Hugh Dickins d952b79136 ksm: fix endless loop on oom ... break_ksm has been looping endlessly ignoring VM_FAULT_OOM: that should only be a problem for ksmd when a memory control group imposes limits (normally the OOM killer will kill others with an mm until it succeeds); but in general (especially for MADV_UNMERGEABLE and KSM_RUN_UNMERGE) we do need to route the error (or kill) back to the caller (or sighandling). Test signal_pending in unmerge_ksm_pages, which could be a lengthy procedure if it has to spill into swap: returning -ERESTARTSYS so that trivial signals will restart but fatals will terminate (is that right? we do different things in different places in mm, none exactly this). unmerge_and_remove_all_rmap_items was forgetting to lock when going down the mm_list: fix that. Whether it's successful or not, reset ksm_scan cursor to head; but only if it's successful, reset seqnr (shown in full_scans) - page counts will have gone down to zero. This patch leaves a significant OOM deadlock, but it's a good step on the way, and that deadlock is fixed in a subsequent patch. Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk> Acked-by: Izik Eidus <ieidus@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2009-09-22 07:17:32 -07:00
..
allocpercpu.c	percpu: use dynamic percpu allocator as the default percpu allocator	2009-06-24 15:13:35 +09:00
backing-dev.c	writeback: splice dirty inode entries to default bdi on bdi_destroy()	2009-09-16 15:18:52 +02:00
bootmem.c	kmemleak: Do not report alloc_bootmem blocks as leaks	2009-08-27 14:29:17 +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	mm: oom analysis: add shmem vmstat	2009-09-22 07:17:27 -07:00
filemap_xip.c	mm: do_xip_mapping_read: fix length calculation	2009-04-02 19:04:49 -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	block: remove some includings of blktrace_api.h	2009-06-16 11:19:36 +02:00
hugetlb.c	hugetlb: restore interleaving of bootmem huge pages	2009-09-22 07:17:26 -07:00
init-mm.c	mm: consolidate init_mm definition	2009-06-16 19:47:28 -07:00
internal.h	vmscan: do not unconditionally treat zones that fail zone_reclaim() as full	2009-06-16 19:47:45 -07:00
Kconfig	ksm: the mm interface to ksm	2009-09-22 07:17:31 -07:00
Kconfig.debug	kmemcheck: enable in the x86 Kconfig	2009-06-15 15:49:15 +02:00
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	kmemleak: Improve the "Early log buffer exceeded" error message	2009-09-11 10:42:09 +01:00
ksm.c	ksm: fix endless loop on oom	2009-09-22 07:17:32 -07:00
maccess.c	[S390] maccess: add weak attribute to probe_kernel_write	2009-06-12 10:27:37 +02:00
madvise.c	ksm: the mm interface to ksm	2009-09-22 07:17:31 -07:00
Makefile	ksm: the mm interface to ksm	2009-09-22 07:17:31 -07:00
memcontrol.c	cgroup avoid permanent sleep at rmdir	2009-07-29 19:10:35 -07:00
memory.c	ksm: identify PageKsm pages	2009-09-22 07:17:31 -07:00
memory_hotplug.c	memory hotplug: update zone pcp at memory online	2009-09-22 07:17:25 -07:00
mempolicy.c	mm: make set_mempolicy(MPOL_INTERLEAV) N_HIGH_MEMORY aware	2009-08-07 10:39:55 -07:00
mempool.c	mempool.c: clean up type-casting	2009-08-10 08:31:16 -07:00
migrate.c	mm: vmstat: add isolate pages	2009-09-22 07:17:29 -07:00
mincore.c	[CVE-2009-0029] System call wrappers part 14	2009-01-14 14:15:24 +01:00
mlock.c	mm: remove CONFIG_UNEVICTABLE_LRU config option	2009-06-16 19:47:42 -07:00
mm_init.c	mm: mminit_loglevel cannot be __meminitdata anymore	2008-08-20 15:40:30 -07:00
mmap.c	perf: Do the big rename: Performance Counters -> Performance Events	2009-09-21 14:28:04 +02:00
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	ksm: prevent mremap move poisoning	2009-09-22 07:17:31 -07:00
msync.c	[CVE-2009-0029] System call wrappers part 13	2009-01-14 14:15:23 +01:00
nommu.c	nommu: fix error handling in do_mmap_pgoff()	2009-09-05 11:30:42 -07:00
oom_kill.c	mm: revert "oom: move oom_adj value"	2009-08-18 16:31:13 -07:00
page-writeback.c	mm: count only reclaimable lru pages	2009-09-22 07:17:30 -07:00
page_alloc.c	mm: perform non-atomic test-clear of PG_mlocked on free	2009-09-22 07:17:30 -07:00
page_cgroup.c	memory hotplug: alloc page from other node in memory online	2009-09-22 07:17:26 -07:00
page_io.c	mm: remove file argument from swap_readpage()	2009-06-16 19:47:44 -07:00
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-next' into for-linus	2009-09-15 09:57:19 +09:00
prio_tree.c	spelling fixes: mm/	2007-10-20 01:27:18 +02:00
quicklist.c	percpu: cleanup percpu array definitions	2009-06-24 15:13:45 +09:00
readahead.c	readahead: introduce context readahead algorithm	2009-06-16 19:47:30 -07:00
rmap.c	ksm: no debug in page_dup_rmap()	2009-09-22 07:17:31 -07:00
shmem.c	Driver Core: devtmpfs - kernel-maintained tmpfs-based /dev	2009-09-15 09:50:49 -07:00
shmem_acl.c	shmfs: use 'check_acl' instead of 'permission'	2009-09-08 11:08:46 -07:00
slab.c	SLAB: Fix lockdep annotations	2009-06-29 09:57:10 +03:00
slob.c	slab: remove duplicate kmem_cache_init_late() declarations	2009-08-06 11:36:25 +03:00
slub.c	slub: Fix build error in kmem_cache_open() with !CONFIG_SLUB_DEBUG	2009-09-15 22:32:10 +03:00
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: fix Committed_AS underflow on large NR_CPUS environment	2009-05-02 15:36:10 -07:00
swap_state.c	writeback: add name to backing_dev_info	2009-09-11 09:20:26 +02:00
swapfile.c	block: use blkdev_issue_discard in blk_ioctl_discard	2009-09-14 08:24:53 +02:00
thrash.c	mm: pass mm to grab_swap_token	2009-06-23 12:50:05 -07:00
truncate.c	mm: remove __invalidate_mapping_pages variant	2009-06-16 19:47:43 -07:00
util.c	Merge branches 'slab/documentation', 'slab/fixes', 'slob/cleanups' and 'slub/fixes' into for-linus	2009-06-17 08:30:15 +03:00
vmalloc.c	vmalloc.c: fix double error checking	2009-09-22 07:17:30 -07:00
vmscan.c	vmscan: kill unnecessary prefetch	2009-09-22 07:17:30 -07:00
vmstat.c	mm: vmstat: add isolate pages	2009-09-22 07:17:29 -07:00