Tejun Heo d8ef4b38cb Revert "cgroup: Add memory barriers to plug cgroup_rstat_updated() race window" ... This reverts commit 9a9e97b2f1 ("cgroup: Add memory barriers to plug cgroup_rstat_updated() race window"). The commit was added in anticipation of memcg rstat conversion which needed synchronous accounting for the event counters (e.g. oom kill count). However, the conversion didn't get merged due to percpu memory overhead concern which couldn't be addressed at the time. Unfortunately, the patch's addition of smp_mb() to cgroup_rstat_updated() meant that every scheduling event now had to go through an additional full barrier and Mel Gorman noticed it as 1% regression in netperf UDP_STREAM test. There's no need to have this barrier in tree now and even if we need synchronous accounting in the future, the right thing to do is separating that out to a separate function so that hot paths which don't care about synchronous behavior don't have to pay the overhead of the full barrier. Let's revert. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Mel Gorman <mgorman@techsingularity.net> Link: http://lkml.kernel.org/r/20200409154413.GK3818@techsingularity.net Cc: v4.18+		2020-04-09 14:55:46 -04:00
..
bpf	Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next	2020-03-30 19:52:37 -07:00
cgroup	Revert "cgroup: Add memory barriers to plug cgroup_rstat_updated() race window"	2020-04-09 14:55:46 -04:00
configs	compiler: remove CONFIG_OPTIMIZE_INLINING entirely	2020-04-07 10:43:42 -07:00
debug	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
dma	dma-mapping updates for 5.7	2020-04-04 10:12:47 -07:00
events	mm/vma: replace all remaining open encodings with is_vm_hugetlb_page()	2020-04-07 10:43:37 -07:00
gcov	kernel/gcov/fs.c: replace zero-length array with flexible-array member	2020-04-07 10:43:44 -07:00
irq	x86 entry code updates:	2020-03-30 19:14:28 -07:00
livepatch	New tracing features:	2019-11-27 11:42:01 -08:00
locking	x86 entry code updates:	2020-03-30 19:14:28 -07:00
power	Additional power management updates for 5.7-rc1	2020-04-06 10:14:39 -07:00
printk	console: Introduce ->exit() callback	2020-02-11 10:44:22 +01:00
rcu	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2020-03-30 16:17:15 -07:00
sched	mm/vma: make vma_is_accessible() available for general use	2020-04-07 10:43:37 -07:00
time	hrtimer: Don't dereference the hrtimer pointer after the callback	2020-04-01 13:20:14 +02:00
trace	New tracing features:	2020-04-05 10:36:18 -07:00
.gitignore	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
acct.c	acct: stop using get_seconds()	2019-12-18 18:07:31 +01:00
async.c
audit.c	audit/stable-5.7 PR 20200330	2020-03-31 15:04:17 -07:00
audit.h	audit: trigger accompanying records when no rules present	2020-03-12 10:42:51 -04:00
audit_fsnotify.c	fsnotify: use helpers to access data by data_type	2020-03-23 18:19:06 +01:00
audit_tree.c
audit_watch.c	\n	2020-04-06 08:58:42 -07:00
auditfilter.c	audit: fix error handling in audit_data_to_entry()	2020-02-22 20:36:47 -05:00
auditsc.c	audit: trigger accompanying records when no rules present	2020-03-12 10:42:51 -04:00
backtracetest.c
bounds.c
capability.c
compat.c	y2038: remove unused time32 interfaces	2020-02-21 11:22:15 -08:00
configs.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
context_tracking.c	context-tracking: Introduce CONFIG_HAVE_TIF_NOHZ	2020-02-14 16:05:04 +01:00
cpu.c	CPU (hotplug) updates:	2020-03-30 18:06:39 -07:00
cpu_pm.c
crash_core.c
crash_dump.c
cred.c	kernel: doc: remove outdated comment cred.c	2020-03-25 10:04:01 -05:00
delayacct.c
dma.c
elfcore.c	kernel/elfcore.c: include proper prototypes	2019-09-25 17:51:39 -07:00
exec_domain.c
exit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2020-04-02 11:22:17 -07:00
extable.c	kernel/extable.c: use address-of operator on section symbols	2020-04-07 10:43:42 -07:00
fail_function.c
fork.c	mm: set vm_next and vm_prev to NULL in vm_area_dup()	2020-04-07 10:43:37 -07:00
freezer.c	Revert "libata, freezer: avoid block device removal while system is frozen"	2019-10-06 09:11:37 -06:00
futex.c	Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2020-03-30 16:17:15 -07:00
gen_kheaders.sh	kheaders: explain why include/config/autoconf.h is excluded from md5sum	2019-11-11 20:10:01 +09:00
groups.c
hung_task.c
iomem.c	mm/nvdimm: add is_ioremap_addr and use that to check ioremap address	2019-07-12 11:05:40 -07:00
irq_work.c	lockdep: Annotate irq_work	2020-03-21 16:00:24 +01:00
jump_label.c	jump_label: Don't warn on __exit jump entries	2019-08-29 15:10:10 +01:00
kallsyms.c	kallsyms: unexport kallsyms_lookup_name() and kallsyms_on_each_symbol()	2020-04-07 10:43:44 -07:00
kcmp.c	kernel/kcmp.c: Use new infrastructure to fix deadlocks in execve	2020-03-25 10:04:01 -05:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks	sched/rt, locking: Use CONFIG_PREEMPTION	2019-12-08 14:37:36 +01:00
Kconfig.preempt	sched/Kconfig: Fix spelling mistake in user-visible help text	2019-11-12 11:35:32 +01:00
kcov.c	kcov: remote coverage support	2019-12-04 19:44:14 -08:00
kexec.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec_core.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec_elf.c	kexec_elf: support 32 bit ELF files	2019-09-06 23:58:44 +02:00
kexec_file.c	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kexec_internal.h	kexec: add machine_kexec_post_load()	2020-01-08 16:32:55 +00:00
kheaders.c
kmod.c	kernel/kmod.c: fix a typo "assuems" -> "assumes"	2020-04-07 10:43:44 -07:00
kprobes.c	kprobes: Fix optimize_kprobe()/unoptimize_kprobe() cancellation logic	2020-01-09 12:40:13 +01:00
ksysfs.c
kthread.c	kthread: Do not preempt current task if it is going to call schedule()	2020-03-20 13:06:20 +01:00
latencytop.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
Makefile	kcov: ignore fault-inject and stacktrace	2020-01-31 10:30:41 -08:00
module-internal.h
module.c	proc: faster open/read/close with "permanent" files	2020-04-07 10:43:42 -07:00
module_signature.c	MODSIGN: Export module signature definitions	2019-08-05 18:39:56 -04:00
module_signing.c	MODSIGN: Export module signature definitions	2019-08-05 18:39:56 -04:00
notifier.c	x86/mm: split vmalloc_sync_all()	2020-03-21 18:56:06 -07:00
nsproxy.c	ns: Introduce Time Namespace	2020-01-14 12:20:48 +01:00
padata.c	crypto: pcrypt - simplify error handling in pcrypt_create_aead()	2020-03-06 12:28:24 +11:00
panic.c	locking/refcount: Remove unused 'refcount_error_report()' function	2019-11-25 09:15:42 +01:00
params.c	lockdown: Lock down module params that specify hardware parameters (eg. ioport)	2019-08-19 21:54:16 -07:00
pid.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2020-04-02 11:22:17 -07:00
pid_namespace.c	pid: Improve the comment about waiting in zap_pid_ns_processes	2020-02-28 16:29:12 -06:00
profile.c	proc: convert everything to "struct proc_ops"	2020-02-04 03:05:26 +00:00
ptrace.c	ptrace: reintroduce usage of subjective credentials in ptrace_has_cap()	2020-01-18 13:51:39 +01:00
range.c
reboot.c
relay.c
resource.c	mm/memory_hotplug.c: use PFN_UP / PFN_DOWN in walk_system_ram_range()	2019-09-24 15:54:09 -07:00
rseq.c	rseq: Reject unknown flags on rseq unregister	2019-12-25 10:41:20 +01:00
seccomp.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-03-31 17:29:33 -07:00
signal.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2020-04-02 11:22:17 -07:00
smp.c	cpu/hotplug: Move bringup of secondary CPUs out of smp_init()	2020-03-25 12:59:37 +01:00
smpboot.c
smpboot.h
softirq.c	lockdep: Rename trace_{hard,soft}{irq_context,irqs_enabled}()	2020-03-21 16:03:54 +01:00
stackleak.c
stacktrace.c	stacktrace: Get rid of unneeded '!!' pattern	2019-11-11 10:30:59 +01:00
stop_machine.c	stop_machine: Make stop_cpus() static	2020-01-17 10:19:21 +01:00
sys.c	sys/sysinfo: Respect boottime inside time namespace	2020-03-03 19:34:32 +01:00
sys_ni.c	y2038: allow disabling time32 system calls	2019-11-15 14:38:30 +01:00
sysctl-test.c	kunit: allow kunit tests to be loaded as a module	2020-01-09 16:42:29 -07:00
sysctl.c	mm/compaction: Disable compact_unevictable_allowed on RT	2020-04-02 09:35:31 -07:00
sysctl_binary.c	sysctl: Remove the sysctl system call	2019-11-26 13:03:56 -06:00
task_work.c	task_work_run: don't take ->pi_lock unconditionally	2020-03-02 14:06:33 -07:00
taskstats.c	taskstats: fix data-race	2019-12-04 15:18:39 +01:00
test_kprobes.c
torture.c	CPU (hotplug) updates:	2020-03-30 18:06:39 -07:00
tracepoint.c	The main changes in this release include:	2019-07-18 11:51:00 -07:00
tsacct.c	tsacct: add 64-bit btime field	2019-12-18 18:07:31 +01:00
ucount.c	proc/sysctl: add shared variables for range check	2019-07-18 17:08:07 -07:00
uid16.c
uid16.h
umh.c
up.c	smp/up: Make smp_call_function_single() match SMP semantics	2020-02-07 15:34:12 +01:00
user-return-notifier.c
user.c	Keyrings namespacing	2019-07-08 19:36:47 -07:00
user_namespace.c	Keyrings namespacing	2019-07-08 19:36:47 -07:00
utsname.c
utsname_sysctl.c
watchdog.c	watchdog/softlockup: Enforce that timestamp is valid on boot	2020-01-17 11:19:22 +01:00
watchdog_hld.c
workqueue.c	Merge branch 'for-5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq	2020-04-03 12:27:36 -07:00
workqueue_internal.h