Changbin Du b8582c0f79 tracing: Allocate mask_str buffer dynamically ...

commit 90e406f96f630c07d631a021fd4af10aac913e77 upstream.

The default NR_CPUS can be very large, but actual possible nr_cpu_ids
usually is very small. For my x86 distribution, the NR_CPUS is 8192 and
nr_cpu_ids is 4. About 2 pages are wasted.

Most machines don't have so many CPUs, so define a array with NR_CPUS
just wastes memory. So let's allocate the buffer dynamically when need.

With this change, the mutext tracing_cpumask_update_lock also can be
removed now, which was used to protect mask_str.

Link: http://lkml.kernel.org/r/1512013183-19107-1-git-send-email-changbin.du@intel.com

Fixes: 36dfe9252bd4c ("ftrace: make use of tracing_cpumask")
Signed-off-by: Changbin Du <changbin.du@intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2017-12-20 10:10:18 +01:00

..

bpf

bpf: fix lockdep splat

2017-12-14 09:53:11 +01:00

cgroup

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

configs

ANDROID: binder: add hwbinder,vndbinder to BINDER_DEVICES.

2017-08-22 18:43:23 -07:00

debug

kdb: Fix handling of kallsyms_symbol_next() return value

2017-12-14 09:52:58 +01:00

events

perf/core: Fix __perf_read_group_add() locking

2017-12-10 13:40:40 +01:00

gcov

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

irq

genirq: Track whether the trigger type has been set

2017-11-30 08:40:52 +00:00

livepatch

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

locking

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

power

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

printk

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

rcu

rcu: Fix up pending cbs check in rcu_prepare_for_idle

2017-11-24 08:37:04 +01:00

sched

sched/rt: Simplify the IPI based RT balancing logic

2017-11-30 08:40:43 +00:00

time

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

trace

tracing: Allocate mask_str buffer dynamically

2017-12-20 10:10:18 +01:00

.gitignore

…

acct.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

async.c

async: Adjust system_state checks

2017-05-23 10:01:37 +02:00

audit_fsnotify.c

Merge branch 'fsnotify' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs

2017-05-03 11:05:15 -07:00

audit_tree.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

audit_watch.c

audit/stable-4.13 PR 20170816

2017-08-16 16:48:34 -07:00

audit.c

audit: ensure that 'audit=1' actually enables audit for PID 1

2017-12-17 15:08:00 +01:00

audit.h

ipc: mqueue: Replace timespec with timespec64

2017-09-03 20:21:24 -04:00

auditfilter.c

audit: kernel generated netlink traffic should have a portid of 0

2017-05-02 10:16:05 -04:00

auditsc.c

Merge branch 'work.ipc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2017-09-14 17:37:26 -07:00

backtracetest.c

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bounds.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

capability.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

compat.c

semtimedop(): move compat to native

2017-07-15 20:46:47 -04:00

configs.c

…

context_tracking.c

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cpu_pm.c

PM / CPU: replace raw_notifier with atomic_notifier

2017-07-31 13:09:49 +02:00

cpu.c

smp/hotplug: Move step CPUHP_AP_SMPCFD_DYING to the correct place

2017-12-14 09:52:56 +01:00

crash_core.c

kdump: protect vmcoreinfo data under the crash memory

2017-07-12 16:26:00 -07:00

crash_dump.c

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cred.c

doc: ReSTify credentials.txt

2017-05-18 10:30:19 -06:00

delayacct.c

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dma.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

elfcore.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

exec_domain.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

exit.c

waitid(): Avoid unbalanced user_access_end() on access_ok() error

2017-10-20 15:32:54 -04:00

extable.c

extable: Enable RCU if it is not watching in kernel_text_address()

2017-09-23 16:50:20 -04:00

fork.c

kmemleak: clear stale pointers from task stacks

2017-10-13 16:18:33 -07:00

freezer.c

…

futex_compat.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

futex.c

Merge branch 'linus' into core/urgent, to pick up dependent commits

2017-11-04 08:53:04 +01:00

groups.c

kernel: make groups_sort calling a responsibility group_info allocators

2017-12-20 10:10:18 +01:00

hung_task.c

kernel/hung_task.c: defer showing held locks

2017-05-08 17:15:10 -07:00

irq_work.c

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jump_label.c

jump_label: Invoke jump_label_test() via early_initcall()

2017-12-14 09:53:13 +01:00

kallsyms.c

kernel/kallsyms.c: replace all_var with IS_ENABLED(CONFIG_KALLSYMS_ALL)

2017-07-10 16:32:34 -07:00

kcmp.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

Kconfig.freezer

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Kconfig.hz

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Kconfig.locks

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Kconfig.preempt

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kcov.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

kexec_core.c

x86/mm, kexec: Allow kexec to be used with SME

2017-07-18 11:38:04 +02:00

kexec_file.c

kexec_file: adjust declaration of kexec_purgatory

2017-07-12 16:26:02 -07:00

kexec_internal.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

kexec.c

kdump: protect vmcoreinfo data under the crash memory

2017-07-12 16:26:00 -07:00

kmod.c

kmod: move #ifdef CONFIG_MODULES wrapper to Makefile

2017-09-08 18:26:51 -07:00

kprobes.c

kprobes: Use synchronize_rcu_tasks() for optprobe with CONFIG_PREEMPT=y

2017-12-10 13:40:40 +01:00

ksysfs.c

kexec: move vmcoreinfo out of the kernel's .bss section

2017-07-12 16:25:59 -07:00

kthread.c

kernel/kthread.c: kthread_worker: don't hog the cpu

2017-08-31 16:33:15 -07:00

latencytop.c

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Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

memremap.c

memremap: add scheduling point to devm_memremap_pages

2017-10-03 17:54:25 -07:00

module_signing.c

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module-internal.h

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module.c

module: fix ddebug_remove_module()

2017-07-25 15:08:32 +02:00

notifier.c

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nsproxy.c

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padata.c

padata: Avoid nested calls to cpus_read_lock() in pcrypt_init_padata()

2017-05-26 10:10:37 +02:00

panic.c

locking/refcounts, x86/asm: Implement fast refcount overflow protection

2017-08-17 10:40:26 +02:00

params.c

kernel/params.c: improve STANDARD_PARAM_DEF readability

2017-10-03 17:54:26 -07:00

pid_namespace.c

userns,pidns: Verify the userns for new pid namespaces

2017-07-20 07:43:58 -05:00

pid.c

pids: make task_tgid_nr_ns() safe

2017-08-21 12:47:31 -07:00

profile.c

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ptrace.c

signal: Remove kernel interal si_code magic

2017-07-24 14:30:28 -05:00

range.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

reboot.c

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relay.c

Merge branch 'work.splice' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

2017-05-02 11:38:06 -07:00

resource.c

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seccomp.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

signal.c

signal: Fix name of SIGEMT in #if defined() check

2017-11-01 17:04:57 -05:00

smp.c

treewide: make "nr_cpu_ids" unsigned

2017-09-08 18:26:48 -07:00

smpboot.c

watchdog/core, powerpc: Lock cpus across reconfiguration

2017-10-04 10:53:54 +02:00

smpboot.h

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

softirq.c

sched/core: Remove 'task' parameter and rename tsk_restore_flags() to current_restore_flags()

2017-04-11 09:06:32 +02:00

stacktrace.c

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stop_machine.c

stop_machine: Provide stop_machine_cpuslocked()

2017-05-26 10:10:36 +02:00

sys_ni.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

sys.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

sysctl_binary.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

sysctl.c

pipe: match pipe_max_size data type with procfs

2017-12-14 09:53:08 +01:00

task_work.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

taskstats.c

taskstats: add e/u/stime for TGID command

2017-05-08 17:15:12 -07:00

test_kprobes.c

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torture.c

torture: Fix typo suppressing CPU-hotplug statistics

2017-07-25 13:04:45 -07:00

tracepoint.c

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tsacct.c

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ucount.c

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uid16.c

kernel: make groups_sort calling a responsibility group_info allocators

2017-12-20 10:10:18 +01:00

umh.c

kmod: split out umh code into its own file

2017-09-08 18:26:50 -07:00

up.c

smp: Avoid using two cache lines for struct call_single_data

2017-08-29 15:14:38 +02:00

user_namespace.c

userns,pidns: Verify the userns for new pid namespaces

2017-07-20 07:43:58 -05:00

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_hld.c

Merge branch 'linus' into core/urgent, to pick up dependent commits

2017-11-04 08:53:04 +01:00

watchdog.c

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

workqueue_internal.h

Merge branch 'for-4.14-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq

2017-11-06 12:26:49 -08:00

workqueue.c

workqueue: replace pool->manager_arb mutex with a flag

2017-10-10 07:13:57 -07:00