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linux/arch/s390/kernel
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Peter Zijlstra (Intel) e9d867a67f sched: Allow per-cpu kernel threads to run on online && !active 
In order to enable symmetric hotplug, we must mirror the online &&
!active state of cpu-down on the cpu-up side.

However, to retain sanity, limit this state to per-cpu kthreads.

Aside from the change to set_cpus_allowed_ptr(), which allow moving
the per-cpu kthreads on, the other critical piece is the cpu selection
for pinned tasks in select_task_rq(). This avoids dropping into
select_fallback_rq().

select_fallback_rq() cannot be allowed to select !active cpus because
its used to migrate user tasks away. And we do not want to move user
tasks onto cpus that are in transition.

Requested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Jan H. Schönherr <jschoenh@amazon.de>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160301152303.GV6356@twins.programming.kicks-ass.net
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-05-06 14:58:22 +02:00
..
vdso32 s390/vdso: optimize getcpu system call 2016-01-11 13:01:24 +01:00
vdso64 s390/vdso: optimize getcpu system call 2016-01-11 13:01:24 +01:00
.gitignore s390: add various .gitignore files. 2012-05-16 14:42:41 +02:00
asm-offsets.c s390/mm: split arch/s390/mm/pgtable.c 2016-03-08 15:00:15 +01:00
audit.c
audit.h
base.S s390/kdump: fix nosmt kernel parameter 2015-06-25 09:39:26 +02:00
cache.c s390/cachinfo: add missing facility check to init_cache_level() 2015-07-28 08:54:42 +02:00
compat_audit.c
compat_linux.c groups: Consolidate the setgroups permission checks 2014-12-05 17:19:27 -06:00
compat_linux.h s390: add support for vector extension 2014-10-09 09:14:13 +02:00
compat_ptrace.h
compat_signal.c s390/compat: correct restore of high gprs on signal return 2016-02-22 09:29:35 +01:00
compat_wrapper.c s390: wire up copy_file_range syscall 2016-01-19 12:14:02 +01:00
cpcmd.c s390: Use pr_warn instead of pr_warning 2016-03-07 13:12:04 +01:00
crash_dump.c s390: remove superfluous memblock_alloc() return value checks 2016-01-19 12:14:02 +01:00
debug.c s390: Use pr_warn instead of pr_warning 2016-03-07 13:12:04 +01:00
diag.c s390/diag: add a s390 prefix to the diagnose trace point 2015-11-09 09:10:47 +01:00
dis.c s390/dis: use correct escape sequence for '%' character 2016-03-02 06:44:25 -06:00
dumpstack.c Merge branch 'akpm' (patches from Andrew) 2016-03-16 11:51:08 -07:00
early.c locking/lockdep: Eliminate lockdep_init() 2016-02-09 12:03:25 +01:00
ebcdic.c s390/comments: unify copyright messages and remove file names 2012-07-20 11:15:04 +02:00
entry.h s390/udelay: make udelay have busy loop semantics 2015-10-14 14:32:13 +02:00
entry.S s390: fix floating pointer register corruption (again) 2016-03-10 14:35:42 +01:00
ftrace.c s390: remove all usages of PSW_ADDR_INSN 2016-01-19 12:14:03 +01:00
head64.S s390/cpumf: Fix lpp detection 2016-03-08 10:38:06 +01:00
head_kdump.S s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
head.S s390/facilities: make use of generated facility list 2015-12-18 14:59:21 +01:00
idle.c s390/idle: convert open coded idle time seqcount 2014-12-08 09:42:32 +01:00
ipl.c s390: remove all usages of PSW_ADDR_AMODE 2016-01-19 12:14:02 +01:00
irq.c s390: add current_stack_pointer() helper function 2016-02-23 08:56:18 +01:00
jump_label.c Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-03 15:46:07 -07:00
kprobes.c s390: remove all usages of PSW_ADDR_INSN 2016-01-19 12:14:03 +01:00
lgr.c s390/sysinfo,stsi: change return code handling 2012-09-26 15:45:12 +02:00
machine_kexec.c s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
Makefile s390: get rid of CONFIG_SCHED_MC and CONFIG_SCHED_BOOK 2015-12-30 10:34:57 +01:00
mcount.S s390/ftrace: hotpatch support for function tracing 2015-01-29 09:19:25 +01:00
module.c module: use a structure to encapsulate layout. 2015-12-04 22:46:25 +01:00
nmi.c s390/nmi: reduce size of percpu variable 2015-10-27 09:33:57 +01:00
os_info.c s390/dump: streamline oldmem copy functions 2015-11-27 09:24:12 +01:00
perf_cpum_cf_events.c s390/cpum_cf: Export event names in sysfs 2013-12-16 14:37:50 +01:00
perf_cpum_cf.c s390/cpum_cf: Fix missing cpu hotplug notifier transition 2016-03-17 13:18:24 +01:00
perf_cpum_sf.c s390/cpum_sf: Fix cpu hotplug notifier transitions 2016-03-17 13:18:24 +01:00
perf_event.c s390: Fix misspellings in comments 2016-03-08 15:00:17 +01:00
pgm_check.S s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
process.c s390: remove all usages of PSW_ADDR_INSN 2016-01-19 12:14:03 +01:00
processor.c s390: show virtualization support in /proc/cpuinfo 2015-11-30 12:47:11 +01:00
ptrace.c s390: remove all usages of PSW_ADDR_INSN 2016-01-19 12:14:03 +01:00
reipl.S s390/dump: rework CPU register dump code 2015-11-27 09:24:14 +01:00
relocate_kernel.S s390: remove "64" suffix from a couple of files 2015-03-25 11:49:34 +01:00
runtime_instr.c s390: remove runtime instrumentation interrupts 2015-11-03 14:40:51 +01:00
s390_ksyms.c s390/fpu: split fpu-internal.h into fpu internals, api, and type headers 2015-10-16 09:41:12 +02:00
sclp.c s390/sclp: Add VT220 support to early sclp console 2015-11-27 09:24:17 +01:00
setup.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux 2016-03-16 10:47:45 -07:00
signal.c s390: remove all usages of PSW_ADDR_AMODE 2016-01-19 12:14:02 +01:00
smp.c sched: Allow per-cpu kernel threads to run on online && !active 2016-05-06 14:58:22 +02:00
stacktrace.c s390/dumpstack: merge all four stack tracers 2016-02-23 08:56:20 +01:00
suspend.c PCI: Include <linux/pci.h>, not <asm/pci.h> 2015-06-08 07:55:03 -05:00
swsusp.S s390/hibernate: fix save and restore of vector registers 2015-09-17 13:43:41 +02:00
sys_s390.c s390: remove 31 bit support 2015-03-25 11:49:33 +01:00
syscalls.S s390: wire up preadv2/pwritev2 syscalls 2016-04-01 08:42:38 +02:00
sysinfo.c s390/sysinfo: add missing SYSIB 1.2.2 multithreading fields 2016-01-11 12:27:00 +01:00
time.c param: convert some "on"/"off" users to strtobool 2016-03-17 15:09:34 -07:00
topology.c param: convert some "on"/"off" users to strtobool 2016-03-17 15:09:34 -07:00
trace.c s390/diag: avoid lockdep recursion 2016-02-11 13:05:56 +01:00
traps.c s390/fault: merge report_user_fault implementations 2016-03-02 06:44:27 -06:00
uprobes.c s390/uprobes: fix address space annotation 2015-03-25 11:49:47 +01:00
vdso.c s390/vdso: optimize getcpu system call 2016-01-11 13:01:24 +01:00
vmlinux.lds.S arch, ftrace: for KASAN put hard/soft IRQ entries into separate sections 2016-03-25 16:37:42 -07:00
vtime.c s390/vtime: correct scaled cputime of partially idle CPUs 2015-09-30 16:22:38 +02:00