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Rik van Riel 7be62de99a vmscan: kswapd carefully call compaction 
With CONFIG_COMPACTION enabled, kswapd does not try to free contiguous
free pages, even when it is woken for a higher order request.

This could be bad for eg.  jumbo frame network allocations, which are done
from interrupt context and cannot compact memory themselves.  Higher than
before allocation failure rates in the network receive path have been
observed in kernels with compaction enabled.

Teach kswapd to defragment the memory zones in a node, but only if
required and compaction is not deferred in a zone.

[akpm@linux-foundation.org: reduce scope of zones_need_compaction]
Signed-off-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Hillf Danton <dhillf@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-03-21 17:54:56 -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
vmscan: kswapd carefully call compaction
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
mm: thp: fix BUG on mm->nr_ptes
2012-03-05 15:49:43 -08:00
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
kmemcheck: Fix build errors due to missing slab.h
2010-03-30 22:02:32 +09:00
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: fix find_vma_prev
2012-03-06 16:48:03 -08:00
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
vm: avoid using find_vma_prev() unnecessarily
2012-03-06 18:23:36 -08:00
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
sanitize vfs_fsync calling conventions
2010-05-21 18:31:21 -04:00
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
vfs: fix panic in __d_lookup() with high dentry hashtable counts
2012-02-13 20:45:38 -05:00
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: unify remaining mem_cont, mem, etc. variable names to memcg
2012-01-12 20:13:06 -08:00
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
vmscan: kswapd carefully call compaction
2012-03-21 17:54:56 -07:00
vmstat.c
mm,x86,um: move CMPXCHG_LOCAL config option
2012-01-12 20:13:03 -08:00