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Cheng Jian 7308b7bd67 sched/fair: Optimize select_idle_cpu 
commit 60588bfa22 upstream.

select_idle_cpu() will scan the LLC domain for idle CPUs,
it's always expensive. so the next commit :

	1ad3aaf3fc ("sched/core: Implement new approach to scale select_idle_cpu()")

introduces a way to limit how many CPUs we scan.

But it consume some CPUs out of 'nr' that are not allowed
for the task and thus waste our attempts. The function
always return nr_cpumask_bits, and we can't find a CPU
which our task is allowed to run.

Cpumask may be too big, similar to select_idle_core(), use
per_cpu_ptr 'select_idle_mask' to prevent stack overflow.

Fixes: 1ad3aaf3fc ("sched/core: Implement new approach to scale select_idle_cpu()")
Signed-off-by: Cheng Jian <cj.chengjian@huawei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20191213024530.28052-1-cj.chengjian@huawei.com
Signed-off-by: Yang Wei <yang.wei@linux.alibaba.com>
Tested-by: Yang Wei <yang.wei@linux.alibaba.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-06-10 12:43:53 +02:00
..
bpf
bpf: No need to simulate speculative domain for immediates
2021-06-10 12:43:53 +02:00
cgroup
cgroup: add missing skcd->no_refcnt check in cgroup_sk_clone()
2020-08-21 09:48:02 +02:00
configs
…
debug
kdb: Make memory allocations more robust
2021-03-03 18:22:36 +01:00
events
perf/core: Fix race in the perf_mmap_close() function
2020-11-18 18:28:02 +01:00
gcov
gcov: add support for GCC 10.1
2020-09-23 10:46:32 +02:00
irq
genirq: Disable interrupts for force threaded handlers
2021-03-24 11:05:06 +01:00
livepatch
livepatch: Nullify obj->mod in klp_module_coming()'s error path
2019-10-07 18:55:09 +02:00
locking
rtmutex: Remove unused argument from rt_mutex_proxy_unlock()
2021-01-30 13:31:16 +01:00
power
PM: hibernate: remove the bogus call to get_gendisk() in software_resume()
2020-10-29 09:07:16 +01:00
printk
printk: fix deadlock when kernel panic
2021-03-03 18:22:55 +01:00
rcu
rcuperf: Fix cleanup path for invalid perf_type strings
2019-05-31 06:47:33 -07:00
sched
sched/fair: Optimize select_idle_cpu
2021-06-10 12:43:53 +02:00
time
posix-timers: Preserve return value in clock_adjtime32()
2021-05-22 10:57:22 +02:00
trace
tracing: Restructure trace_clock_global() to never block
2021-05-22 10:57:25 +02:00
.gitignore
…
acct.c
kernel/acct.c: fix the acct->needcheck check in check_free_space()
2018-01-10 09:31:17 +01:00
async.c
kernel/async.c: revert "async: simplify lowest_in_progress()"
2018-02-16 20:23:05 +01:00
audit_fsnotify.c
…
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: CONFIG_CHANGE don't log internal bookkeeping as an event
2020-10-01 13:12:33 +02:00
audit.c
audit: fix a net reference leak in audit_list_rules_send()
2020-06-20 10:25:10 +02:00
audit.h
audit: fix a net reference leak in audit_list_rules_send()
2020-06-20 10:25:10 +02:00
auditfilter.c
audit: fix a net reference leak in audit_list_rules_send()
2020-06-20 10:25:10 +02:00
auditsc.c
audit: print empty EXECVE args
2019-12-01 09:14:03 +01:00
backtracetest.c
…
bounds.c
kbuild: fix kernel/bounds.c 'W=1' warning
2018-11-13 11:15:08 -08:00
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
make 'user_access_begin()' do 'access_ok()'
2020-06-20 10:24:58 +02:00
configs.c
…
context_tracking.c
…
cpu_pm.c
kernel/cpu_pm: Fix uninitted local in cpu_pm
2020-06-20 10:25:19 +02:00
cpu.c
kernel/cpu: add arch override for clear_tasks_mm_cpumask() mm handling
2020-12-29 13:46:47 +01:00
crash_core.c
kdump: write correct address of mem_section into vmcoreinfo
2018-01-17 09:45:27 +01:00
crash_dump.c
…
cred.c
memcg: account security cred as well to kmemcg
2020-01-09 10:17:54 +01:00
delayacct.c
delayacct: Use raw_spinlocks
2018-08-03 07:50:38 +02:00
dma.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
don't dump the threads that had been already exiting when zapped.
2020-11-18 18:27:58 +01:00
extable.c
extable: Enable RCU if it is not watching in kernel_text_address()
2017-09-23 16:50:20 -04:00
fork.c
fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent
2020-11-10 10:29:06 +01:00
freezer.c
…
futex.c
Revert 337f13046f ("futex: Allow FUTEX_CLOCK_REALTIME with FUTEX_WAIT op")
2021-05-22 10:57:22 +02:00
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: disable on suspend
2019-04-20 09:15:05 +02:00
irq_work.c
…
jump_label.c
sched/core: Fix cpu.max vs. cpuhotplug deadlock
2018-12-05 19:41:17 +01:00
kallsyms.c
kallsyms: Don't let kallsyms_lookup_size_offset() fail on retrieving the first symbol
2019-09-21 07:15:38 +02:00
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
…
Kconfig.hz
…
Kconfig.locks
…
Kconfig.preempt
…
kcov.c
kcov: ensure irq code sees a valid area
2018-08-03 07:50:22 +02:00
kexec_core.c
kexec: Allocate decrypted control pages for kdump if SME is enabled
2019-11-24 08:23:15 +01:00
kexec_file.c
kernel: kexec_file: fix error return code of kexec_calculate_store_digests()
2021-05-22 10:57:39 +02:00
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
…
kmod.c
kmod: make request_module() return an error when autoloading is disabled
2020-04-24 08:00:44 +02:00
kprobes.c
kretprobe: Avoid re-registration of the same kretprobe earlier
2021-02-10 09:12:09 +01:00
ksysfs.c
…
kthread.c
kthread: Extract KTHREAD_IS_PER_CPU
2021-02-07 14:47:41 +01:00
latencytop.c
…
Makefile
elfcore: fix building with clang
2021-02-10 09:12:08 +01:00
memremap.c
mm, devm_memremap_pages: kill mapping "System RAM" support
2019-01-13 10:01:02 +01:00
module_signing.c
…
module-internal.h
…
module.c
modules: inherit TAINT_PROPRIETARY_MODULE
2021-05-22 10:57:24 +02:00
notifier.c
x86/mm: split vmalloc_sync_all()
2020-04-02 16:34:20 +02:00
nsproxy.c
…
padata.c
padata: purge get_cpu and reorder_via_wq from padata_do_serial
2020-05-27 16:43:05 +02:00
panic.c
panic: ensure preemption is disabled during panic()
2019-10-17 13:43:19 -07:00
params.c
kernel/params.c: improve STANDARD_PARAM_DEF readability
2017-10-03 17:54:26 -07:00
pid_namespace.c
signal/pid_namespace: Fix reboot_pid_ns to use send_sig not force_sig
2019-07-31 07:28:21 +02:00
pid.c
…
profile.c
…
ptrace.c
ptrace: make ptrace() fail if the tracee changed its pid unexpectedly
2021-05-26 11:46:58 +02:00
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
reboot: fix overflow parsing reboot cpu number
2020-11-18 18:28:02 +01:00
relay.c
kernel/relay.c: fix memleak on destroy relay channel
2020-08-26 10:29:54 +02:00
resource.c
resource: fix integer overflow at reallocation
2018-04-24 09:36:22 +02:00
seccomp.c
seccomp: Add missing return in non-void function
2021-03-03 18:22:53 +01:00
signal.c
signal: Extend exec_id to 64bits
2020-04-24 08:00:38 +02:00
smp.c
smp: Fix smp_call_function_single_async prototype
2021-05-22 10:57:35 +02:00
smpboot.c
kthread: Extract KTHREAD_IS_PER_CPU
2021-02-07 14:47:41 +01:00
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
Mark HI and TASKLET softirq synchronous
2018-08-15 18:12:47 +02:00
stacktrace.c
…
stop_machine.c
stop_machine: Atomically queue and wake stopper threads
2018-09-05 09:26:36 +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
kernel/sys.c: avoid copying possible padding bytes in copy_to_user
2020-10-01 13:12:30 +02:00
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
kernel: sysctl: make drop_caches write-only
2020-01-04 13:59:57 +01:00
task_work.c
locking/barriers: Convert users of lockless_dereference() to READ_ONCE()
2017-12-25 14:26:21 +01:00
taskstats.c
taskstats: fix data-race
2020-01-09 10:17:53 +01:00
test_kprobes.c
…
torture.c
…
tracepoint.c
tracepoint: Do not fail unregistering a probe due to memory failure
2021-03-03 18:22:47 +01:00
tsacct.c
…
ucount.c
…
uid16.c
kernel: make groups_sort calling a responsibility group_info allocators
2017-12-20 10:10:18 +01:00
umh.c
usermodehelper: reset umask to default before executing user process
2020-10-14 09:51:10 +02:00
up.c
smp: Fix smp_call_function_single_async prototype
2021-05-22 10:57:35 +02:00
user_namespace.c
userns: move user access out of the mutex
2018-09-09 19:56:00 +02:00
user-return-notifier.c
…
user.c
…
utsname_sysctl.c
sys: don't hold uts_sem while accessing userspace memory
2018-09-09 19:56:00 +02:00
utsname.c
…
watchdog_hld.c
watchdog: Mark watchdog touch functions as notrace
2018-09-05 09:26:42 +02:00
watchdog.c
watchdog/softlockup: Enforce that timestamp is valid on boot
2020-02-28 16:36:05 +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: Move the position of debug_work_activate() in __queue_work()
2021-04-16 11:57:50 +02:00