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Andrea Arcangeli 5d6892407c thp: select CONFIG_COMPACTION if TRANSPARENT_HUGEPAGE enabled 
With transparent hugepage support we need compaction for the "defrag"
sysfs controls to be effective.

At the moment THP hangs the system if COMPACTION isn't selected, as
without COMPACTION lumpy reclaim wouldn't be entirely disabled.  So at the
moment it's not orthogonal.  When lumpy will be removed from the VM I can
remove the select COMPACTION in theory, but then 99% of THP users would be
still doing a mistake in disabling compaction, even if the mistake won't
return in fatal runtime but just slightly degraded performance.  So from a
theoretical standpoing forcing the below select is not needed (the
dependency isn't strict nor at compile time nor at runtime) but from a
practical standpoint it is safer.

If anybody really wants THP to run without compaction, it'd be such a
weird setup that editing the Kconfig file to allow it will be surely not a
problem.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-13 17:32:45 -08:00
..
backing-dev.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2010-10-26 17:58:44 -07:00
bootmem.c
bounce.c
compaction.c mm: compaction: perform a faster migration scan when migrating asynchronously 2011-01-13 17:32:34 -08:00
debug-pagealloc.c
dmapool.c mm: add a might_sleep_if() to dma_pool_alloc() 2010-10-26 16:52:08 -07:00
fadvise.c
failslab.c
filemap.c mm: remove likely() from grab_cache_page_write_begin() 2011-01-13 17:32:36 -08:00
filemap_xip.c
fremap.c Avoid pgoff overflow in remap_file_pages 2010-09-25 09:34:58 -07:00
highmem.c mm,x86: fix kmap_atomic_push vs ioremap_32.c 2010-10-27 18:03:05 -07:00
huge_memory.c thp: transparent hugepage config choice 2011-01-13 17:32:45 -08:00
hugetlb.c thp: clear_copy_huge_page 2011-01-13 17:32:41 -08:00
hwpoison-inject.c
init-mm.c
internal.h thp: transparent hugepage core 2011-01-13 17:32:42 -08:00
Kconfig thp: select CONFIG_COMPACTION if TRANSPARENT_HUGEPAGE enabled 2011-01-13 17:32:45 -08:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c thp: skip transhuge pages in ksm for now 2011-01-13 17:32:43 -08:00
maccess.c MN10300: Save frame pointer in thread_info struct rather than global var 2010-10-27 17:29:01 +01:00
madvise.c thp: madvise(MADV_HUGEPAGE) 2011-01-13 17:32:42 -08:00
Makefile thp: transparent hugepage core 2011-01-13 17:32:42 -08:00
memblock.c memblock: Annotate memblock functions with __init_memblock 2010-10-11 16:00:52 -07:00
memcontrol.c thp: transhuge-memcg: commit tail pages at charge 2011-01-13 17:32:43 -08:00
memory-failure.c thp: split_huge_page paging 2011-01-13 17:32:41 -08:00
memory.c thp: pmd_trans_huge migrate bugcheck 2011-01-13 17:32:42 -08:00
memory_hotplug.c thp: remove PG_buddy 2011-01-13 17:32:43 -08:00
mempolicy.c thp: add numa awareness to hugepage allocations 2011-01-13 17:32:45 -08:00
mempool.c
migrate.c thp: pmd_trans_huge migrate bugcheck 2011-01-13 17:32:42 -08:00
mincore.c thp: mincore transparent hugepage support 2011-01-13 17:32:44 -08:00
mlock.c mlock: do not hold mmap_sem for extended periods of time 2011-01-13 17:32:36 -08:00
mm_init.c
mmap.c thp: khugepaged vma merge 2011-01-13 17:32:43 -08:00
mmu_context.c
mmu_notifier.c
mmzone.c mm: page allocator: adjust the per-cpu counter threshold when memory is low 2011-01-13 17:32:31 -08:00
mprotect.c thp: mprotect: transparent huge page support 2011-01-13 17:32:44 -08:00
mremap.c thp: split_huge_page_mm/vma 2011-01-13 17:32:41 -08:00
msync.c
nommu.c mlock: do not hold mmap_sem for extended periods of time 2011-01-13 17:32:36 -08:00
oom_kill.c oom: kill all threads sharing oom killed task's mm 2010-10-26 16:52:05 -07:00
page-writeback.c writeback: avoid unnecessary determine_dirtyable_memory call 2011-01-13 17:32:38 -08:00
page_alloc.c thp: remove PG_buddy 2011-01-13 17:32:43 -08:00
page_cgroup.c
page_io.c
page_isolation.c mm: page_isolation: codeclean fix comment and rm unneeded val init 2010-10-26 16:52:11 -07:00
pagewalk.c thp: split_huge_page_mm/vma 2011-01-13 17:32:41 -08:00
percpu-km.c percpu: clear memory allocated with the km allocator 2010-10-02 10:28:42 +03:00
percpu-vm.c mm: remove gfp mask from pcpu_get_vm_areas 2011-01-13 17:32:34 -08:00
percpu.c Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2011-01-13 10:05:56 -08:00
pgtable-generic.c thp: add pmd mangling generic functions 2011-01-13 17:32:40 -08:00
prio_tree.c
quicklist.c
readahead.c
rmap.c thp: transparent hugepage vmstat 2011-01-13 17:32:43 -08:00
shmem.c fs: icache RCU free inodes 2011-01-07 17:50:26 +11:00
slab.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 2011-01-10 08:38:01 -08:00
slob.c kernel: kmem_ptr_validate considered harmful 2011-01-07 17:50:16 +11:00
slub.c mm: convert sprintf_symbol to %pS 2011-01-13 17:32:33 -08:00
sparse-vmemmap.c tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
sparse.c thp: remove PG_buddy 2011-01-13 17:32:43 -08:00
swap.c thp: transparent hugepage core 2011-01-13 17:32:42 -08:00
swap_state.c thp: split_huge_page paging 2011-01-13 17:32:41 -08:00
swapfile.c thp: split_huge_page paging 2011-01-13 17:32:41 -08:00
thrash.c
truncate.c Call the filesystem back whenever a page is removed from the page cache 2010-12-02 09:55:21 -05:00
util.c kernel: kmem_ptr_validate considered harmful 2011-01-07 17:50:16 +11:00
vmalloc.c vmalloc: remove redundant unlikely() 2011-01-13 17:32:36 -08:00
vmscan.c mm: kswapd: use the classzone idx that kswapd was using for sleeping_prematurely() 2011-01-13 17:32:37 -08:00
vmstat.c thp: transparent hugepage vmstat 2011-01-13 17:32:43 -08:00