Mel Gorman cc715d99e5 mm: vmscan: forcibly scan highmem if there are too many buffer_heads pinning highmem ... Stuart Foster reported on bugzilla that copying large amounts of data from NTFS caused an OOM kill on 32-bit X86 with 16G of memory. Andrew Morton correctly identified that the problem was NTFS was using 512 blocks meaning each page had 8 buffer_heads in low memory pinning it. In the past, direct reclaim used to scan highmem even if the allocating process did not specify __GFP_HIGHMEM but not any more. kswapd no longer will reclaim from zones that are above the high watermark. The intention in both cases was to minimise unnecessary reclaim. The downside is on machines with large amounts of highmem that lowmem can be fully consumed by buffer_heads with nothing trying to free them. The following patch is based on a suggestion by Andrew Morton to extend the buffer_heads_over_limit case to force kswapd and direct reclaim to scan the highmem zone regardless of the allocation request or watermarks. Addresses https://bugzilla.kernel.org/show_bug.cgi?id=42578 [hughd@google.com: move buffer_heads_over_limit check up] [akpm@linux-foundation.org: buffer_heads_over_limit is unlikely] Reported-by: Stuart Foster <smf.linux@ntlworld.com> Tested-by: Stuart Foster <smf.linux@ntlworld.com> Signed-off-by: Mel Gorman <mgorman@suse.de> Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Rik van Riel <riel@redhat.com> Cc: Christoph Lameter <cl@linux.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-03-21 17:54:57 -07:00
..
backing-dev.c	backing-dev: fix wakeup timer races with bdi_unregister()	2012-02-01 16:52:49 +08:00
bootmem.c	mm: bootmem: try harder to free pages in bulk	2012-01-10 16:30:45 -08:00
bounce.c	mm: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
cleancache.c	mm: cleancache core ops functions and config	2011-05-26 10:01:36 -06:00
compaction.c	mm: compaction: make compact_control order signed	2012-03-21 17:54:56 -07:00
debug-pagealloc.c	mm, x86: Remove debug_pagealloc_enabled	2011-12-06 09:24:07 +01:00
dmapool.c	mm: fix implicit stat.h usage in dmapool.c	2011-10-31 09:20:12 -04:00
fadvise.c	fadvise: only initiate writeback for specified range with FADV_DONTNEED	2012-01-10 16:30:43 -08:00
failslab.c	switch debugfs to umode_t	2012-01-03 22:54:56 -05:00
filemap_xip.c	mm/filemap_xip.c: fix race condition in xip_file_fault()	2012-02-03 16:16:41 -08:00
filemap.c	mm: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
fremap.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
highmem.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
huge_memory.c	thp: optimize away unnecessary page table locking	2012-03-21 17:54:57 -07:00
hugetlb.c	flush_tlb_range() needs ->page_table_lock when ->mmap_sem is not held	2012-03-05 13:51:32 -08:00
hwpoison-inject.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
init-mm.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
internal.h	mm: thp: tail page refcounting fix	2011-11-02 16:06:57 -07:00
Kconfig	Merge branch 'master' into x86/memblock	2011-11-28 09:46:22 -08:00
Kconfig.debug	mm: more intensive memory corruption debugging	2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemleak-test.c	kmemleak: remove memset by using kzalloc	2011-01-27 18:31:51 +00:00
kmemleak.c	kmemleak: Disable early logging when kmemleak is off by default	2012-01-20 16:57:05 +00:00
ksm.c	mm: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
maccess.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
madvise.c	fs: kill i_alloc_sem	2011-07-20 20:47:46 -04:00
Makefile	Cross Memory Attach	2011-10-31 17:30:44 -07:00
memblock.c	memblock: Fix size aligning of memblock_alloc_base_nid()	2012-03-01 10:53:18 +01:00
memcontrol.c	mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode	2012-03-21 17:54:54 -07:00
memory_hotplug.c	mm: compaction: introduce sync-light migration for use by compaction	2012-01-12 20:13:09 -08:00
memory-failure.c	mm: compaction: introduce sync-light migration for use by compaction	2012-01-12 20:13:09 -08:00
memory.c	mm: make get_mm_counter static-inline	2012-03-21 17:54:55 -07:00
mempolicy.c	mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode	2012-03-21 17:54:54 -07:00
mempool.c	mempool: fix first round failure behavior	2012-01-10 16:30:45 -08:00
migrate.c	memcg: fix GPF when cgroup removal races with last exit	2012-03-05 15:49:43 -08:00
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	vm: avoid using find_vma_prev() unnecessarily	2012-03-06 18:23:36 -08:00
mm_init.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmap.c	mm: search from free_area_cache for the bigger size	2012-03-21 17:54:56 -07:00
mmu_context.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmu_notifier.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmzone.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
mprotect.c	mm: replace PAGE_MIGRATION with IS_ENABLED(CONFIG_MIGRATION)	2012-03-21 17:54:57 -07:00
mremap.c	mremap: enforce rmap src/dst vma ordering in case of vma_merge() succeeding in copy_vma()	2012-01-10 16:30:44 -08:00
msync.c
nobootmem.c	Merge branch 'master' into x86/memblock	2011-11-28 09:46:22 -08:00
nommu.c	NOMMU: Don't need to clear vm_mm when deleting a VMA	2012-02-24 08:59:04 -08:00
oom_kill.c	mm, oom: introduce independent oom killer ratelimit state	2012-03-21 17:54:55 -07:00
page_alloc.c	vmscan: only defer compaction for failed order and higher	2012-03-21 17:54:56 -07:00
page_cgroup.c	page_cgroup: fix horrid swap accounting regression	2012-03-06 08:18:23 -08:00
page_io.c	block: kill off REQ_UNPLUG	2011-03-10 08:52:27 +01:00
page_isolation.c	mm: page_isolation: codeclean fix comment and rm unneeded val init	2010-10-26 16:52:11 -07:00
page-writeback.c	Merge branch 'writeback-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux	2012-01-10 16:59:59 -08:00
pagewalk.c	mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode	2012-03-21 17:54:54 -07:00
percpu-km.c	percpu: clear memory allocated with the km allocator	2010-10-02 10:28:42 +03:00
percpu-vm.c	percpu: use bitmap_clear	2012-01-20 09:23:16 -08:00
percpu.c	Kmemleak patches	2012-01-14 18:11:11 -08:00
pgtable-generic.c	mm/pgtable-generic.c: fix CONFIG_SWAP=n build	2011-01-26 10:49:58 +10:00
prio_tree.c	sanitize <linux/prefetch.h> usage	2011-05-20 12:50:29 -07:00
process_vm_access.c	Fix race in process_vm_rw_core	2012-02-02 12:55:17 -08:00
quicklist.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
readahead.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
rmap.c	mm: replace PAGE_MIGRATION with IS_ENABLED(CONFIG_MIGRATION)	2012-03-21 17:54:57 -07:00
shmem.c	mm: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
slab.c	Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux	2012-01-11 18:52:23 -08:00
slob.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
slub.c	mm,x86,um: move CMPXCHG_DOUBLE config option	2012-01-12 20:13:03 -08:00
sparse-vmemmap.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
sparse.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
swap_state.c	mm: make swapin readahead skip over holes	2012-03-21 17:54:56 -07:00
swap.c	memcg: fix GPF when cgroup removal races with last exit	2012-03-05 15:49:43 -08:00
swapfile.c	mm: make swapin readahead skip over holes	2012-03-21 17:54:56 -07:00
thrash.c	mm/thrash.c: quiet sparse noise	2011-10-31 17:30:50 -07:00
truncate.c	mm: fix comment typo of truncate_inode_pages_range	2012-02-23 11:52:19 +01:00
util.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
vmalloc.c	mm: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
vmscan.c	mm: vmscan: forcibly scan highmem if there are too many buffer_heads pinning highmem	2012-03-21 17:54:57 -07:00
vmstat.c	mm,x86,um: move CMPXCHG_LOCAL config option	2012-01-12 20:13:03 -08:00