugetlb: initialize hugetlb_usage in mm_init	2021-09-08 18:45:53 -07:00
freezer.c
futex.c
gen_kheaders.sh
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c
kallsyms.c
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c	kexec: avoid compat_alloc_user_space	2021-09-08 15:32:34 -07:00
kexec_core.c
kexec_elf.c
kexec_file.c
kexec_internal.h
kheaders.c
kmod.c
kprobes.c
ksysfs.c
kthread.c
latencytop.c
Makefile
module-internal.h
module.c
module_signature.c
module_signing.c
notifier.c
nsproxy.c
padata.c
panic.c
params.c
pid.c
pid_namespace.c
profile.c
ptrace.c
range.c
reboot.c
regset.c
relay.c
resource.c
resource_kunit.c
rseq.c
scftorture.c
scs.c
seccomp.c
signal.c
smp.c
smpboot.c
smpboot.h
softirq.c
stackleak.c
stacktrace.c
static_call.c
stop_machine.c
sys.c	Merge branch 'akpm' (patches from Andrew)	2021-09-08 12:55:35 -07:00
sys_ni.c	compat: remove some compat entry points	2021-09-08 15:32:35 -07:00
sysctl-test.c
sysctl.c
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c
up.c
user-return-notifier.c
user.c	fs/epoll: use a per-cpu counter for user's watches count	2021-09-08 11:50:27 -07:00
user_namespace.c
usermode_driver.c
utsname.c
utsname_sysctl.c
watch_queue.c
watchdog.c
watchdog_hld.c
workqueue.c
workqueue_internal.h