Toshi Kani 0f1cfe9d0d mm/hotplug: remove stop_machine() from try_offline_node() ...

lock_device_hotplug() serializes hotplug & online/offline operations.  The
lock is held in common sysfs online/offline interfaces and ACPI hotplug
code paths.

And here are the code paths:

- CPU & Mem online/offline via sysfs online
	store_online()->lock_device_hotplug()

- Mem online via sysfs state:
	store_mem_state()->lock_device_hotplug()

- ACPI CPU & Mem hot-add:
	acpi_scan_bus_device_check()->lock_device_hotplug()

- ACPI CPU & Mem hot-delete:
	acpi_scan_hot_remove()->lock_device_hotplug()

try_offline_node() off-lines a node if all memory sections and cpus are
removed on the node.  It is called from acpi_processor_remove() and
acpi_memory_remove_memory()->remove_memory() paths, both of which are in
the ACPI hotplug code.

try_offline_node() calls stop_machine() to stop all cpus while checking
all cpu status with the assumption that the caller is not protected from
CPU hotplug or CPU online/offline operations.  However, the caller is
always serialized with lock_device_hotplug().  Also, the code needs to be
properly serialized with a lock, not by stopping all cpus at a random
place with stop_machine().

This patch removes the use of stop_machine() in try_offline_node() and
adds comments to try_offline_node() and remove_memory() that
lock_device_hotplug() is required.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2013-09-11 15:57:41 -07:00

..

backing-dev.c

backing-dev: convert class code to use dev_groups

2013-08-19 21:22:34 -07:00

balloon_compaction.c

mm: introduce a common interface for balloon pages mobility

2012-12-11 17:22:26 -08:00

bootmem.c

mm: kill free_all_bootmem_node()

2013-07-03 16:07:39 -07:00

bounce.c

Merge branch 'for-3.10/core' of git://git.kernel.dk/linux-block

2013-05-08 10:13:35 -07:00

cleancache.c

mm: cleancache: clean up cleancache_enabled

2013-04-30 17:04:01 -07:00

compaction.c

mm: add & use zone_end_pfn() and zone_spans_pfn()

2013-02-23 17:50:20 -08:00

debug-pagealloc.c

mm, x86: Remove debug_pagealloc_enabled

2011-12-06 09:24:07 +01:00

dmapool.c

dmapool: make DMAPOOL_DEBUG detect corruption of free marker

2012-12-11 17:22:24 -08:00

fadvise.c

teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long

2013-03-03 22:46:22 -05:00

failslab.c

switch debugfs to umode_t

2012-01-03 22:54:56 -05:00

filemap_xip.c

lift sb_start_write() out of ->write()

2013-04-09 14:12:56 -04:00

filemap.c

direct-io: Handle O_(D)SYNC AIO

2013-09-04 09:23:46 -04:00

fremap.c

mm: save soft-dirty bits on file pages

2013-08-13 17:57:48 -07:00

frontswap.c

frontswap: fix incorrect zeroing and allocation size for frontswap_map

2013-06-12 16:29:46 -07:00

highmem.c

Some nice cleanups, and even a patch my wife did as a "live" demo for

2012-12-20 08:37:05 -08:00

huge_memory.c

mm/huge_memory.c: fix potential NULL pointer dereference

2013-09-11 15:57:19 -07:00

hugetlb_cgroup.c

cgroup: pass around cgroup_subsys_state instead of cgroup in file methods

2013-08-08 20:11:24 -04:00

hugetlb.c

mm, hugetlb: decrement reserve count if VM_NORESERVE alloc page cache

2013-09-11 15:57:28 -07:00

hwpoison-inject.c

memcg: rename config variables

2012-07-31 18:42:43 -07:00

init-mm.c

atomic: use <linux/atomic.h>

2011-07-26 16:49:47 -07:00

internal.h

mm: remove unused __put_page()

2013-07-09 10:33:22 -07:00

interval_tree.c

mm: add CONFIG_DEBUG_VM_RB build option

2012-10-09 16:22:42 +09:00

Kconfig

Merge remote-tracking branch 'origin/next' into kvm-ppc-next

2013-08-29 00:41:59 +02:00

Kconfig.debug

mm: more intensive memory corruption debugging

2012-01-10 16:30:42 -08:00

kmemcheck.c

…

kmemleak-test.c

…

kmemleak.c

mm: replace strict_strtoul() with kstrtoul()

2013-09-11 15:57:11 -07:00

ksm.c

mm: replace strict_strtoul() with kstrtoul()

2013-09-11 15:57:11 -07:00

maccess.c

mm: Map most files to use export.h instead of module.h

2011-10-31 09:20:12 -04:00

madvise.c

mm/madvise.c: fix coding-style errors

2013-09-11 15:57:00 -07:00

Makefile

zswap: add to mm/

2013-07-10 18:11:34 -07:00

memblock.c

mm/memblock.c: fix wrong comment in __next_free_mem_range()

2013-07-09 10:33:23 -07:00

memcontrol.c

Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2013-09-03 18:25:03 -07:00

memory_hotplug.c

mm/hotplug: remove stop_machine() from try_offline_node()

2013-09-11 15:57:41 -07:00

memory-failure.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial

2013-09-06 09:36:28 -07:00

memory.c

mm: move pgtable related functions to right place

2013-09-11 15:57:30 -07:00

mempolicy.c

mm/mempolicy: return NULL if node is NUMA_NO_NODE in get_task_policy

2013-09-11 15:57:29 -07:00

mempool.c

mempool: add @gfp_mask to mempool_create_node()

2012-06-25 11:53:47 +02:00

migrate.c

mm: migration: add migrate_entry_wait_huge()

2013-06-12 16:29:46 -07:00

mincore.c

swap: make each swap partition have one address_space

2013-02-23 17:50:17 -08:00

mlock.c

Revert "mm: introduce VM_POPULATE flag to better deal with racy userspace programs"

2013-03-28 17:45:51 -07:00

mm_init.c

mm: tune vm_committed_as percpu_counter batching size

2013-07-03 16:07:32 -07:00

mmap.c

mm: mmap_region: kill correct_wcount/inode, use allow_write_access()

2013-09-11 15:57:07 -07:00

mmu_context.c

mm: remove old aio use_mm() comment

2013-05-07 18:38:27 -07:00

mmu_notifier.c

treewide: relase -> release

2013-06-28 14:34:33 +02:00

mmzone.c

mm: rename page struct field helpers

2013-02-23 17:50:18 -08:00

mprotect.c

mm/mprotect.c: coding-style cleanups

2012-12-18 15:02:15 -08:00

mremap.c

mm: move_ptes -- Set soft dirty bit depending on pte type

2013-08-27 09:36:17 -07:00

msync.c

…

nobootmem.c

mm: concentrate modification of totalram_pages into the mm core

2013-07-03 16:07:33 -07:00

nommu.c

mm: remove free_area_cache

2013-07-10 18:11:34 -07:00

oom_kill.c

mm/oom_kill: remove weird use of ERR_PTR()/PTR_ERR().

2013-07-15 11:25:05 +09:30

page_alloc.c

mm: use zone_is_empty() instead of if(zone->spanned_pages)

2013-09-11 15:57:38 -07:00

page_cgroup.c

memcontrol: use N_MEMORY instead N_HIGH_MEMORY

2012-12-12 17:38:32 -08:00

page_io.c

mm: remove compressed copy from zram in-memory

2013-07-03 16:07:26 -07:00

page_isolation.c

page_isolation: Fix a comment typo in test_pages_isolated()

2013-08-20 13:03:41 +02:00

page-writeback.c

mm: revert "page-writeback.c: subtract min_free_kbytes from dirtyable memory"

2013-09-11 15:57:23 -07:00

pagewalk.c

mm/pagewalk.c: walk_page_range should avoid VM_PFNMAP areas

2013-05-24 16:22:53 -07:00

percpu-km.c

…

percpu-vm.c

mm: fix kernel-doc warnings

2012-06-20 14:39:36 -07:00

percpu.c

mm, percpu: Make sure percpu_alloc early parameter has an argument

2012-12-02 06:23:04 -08:00

pgtable-generic.c

mm: move pgtable related functions to right place

2013-09-11 15:57:30 -07:00

process_vm_access.c

Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys

2013-03-12 11:05:45 -07:00

quicklist.c

mm: delete various needless include <linux/module.h>

2011-10-31 09:20:11 -04:00

readahead.c

readahead: make context readahead more conservative

2013-09-11 15:57:39 -07:00

rmap.c

s390/mm: implement software referenced bits

2013-08-29 13:20:11 +02:00

shmem.c

shm_mnt is as longterm as it gets, TYVM...

2013-09-03 22:50:27 -04:00

slab_common.c

Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux

2013-07-14 15:14:29 -07:00

slab.c

kernel: delete __cpuinit usage from all core kernel files

2013-07-14 19:36:59 -04:00

slab.h

memcg: check that kmem_cache has memcg_params before accessing it

2013-08-28 19:26:38 -07:00

slob.c

Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux

2013-07-14 15:14:29 -07:00

slub.c

mm: replace strict_strtoul() with kstrtoul()

2013-09-11 15:57:11 -07:00

sparse-vmemmap.c

sparse-vmemmap: specify vmemmap population range in bytes

2013-04-29 15:54:35 -07:00

sparse.c

mm/sparse.c: put clear_hwpoisoned_pages within CONFIG_MEMORY_HOTREMOVE

2013-07-09 10:33:22 -07:00

swap_state.c

swap: avoid read_swap_cache_async() race to deadlock while waiting on discard I/O completion

2013-06-12 16:29:45 -07:00

swap.c

thp, mm: avoid PageUnevictable on active/inactive lru lists

2013-07-31 14:41:03 -07:00

swapfile.c

swap: make cluster allocation per-cpu

2013-09-11 15:57:17 -07:00

truncate.c

mm: teach truncate_inode_pages_range() to handle non page aligned ranges

2013-05-27 23:32:35 -04:00

util.c

swap: clean-up #ifdef in page_mapping()

2013-09-11 15:57:31 -07:00

vmalloc.c

mm, vmalloc: use well-defined find_last_bit() func

2013-09-11 15:57:34 -07:00

vmpressure.c

Merge branch 'for-3.12' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup

2013-09-03 18:25:03 -07:00

vmscan.c

mm: vmscan: fix numa reclaim balance problem in kswapd

2013-09-11 15:57:22 -07:00

vmstat.c

vmstat: use this_cpu() to avoid irqon/off sequence in refresh_cpu_vm_stats

2013-09-11 15:57:31 -07:00

zbud.c

mm/zbud: fix some trivial typos in comments

2013-09-11 15:57:35 -07:00

zswap.c

mm/zswap.c: get swapper address_space by using macro

2013-09-11 15:57:08 -07:00