Hugh Dickins e9995ef978 ksm: rmap_walk to remove_migation_ptes ... A side-effect of making ksm pages swappable is that they have to be placed on the LRUs: which then exposes them to isolate_lru_page() and hence to page migration. Add rmap_walk() for remove_migration_ptes() to use: rmap_walk_anon() and rmap_walk_file() in rmap.c, but rmap_walk_ksm() in ksm.c. Perhaps some consolidation with existing code is possible, but don't attempt that yet (try_to_unmap needs to handle nonlinears, but migration pte removal does not). rmap_walk() is sadly less general than it appears: rmap_walk_anon(), like remove_anon_migration_ptes() which it replaces, avoids calling page_lock_anon_vma(), because that includes a page_mapped() test which fails when all migration ptes are in place. That was valid when NUMA page migration was introduced (holding mmap_sem provided the missing guarantee that anon_vma's slab had not already been destroyed), but I believe not valid in the memory hotremove case added since. For now do the same as before, and consider the best way to fix that unlikely race later on. When fixed, we can probably use rmap_walk() on hwpoisoned ksm pages too: for now, they remain among hwpoison's various exceptions (its PageKsm test comes before the page is locked, but its page_lock_anon_vma fails safely if an anon gets upgraded). Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Cc: Izik Eidus <ieidus@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Chris Wright <chrisw@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-12-15 08:53:20 -08:00
..
Kconfig	mm: stop ptlock enlarging struct page	2009-12-15 08:53:17 -08:00
Kconfig.debug	trivial: improve help text for mm debug config options	2009-09-21 15:14:57 +02:00
Makefile	percpu: kill legacy percpu allocator	2009-10-02 13:29:29 +09:00
backing-dev.c	flusher: Fix PF_FROZEN race	2009-12-03 13:49:43 +01:00
bootmem.c	bootmem: Add free_bootmem_late()	2009-11-10 12:31:43 +01:00
bounce.c	block: remove some includings of blktrace_api.h	2009-06-16 11:19:36 +02:00
debug-pagealloc.c	generic debug pagealloc	2009-04-01 08:59:13 -07:00
dmapool.c	dmapools: protect page_list walk in show_pools()	2009-06-30 18:56:00 -07:00
fadvise.c	readahead: move max_sane_readahead() calls into force_page_cache_readahead()	2009-06-16 19:47:28 -07:00
failslab.c	kmemtrace, mm: fix slab.h dependency problem in mm/failslab.c	2009-04-03 12:23:01 +02:00
filemap.c	kill wait_on_page_writeback_range	2009-12-10 15:02:50 +01:00
filemap_xip.c	const: mark struct vm_struct_operations	2009-09-27 11:39:25 -07:00
fremap.c	Do not account for the address space used by hugetlbfs using VM_ACCOUNT	2009-02-10 10:48:42 -08:00
highmem.c	highmem: Fix debug_kmap_atomic() to also handle KM_IRQ_PTE, KM_NMI, and KM_NMI_PTE	2009-11-10 04:15:47 +01:00
hugetlb.c	mm: add gfp flags for NODEMASK_ALLOC slab allocations	2009-12-15 08:53:13 -08:00
hwpoison-inject.c	HWPOISON: Add simple debugfs interface to inject hwpoison on arbitary PFNs	2009-09-16 11:50:17 +02:00
init-mm.c	mm: consolidate init_mm definition	2009-06-16 19:47:28 -07:00
internal.h	ksm: fix mlockfreed to munlocked	2009-12-15 08:53:19 -08:00
kmemcheck.c	kmemcheck: add hooks for the page allocator	2009-06-15 15:48:33 +02:00
kmemleak-test.c	percpu: clean up percpu variable definitions	2009-06-24 15:13:48 +09:00
kmemleak.c	tree-wide: fix typos "aquire" -> "acquire", "cumsumed" -> "consumed"	2009-11-09 09:40:57 +01:00
ksm.c	ksm: rmap_walk to remove_migation_ptes	2009-12-15 08:53:20 -08:00
maccess.c	[S390] maccess: add weak attribute to probe_kernel_write	2009-06-12 10:27:37 +02:00
madvise.c	Merge branch 'hwpoison' of git://git.kernel.org/pub/scm/linux/kernel/git/ak/linux-mce-2.6	2009-09-24 07:53:22 -07:00
memcontrol.c	ksm: mem cgroup charge swapin copy	2009-12-15 08:53:19 -08:00
memory-failure.c	mm: CONFIG_MMU for PG_mlocked	2009-12-15 08:53:17 -08:00
memory.c	ksm: let shared pages be swappable	2009-12-15 08:53:19 -08:00
memory_hotplug.c	mm: clear node in N_HIGH_MEMORY and stop kswapd when all memory is offlined	2009-12-15 08:53:13 -08:00
mempolicy.c	hugetlb: derive huge pages nodes allowed from task mempolicy	2009-12-15 08:53:12 -08:00
mempool.c	mm: remove broken 'kzalloc' mempool	2009-09-22 07:17:35 -07:00
migrate.c	ksm: rmap_walk to remove_migation_ptes	2009-12-15 08:53:20 -08:00
mincore.c	[CVE-2009-0029] System call wrappers part 14	2009-01-14 14:15:24 +01:00
mlock.c	ksm: fix mlockfreed to munlocked	2009-12-15 08:53:19 -08:00
mm_init.c	mm: mminit_loglevel cannot be __meminitdata anymore	2008-08-20 15:40:30 -07:00
mmap.c	mmap: don't return ENOMEM when mapcount is temporarily exceeded in munmap()	2009-12-15 08:53:11 -08:00
mmu_context.c	mm: reduce atomic use on use_mm fast path	2009-09-22 07:17:42 -07:00
mmu_notifier.c	ksm: add mmu_notifier set_pte_at_notify()	2009-09-22 07:17:31 -07:00
mmzone.c	[ARM] Double check memmap is actually valid with a memmap has unexpected holes V2	2009-05-18 11:22:24 +01:00
mprotect.c	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
mremap.c	Take arch_mmap_check() into get_unmapped_area()	2009-12-11 06:44:58 -05:00
msync.c	[CVE-2009-0029] System call wrappers part 13	2009-01-14 14:15:23 +01:00
nommu.c	NOMMU: Don't pass NULL pointers to fput() in do_mmap_pgoff()	2009-10-31 12:11:37 -07:00
oom_kill.c	oom: dump stack and VM state when oom killer panics	2009-12-15 08:53:10 -08:00
page-writeback.c	writeback: remove unused nonblocking and congestion checks	2009-12-03 13:54:25 +01:00
page_alloc.c	mm: CONFIG_MMU for PG_mlocked	2009-12-15 08:53:17 -08:00
page_cgroup.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
page_io.c	swap: rework map_swap_page() again	2009-12-15 08:53:16 -08:00
page_isolation.c	memory hotplug: fix page_zone() calculation in test_pages_isolated()	2008-11-06 15:41:19 -08:00
pagewalk.c	pagemap: pass mm into pagewalkers	2008-06-12 18:05:41 -07:00
percpu.c	Merge branch 'for-linus' into for-next	2009-12-08 10:02:12 +09:00
prio_tree.c	spelling fixes: mm/	2007-10-20 01:27:18 +02:00
quicklist.c	cpumask: use new-style cpumask ops in mm/quicklist.	2009-09-24 09:34:52 +09:30
readahead.c	readahead: introduce context readahead algorithm	2009-06-16 19:47:30 -07:00
rmap.c	ksm: rmap_walk to remove_migation_ptes	2009-12-15 08:53:20 -08:00
shmem.c	swap_info: note SWAP_MAP_SHMEM	2009-12-15 08:53:16 -08:00
shmem_acl.c	shmfs: use 'check_acl' instead of 'permission'	2009-09-08 11:08:46 -07:00
slab.c	Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-12-14 10:13:22 -08:00
slob.c	slab: remove duplicate kmem_cache_init_late() declarations	2009-08-06 11:36:25 +03:00
slub.c	Merge branch 'perf-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-12-14 10:13:22 -08:00
sparse-vmemmap.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
sparse.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
swap.c	mm: replace various uses of num_physpages by totalram_pages	2009-09-22 07:17:38 -07:00
swap_state.c	mm: add_to_swap_cache() does not return -EEXIST	2009-09-22 07:17:35 -07:00
swapfile.c	ksm: let shared pages be swappable	2009-12-15 08:53:19 -08:00
thrash.c	mm: pass mm to grab_swap_token	2009-06-23 12:50:05 -07:00
truncate.c	mm: fix comments for invalidate_inode_pages2()	2009-12-04 15:39:48 +01:00
util.c	fix a struct file leak in do_mmap_pgoff()	2009-12-11 06:44:57 -05:00
vmalloc.c	vmalloc(): adjust gfp mask passed on nested vmalloc() invocation	2009-12-15 08:53:13 -08:00
vmscan.c	vmscan: make consistent of reclaim bale out between do_try_to_free_page and shrink_zone	2009-12-15 08:53:18 -08:00
vmstat.c	vmscan: stop kswapd waiting on congestion when the min watermark is not being met	2009-12-15 08:53:16 -08:00