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Linus Torvalds 24ec7504a0 sched/membarrier: reduce the ability to hammer on sys_membarrier 
commit 944d5fe50f3f03daacfea16300e656a1691c4a23 upstream.

On some systems, sys_membarrier can be very expensive, causing overall
slowdowns for everything.  So put a lock on the path in order to
serialize the accesses to prevent the ability for this to be called at
too high of a frequency and saturate the machine.

Reviewed-and-tested-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Fixes: 22e4ebb97582 ("membarrier: Provide expedited private command")
Fixes: c5f58bd58f43 ("membarrier: Provide GLOBAL_EXPEDITED command")
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-02-23 09:12:52 +01:00
..
bpf
bpf: Remove trace_printk_lock
2024-02-23 09:12:51 +01:00
cgroup
cgroup_freezer: cgroup_freezing: Check if not frozen
2023-12-13 18:39:19 +01:00
configs
Kbuild: add Rust support
2022-09-28 09:02:20 +02:00
debug
kdb: Fix a potential buffer overflow in kdb_local()
2024-01-25 15:27:51 -08:00
dma
dma-mapping: clear dev->dma_mem to NULL after freeing it
2024-01-25 15:27:28 -08:00
entry
entry/rcu: Check TIF_RESCHED _after_ delayed RCU wake-up
2023-03-30 12:49:13 +02:00
events
perf: Fix the nr_addr_filters fix
2024-02-05 20:13:00 +00:00
futex
futex: Don't include process MM in futex key on no-MMU
2023-11-20 11:51:50 +01:00
gcov
gcov: add support for checksum field
2022-12-31 13:33:11 +01:00
irq
genirq/affinity: Move group_cpus_evenly() into lib/
2024-01-10 17:10:33 +01:00
kcsan
kcsan: Don't expect 64 bits atomic builtins from 32 bits architectures
2023-07-19 16:21:37 +02:00
livepatch
livepatch: Fix missing newline character in klp_resolve_symbols()
2023-11-20 11:52:10 +01:00
locking
lockdep: Fix block chain corruption
2023-12-03 07:32:09 +01:00
module
kallsyms: Make module_kallsyms_on_each_symbol generally available
2024-01-05 15:18:40 +01:00
power
PM: hibernate: Enforce ordering during image compression/decompression
2024-01-31 16:16:58 -08:00
printk
printk: Consolidate console deferred printing
2023-09-23 11:11:07 +02:00
rcu
rcu: Defer RCU kthreads wakeup when CPU is dying
2024-01-31 16:17:05 -08:00
sched
sched/membarrier: reduce the ability to hammer on sys_membarrier
2024-02-23 09:12:52 +01:00
time
hrtimer: Ignore slack time for RT tasks in schedule_hrtimeout_range()
2024-02-23 09:12:50 +01:00
trace
bpf: Remove trace_printk_lock
2024-02-23 09:12:51 +01:00
.gitignore
…
acct.c
acct: fix potential integer overflow in encode_comp_t()
2022-12-31 13:32:58 +01:00
async.c
async: Introduce async_schedule_dev_nocall()
2024-01-31 16:17:00 -08:00
audit_fsnotify.c
audit: fix potential double free on error path from fsnotify_add_inode_mark
2022-08-22 18:50:06 -04:00
audit_tree.c
…
audit_watch.c
audit: don't WARN_ON_ONCE(!current->mm) in audit_exe_compare()
2023-11-28 17:07:08 +00:00
audit.c
audit: Send netlink ACK before setting connection in auditd_set
2024-02-05 20:12:47 +00:00
audit.h
audit: remove selinux_audit_rule_update() declaration
2022-09-07 11:30:15 -04:00
auditfilter.c
…
auditsc.c
audit,io_uring: io_uring openat triggers audit reference count underflow
2023-10-25 12:03:04 +02:00
backtracetest.c
…
bounds.c
mm: multi-gen LRU: minimal implementation
2022-09-26 19:46:09 -07:00
capability.c
…
cfi.c
cfi: Switch to -fsanitize=kcfi
2022-09-26 10:13:13 -07:00
compat.c
sched_getaffinity: don't assume 'cpumask_size()' is fully initialized
2023-04-06 12:10:40 +02:00
configs.c
…
context_tracking.c
context_tracking: Fix noinstr vs KASAN
2023-03-10 09:33:45 +01:00
cpu_pm.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
cpu.c
cpu/SMT: Make SMT control more robust against enumeration failures
2024-01-10 17:10:26 +01:00
crash_core.c
vmcoreinfo: add kallsyms_num_syms symbol
2022-08-28 14:02:44 -07:00
crash_dump.c
…
cred.c
cred: switch to using atomic_long_t
2023-12-20 17:00:20 +01:00
delayacct.c
delayacct: support re-entrance detection of thrashing accounting
2022-09-26 19:46:07 -07:00
dma.c
…
exec_domain.c
…
exit.c
exit: Detect and fix irq disabled state in oops
2023-03-10 09:33:45 +01:00
extable.c
context_tracking: Take NMI eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
fail_function.c
kernel/fail_function: fix memory leak with using debugfs_lookup()
2023-03-11 13:55:39 +01:00
fork.c
kernel/fork: beware of __put_task_struct() calling context
2023-09-23 11:11:00 +02:00
freezer.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
gen_kheaders.sh
kbuild: build init/built-in.a just once
2022-09-29 04:40:15 +09:00
groups.c
security: Add LSM hook to setgroups() syscall
2022-07-15 18:21:49 +00:00
hung_task.c
sched: Fix more TASK_state comparisons
2022-09-30 16:50:39 +02:00
iomem.c
…
irq_work.c
…
jump_label.c
jump_label: make initial NOP patching the special case
2022-06-24 09:48:55 +02:00
kallsyms_internal.h
kallsyms: Reduce the memory occupied by kallsyms_seqs_of_names[]
2023-10-25 12:03:16 +02:00
kallsyms.c
kallsyms: Add helper kallsyms_on_each_match_symbol()
2023-10-25 12:03:16 +02:00
kcmp.c
…
Kconfig.freezer
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: kmsan: unpoison area->list in kcov_remote_area_put()
2022-10-03 14:03:23 -07:00
kexec_core.c
kexec: fix a memory leak in crash_shrink_memory()
2023-07-19 16:21:08 +02:00
kexec_elf.c
…
kexec_file.c
kexec: support purgatories with .text.hot sections
2023-06-21 16:00:55 +02:00
kexec_internal.h
panic, kexec: make __crash_kexec() NMI safe
2022-09-11 21:55:06 -07:00
kexec.c
kernel: kexec: copy user-array safely
2023-11-28 17:06:57 +00:00
kheaders.c
kheaders: Use array declaration instead of char
2023-05-11 23:03:02 +09:00
kmod.c
…
kprobes.c
kprobes: consistent rcu api usage for kretprobe holder
2023-12-13 18:39:17 +01:00
ksysfs.c
kexec: turn all kexec_mutex acquisitions into trylocks
2022-09-11 21:55:06 -07:00
kthread.c
signal: break out of wait loops on kthread_stop()
2022-10-09 16:01:59 -07:00
latencytop.c
latencytop: use the last element of latency_record of system
2022-09-11 21:55:12 -07:00
Makefile
cfi: Fix CFI failure with KASAN
2022-12-31 13:33:08 +01:00
module_signature.c
…
notifier.c
…
nsproxy.c
Revert "fs/exec: allow to unshare a time namespace on vfork+exec"
2022-09-13 10:38:43 -07:00
padata.c
crypto: pcrypt - Fix hungtask for PADATA_RESET
2023-11-28 17:06:58 +00:00
panic.c
panic: Reenable preemption in WARN slowpath
2023-09-23 11:11:09 +02:00
params.c
…
pid_namespace.c
rcu-tasks: Fix synchronize_rcu_tasks() VS zap_pid_ns_processes()
2023-03-10 09:32:52 +01:00
pid.c
gfs2: Add glockfd debugfs file
2022-06-29 13:07:16 +02:00
profile.c
kernel/profile.c: simplify duplicated code in profile_setup()
2022-09-11 21:55:12 -07:00
ptrace.c
freezer,sched: Rewrite core freezer logic
2022-09-07 21:53:50 +02:00
range.c
…
reboot.c
kernel/reboot: emergency_restart: Set correct system_state
2023-11-28 17:07:13 +00:00
regset.c
…
relay.c
relayfs: fix out-of-bounds access in relay_file_read
2023-05-11 23:03:03 +09:00
resource_kunit.c
…
resource.c
PCI: Allow drivers to request exclusive config regions
2023-09-13 09:42:46 +02:00
rseq.c
rseq: Use pr_warn_once() when deprecated/unknown ABI flags are encountered
2022-11-14 09:58:32 +01:00
scftorture.c
scftorture: Forgive memory-allocation failure if KASAN
2023-09-23 11:11:00 +02:00
scs.c
…
seccomp.c
…
signal.c
mm: suppress mm fault logging if fatal signal already pending
2023-08-03 10:24:01 +02:00
smp.c
smp,csd: Throw an error if a CSD lock is stuck for too long
2023-11-28 17:06:55 +00:00
smpboot.c
smpboot: use atomic_try_cmpxchg in cpu_wait_death and cpu_report_death
2022-09-11 21:55:10 -07:00
smpboot.h
…
softirq.c
context_tracking: Take IRQ eqs entrypoints over RCU
2022-07-05 13:32:59 -07:00
stackleak.c
…
stacktrace.c
…
static_call_inline.c
…
static_call.c
…
stop_machine.c
…
sys_ni.c
kernel/sys_ni: add compat entry for fadvise64_64
2022-08-20 15:17:45 -07:00
sys.c
kernel/sys.c: fix and improve control flow in __sys_setres[ug]id()
2023-04-26 14:28:39 +02:00
sysctl-test.c
kernel/sysctl-test: use SYSCTL_{ZERO/ONE_HUNDRED} instead of i_{zero/one_hundred}
2022-09-08 16:56:45 -07:00
sysctl.c
proc: proc_skip_spaces() shouldn't think it is working on C strings
2022-12-05 12:09:06 -08:00
task_work.c
task_work: use try_cmpxchg in task_work_add, task_work_cancel_match and task_work_run
2022-09-11 21:55:10 -07:00
taskstats.c
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
torture.c
torture: Fix hang during kthread shutdown phase
2023-03-10 09:34:07 +01:00
tracepoint.c
tracepoint: Optimize the critical region of mutex_lock in tracepoint_module_coming()
2022-09-26 13:01:18 -04:00
tsacct.c
…
ucount.c
…
uid16.c
…
uid16.h
…
umh.c
freezer,umh: Fix call_usermode_helper_exec() vs SIGKILL
2023-02-22 12:59:50 +01:00
up.c
…
user_namespace.c
ucounts: Split rlimit and ucount values and max values
2022-10-09 16:24:05 -07:00
user-return-notifier.c
…
user.c
…
usermode_driver.c
…
utsname_sysctl.c
kernel/utsname_sysctl.c: Fix hostname polling
2022-10-23 12:01:01 -07:00
utsname.c
…
watch_queue.c
kernel: watch_queue: copy user-array safely
2023-11-28 17:06:57 +00:00
watchdog_hld.c
watchdog/perf: more properly prevent false positives with turbo modes
2023-07-19 16:21:08 +02:00
watchdog.c
watchdog: move softlockup_panic back to early_param
2023-11-28 17:07:09 +00:00
workqueue_internal.h
…
workqueue.c
workqueue: Provide one lock class key per work_on_cpu() callsite
2023-11-28 17:06:55 +00:00