Tejun Heo 3fc1f1e27a stop_machine: reimplement using cpu_stop ... Reimplement stop_machine using cpu_stop. As cpu stoppers are guaranteed to be available for all online cpus, stop_machine_create/destroy() are no longer necessary and removed. With resource management and synchronization handled by cpu_stop, the new implementation is much simpler. Asking the cpu_stop to execute the stop_cpu() state machine on all online cpus with cpu hotplug disabled is enough. stop_machine itself doesn't need to manage any global resources anymore, so all per-instance information is rolled into struct stop_machine_data and the mutex and all static data variables are removed. The previous implementation created and destroyed RT workqueues as necessary which made stop_machine() calls highly expensive on very large machines. According to Dimitri Sivanich, preventing the dynamic creation/destruction makes booting faster more than twice on very large machines. cpu_stop resources are preallocated for all online cpus and should have the same effect. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Rusty Russell <rusty@rustcorp.com.au> Acked-by: Peter Zijlstra <peterz@infradead.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Dimitri Sivanich <sivanich@sgi.com>		2010-05-06 18:49:20 +02:00
..
vdso32	Use macros for .data.page_aligned section.	2009-09-21 06:27:08 +02:00
vdso64	Use macros for .data.page_aligned section.	2009-09-21 06:27:08 +02:00
asm-offsets.c	[S390] Cleanup struct _lowcore usage and defines.	2010-02-26 22:37:31 +01:00
audit.c	[S390] Get rid of a bunch of sparse warnings again.	2007-10-12 16:13:06 +02:00
audit.h	[S390] Get rid of a bunch of sparse warnings again.	2007-10-12 16:13:06 +02:00
base.S	[S390] Cleanup struct _lowcore usage and defines.	2010-02-26 22:37:31 +01:00
bitmap.c	[S390] move EXPORT_SYMBOLs to definitions	2009-03-26 15:24:11 +01:00
compat_audit.c	[S390] Get rid of a bunch of sparse warnings again.	2007-10-12 16:13:06 +02:00
compat_exec_domain.c
compat_linux.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
compat_linux.h	Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6	2009-12-09 19:01:47 -08:00
compat_ptrace.h	[S390] Expose a constant for the number of words representing the CRs	2009-03-26 15:24:25 +01:00
compat_signal.c	[S390] 64-bit register support for 31-bit processes	2009-10-06 10:35:10 +02:00
compat_wrapper.S	improve sys_newuname() for compat architectures	2010-03-12 15:52:32 -08:00
cpcmd.c	[S390] convert cpcmd printks to pr_xxx macros.	2008-12-25 13:39:19 +01:00
crash.c
debug.c	tree-wide: convert open calls to remove spaces to skip_spaces() lib function	2009-12-15 08:53:32 -08:00
diag.c
dis.c	[S390] add z9-ec/z10 instruction to kernel disassembler	2010-02-26 22:37:32 +01:00
early.c	[S390] nss: add missing .previous statement to asm function	2010-04-09 13:43:02 +02:00
ebcdic.c
entry64.S	[S390] fix io_return critical section cleanup	2010-04-09 13:43:02 +02:00
entry.h	improve sys_newuname() for compat architectures	2010-03-12 15:52:32 -08:00
entry.S	[S390] fix io_return critical section cleanup	2010-04-09 13:43:02 +02:00
ftrace.c	Merge branch 'tracing-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2010-02-28 10:17:55 -08:00
head31.S	[S390] add support for compressed kernels	2010-02-26 22:37:33 +01:00
head64.S	[S390] fix boot failures with compressed kernels	2010-03-24 11:49:54 +01:00
head.S	[S390] fix boot failures with compressed kernels	2010-03-24 11:49:54 +01:00
init_task.c	Use new __init_task_data macro in arch init_task.c files.	2009-09-21 06:27:08 +02:00
ipl.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
irq.c	[S390] Fix init irq proc build break.	2009-02-11 10:37:39 +01:00
kprobes.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
machine_kexec.c	[S390] smp: always reboot on cpu 0	2010-02-26 22:37:30 +01:00
Makefile	[S390] add support for compressed kernels	2010-02-26 22:37:33 +01:00
mcount64.S	[S390] improve mcount code	2009-09-11 10:29:43 +02:00
mcount.S	[S390] improve mcount code	2009-09-11 10:29:43 +02:00
mem_detect.c	[S390] s390: hibernation support for s390	2009-06-16 10:31:22 +02:00
module.c	[S390] module: fix memory leak in s390 module loader	2009-10-06 10:35:06 +02:00
nmi.c	[S390] merge cpu.h into cputime.h	2009-06-12 10:27:29 +02:00
process.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
processor.c	[S390] Add highgprs facility to /proc/cpuinfo	2009-10-14 12:43:53 +02:00
ptrace.c	Merge branch 'tracing/core' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing into tracing/core	2010-02-27 10:06:10 +01:00
reipl64.S	[S390] Cleanup struct _lowcore usage and defines.	2010-02-26 22:37:31 +01:00
reipl.S	[S390] Cleanup struct _lowcore usage and defines.	2010-02-26 22:37:31 +01:00
relocate_kernel64.S
relocate_kernel.S
s390_ext.c	nohz: Introduce arch_needs_cpu	2009-11-05 07:53:53 +01:00
s390_ksyms.c	[S390] move EXPORT_SYMBOLs to definitions	2009-03-26 15:24:11 +01:00
sclp.S	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
setup.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
signal.c	[S390] use set_current_state in sigsuspend	2010-01-27 10:12:49 +01:00
smp.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
stacktrace.c	[S390] Fix stacktrace compile bug.	2008-07-17 17:22:09 +02:00
suspend.c	[S390] hibernate: make sure pfn_is_nosave handles lowcore pages	2009-09-22 22:58:45 +02:00
switch_cpu64.S	[S390] Cleanup struct _lowcore usage and defines.	2010-02-26 22:37:31 +01:00
switch_cpu.S	[S390] Cleanup struct _lowcore usage and defines.	2010-02-26 22:37:31 +01:00
swsusp_asm64.S	[S390] smp: rename and add lowcore defines	2010-02-26 22:37:30 +01:00
sys_s390.c	improve sys_newuname() for compat architectures	2010-03-12 15:52:32 -08:00
syscalls.S	improve sys_newuname() for compat architectures	2010-03-12 15:52:32 -08:00
sysinfo.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
time.c	stop_machine: reimplement using cpu_stop	2010-05-06 18:49:20 +02:00
topology.c	[S390] arch/s390/kernel: Add missing unlock	2010-04-09 13:43:01 +02:00
traps.c	[S390] ptrace: dont abuse PT_PTRACED	2009-12-18 17:43:32 +01:00
vdso.c	[S390] Cleanup struct _lowcore usage and defines.	2010-02-26 22:37:31 +01:00
vmlinux.lds.S	[S390] Enable kmemleak on s390.	2009-10-06 10:35:06 +02:00
vtime.c	nohz: Introduce arch_needs_cpu	2009-11-05 07:53:53 +01:00