Yasuaki Ishimatsu 6677e3eaf4 memory-hotplug: check whether all memory blocks are offlined or not when removing memory ... We remove the memory like this: 1. lock memory hotplug 2. offline a memory block 3. unlock memory hotplug 4. repeat 1-3 to offline all memory blocks 5. lock memory hotplug 6. remove memory(TODO) 7. unlock memory hotplug All memory blocks must be offlined before removing memory. But we don't hold the lock in the whole operation. So we should check whether all memory blocks are offlined before step6. Otherwise, kernel maybe panicked. Offlining a memory block and removing a memory device can be two different operations. Users can just offline some memory blocks without removing the memory device. For this purpose, the kernel has held lock_memory_hotplug() in __offline_pages(). To reuse the code for memory hot-remove, we repeat step 1-3 to offline all the memory blocks, repeatedly lock and unlock memory hotplug, but not hold the memory hotplug lock in the whole operation. Signed-off-by: Wen Congyang <wency@cn.fujitsu.com> Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Jiang Liu <jiang.liu@huawei.com> Cc: Jianguo Wu <wujianguo@huawei.com> Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> Cc: Wu Jianguo <wujianguo@huawei.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2013-02-23 17:50:11 -08:00
..
backing-dev.c	bdi: allow block devices to say that they require stable page writes	2013-02-21 17:22:19 -08:00
balloon_compaction.c	mm: introduce a common interface for balloon pages mobility	2012-12-11 17:22:26 -08:00
bootmem.c	mm: Add alloc_bootmem_low_pages_nopanic()	2013-01-29 19:32:59 -08:00
bounce.c	block: optionally snapshot page contents to provide stable pages during write	2013-02-21 17:22:20 -08:00
cleancache.c	->encode_fh() API change	2012-05-29 23:28:33 -04:00
compaction.c	mm: compaction: make __compact_pgdat() and compact_pgdat() return void	2013-02-23 17:50:10 -08:00
debug-pagealloc.c
dmapool.c	dmapool: make DMAPOOL_DEBUG detect corruption of free marker	2012-12-11 17:22:24 -08:00
fadvise.c	switch simple cases of fget_light to fdget	2012-09-26 22:20:08 -04:00
failslab.c	switch debugfs to umode_t	2012-01-03 22:54:56 -05:00
filemap_xip.c	mm: move all mmu notifier invocations to be done outside the PT lock	2012-10-09 16:22:58 +09:00
filemap.c	mm: only enforce stable page writes if the backing device requires it	2013-02-21 17:22:19 -08:00
fremap.c	mm: introduce VM_POPULATE flag to better deal with racy userspace programs	2013-02-23 17:50:11 -08:00
frontswap.c	frontswap: support exclusive gets if tmem backend is capable	2012-09-21 10:38:12 -04:00
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: use new hashtable implementation	2013-02-23 17:50:10 -08:00
hugetlb_cgroup.c	mm/hugetlb: create hugetlb cgroup file in hugetlb_init	2012-12-18 15:02:15 -08:00
hugetlb.c	mm/hugetlb.c: convert to pr_foo()	2013-02-23 17:50:09 -08:00
hwpoison-inject.c	memcg: rename config variables	2012-07-31 18:42:43 -07:00
init-mm.c
internal.h	mm: directly use __mlock_vma_pages_range() in find_extend_vma()	2013-02-23 17:50:11 -08:00
interval_tree.c	mm: add CONFIG_DEBUG_VM_RB build option	2012-10-09 16:22:42 +09:00
Kconfig	Merge branch 'akpm' (incoming from Andrew)	2013-02-21 17:38:49 -08:00
Kconfig.debug	mm: more intensive memory corruption debugging	2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemleak-test.c
kmemleak.c	mm/kmemleak.c: remove obsolete simple_strtoul	2012-12-18 15:02:15 -08:00
ksm.c	mm/ksm.c: use new hashtable implementation	2013-02-23 17:50:10 -08:00
maccess.c
madvise.c	mm: make madvise(MADV_WILLNEED) support swap file prefetch	2013-02-23 17:50:10 -08:00
Makefile	mm: introduce a common interface for balloon pages mobility	2012-12-11 17:22:26 -08:00
memblock.c	memblock: Add memblock_mem_size()	2013-01-29 19:32:57 -08:00
memcontrol.c	mm/memcontrol.c: convert printk(KERN_FOO) to pr_foo()	2013-02-23 17:50:09 -08:00
memory_hotplug.c	memory-hotplug: check whether all memory blocks are offlined or not when removing memory	2013-02-23 17:50:11 -08:00
memory-failure.c	Automatic NUMA Balancing V11	2012-12-16 15:18:08 -08:00
memory.c	mm: directly use __mlock_vma_pages_range() in find_extend_vma()	2013-02-23 17:50:11 -08:00
mempolicy.c	mm: mempolicy: Convert shared_policy mutex to spinlock	2013-01-02 17:32:13 -08:00
mempool.c	mempool: add @gfp_mask to mempool_create_node()	2012-06-25 11:53:47 +02:00
migrate.c	mm/hugetlb: set PTE as huge in hugetlb_change_protection and remove_migration_pte	2013-02-05 20:38:47 +11:00
mincore.c	mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode	2012-03-21 17:54:54 -07:00
mlock.c	mm: introduce VM_POPULATE flag to better deal with racy userspace programs	2013-02-23 17:50:11 -08:00
mm_init.c
mmap.c	mm: make do_mmap_pgoff return populate as a size in bytes, not as a bool	2013-02-23 17:50:11 -08:00
mmu_context.c	mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat()	2012-03-21 17:54:59 -07:00
mmu_notifier.c	mm/mmu_notifier: allocate mmu_notifier in advance	2012-10-25 14:37:53 -07:00
mmzone.c	memcg: fix hotplugged memory zone oops	2012-11-16 14:33:04 -08:00
mprotect.c	mm/mprotect.c: coding-style cleanups	2012-12-18 15:02:15 -08:00
mremap.c	mm: use mm_populate() for mremap() of VM_LOCKED vmas	2013-02-23 17:50:11 -08:00
msync.c
nobootmem.c	mm: Add alloc_bootmem_low_pages_nopanic()	2013-01-29 19:32:59 -08:00
nommu.c	mm: make do_mmap_pgoff return populate as a size in bytes, not as a bool	2013-02-23 17:50:11 -08:00
oom_kill.c	memcg, oom: provide more precise dump info while memcg oom happening	2013-02-23 17:50:08 -08:00
page_alloc.c	mm/page_alloc.c:__setup_per_zone_wmarks: make min_pages unsigned long	2013-02-23 17:50:10 -08:00
page_cgroup.c	memcontrol: use N_MEMORY instead N_HIGH_MEMORY	2012-12-12 17:38:32 -08:00
page_io.c	mm: add support for direct_IO to highmem pages	2012-07-31 18:42:47 -07:00
page_isolation.c	mm: fix zone_watermark_ok_safe() accounting of isolated pages	2013-01-04 16:11:46 -08:00
page-writeback.c	block: optionally snapshot page contents to provide stable pages during write	2013-02-21 17:22:20 -08:00
pagewalk.c	thp: change split_huge_page_pmd() interface	2012-12-12 17:38:31 -08:00
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: Only flush the TLB when clearing an accessible pte	2012-12-11 14:28:34 +00:00
process_vm_access.c	aio/vfs: cleanup of rw_copy_check_uvector() and compat_rw_copy_check_uvector()	2012-05-31 17:49:32 -07:00
quicklist.c
readahead.c	switch simple cases of fget_light to fdget	2012-09-26 22:20:08 -04:00
rmap.c	s390/mm: implement software dirty bits	2013-02-14 15:55:23 +01:00
shmem.c	mempolicy: remove arg from mpol_parse_str, mpol_to_str	2013-01-02 09:27:10 -08:00
slab_common.c	slab: propagate tunable values	2012-12-18 15:02:14 -08:00
slab.c	memcg: add comments clarifying aspects of cache attribute propagation	2012-12-18 15:02:15 -08:00
slab.h	slab: propagate tunable values	2012-12-18 15:02:14 -08:00
slob.c	sl[au]b: always get the cache from its page in kmem_cache_free()	2012-12-18 15:02:14 -08:00
slub.c	slub: drop mutex before deleting sysfs entry	2012-12-18 15:02:15 -08:00
sparse-vmemmap.c
sparse.c	memory-hotplug, mm/sparse.c: clear the memory to store struct page	2012-12-11 17:22:23 -08:00
swap_state.c	mm: add support for a filesystem to activate swap files and use direct_IO for writing swap pages	2012-07-31 18:42:47 -07:00
swap.c	mm: remove vma arg from page_evictable	2012-10-09 16:22:55 +09:00
swapfile.c	mm, oom: fix race when specifying a thread as the oom origin	2012-12-11 17:22:27 -08:00
truncate.c	mm: drop vmtruncate	2012-12-20 18:46:29 -05:00
util.c	mm: make do_mmap_pgoff return populate as a size in bytes, not as a bool	2013-02-23 17:50:11 -08:00
vmalloc.c	mm: use IS_ENABLED(CONFIG_NUMA) instead of NUMA_BUILD	2012-12-11 17:22:22 -08:00
vmscan.c	mm: avoid calling pgdat_balanced() needlessly	2013-02-23 17:50:10 -08:00
vmstat.c	Automatic NUMA Balancing V11	2012-12-16 15:18:08 -08:00