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Joonsoo Kim f1c1e9f7b5 mm/debug_pagealloc.c: don't allocate page_ext if we don't use guard page 
What debug_pagealloc does is just mapping/unmapping page table.
Basically, it doesn't need additional memory space to memorize
something.  But, with guard page feature, it requires additional memory
to distinguish if the page is for guard or not.  Guard page is only used
when debug_guardpage_minorder is non-zero so this patch removes
additional memory allocation (page_ext) if debug_guardpage_minorder is
zero.

It saves memory if we just use debug_pagealloc and not guard page.

Link: http://lkml.kernel.org/r/1471315879-32294-3-git-send-email-iamjoonsoo.kim@lge.com
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-10-07 18:46:27 -07:00
..
kasan
kasan: remove the unnecessary WARN_ONCE from quarantine.c
2016-08-11 16:58:14 -07:00
backing-dev.c
block: fix bdi vs gendisk lifetime mismatch
2016-08-04 14:19:16 -06:00
balloon_compaction.c
mm: balloon: use general non-lru movable page feature
2016-07-26 16:19:19 -07:00
bootmem.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
cleancache.c
cleancache: constify cleancache_ops structure
2016-01-27 09:09:57 -05:00
cma_debug.c
mm/cma_debug: correct size input to bitmap function
2015-07-17 16:39:54 -07:00
cma.c
mm/cma: silence warnings due to max() usage
2016-05-27 14:49:37 -07:00
cma.h
mm: cma: mark cma_bitmap_maxno() inline in header
2015-08-14 15:56:32 -07:00
compaction.c
mm, compaction: require only min watermarks for non-costly orders
2016-10-07 18:46:27 -07:00
debug_page_ref.c
mm/page_ref: add tracepoint to track down page reference manipulation
2016-03-17 15:09:34 -07:00
debug.c
mm: avoid endless recursion in dump_page()
2016-09-19 15:36:16 -07:00
dmapool.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
early_ioremap.c
mm/early_ioremap: use offset_in_page macro
2015-11-05 19:34:48 -08:00
fadvise.c
mm/fadvise.c: do not discard partial pages with POSIX_FADV_DONTNEED
2016-06-09 14:23:11 -07:00
failslab.c
mm: fault-inject take over bootstrap kmem_cache check
2016-03-15 16:55:16 -07:00
filemap.c
xfs: updates for 4.9-rc1
2016-10-06 08:18:10 -07:00
frame_vector.c
mm/gup: Switch all callers of get_user_pages() to not pass tsk/mm
2016-02-16 10:11:12 +01:00
frontswap.c
mm, frontswap: convert frontswap_enabled to static key
2016-07-26 16:19:19 -07:00
gup.c
- ARM: GICv3 ITS emulation and various fixes. Removal of the old
2016-08-02 16:11:27 -04:00
highmem.c
mm/highmem: make nr_free_highpages() handles all highmem zones by itself
2016-05-19 19:12:14 -07:00
huge_memory.c
Merge branch 'linus' into sched/core, to pick up fixes
2016-09-30 10:44:27 +02:00
hugetlb_cgroup.c
mm, hugetlb_cgroup: round limit_in_bytes down to hugepage size
2016-05-20 17:58:30 -07:00
hugetlb.c
mm/hugetlb: fix incorrect hugepages count during mem hotplug
2016-08-11 16:58:13 -07:00
hwpoison-inject.c
hwpoison: use page_cgroup_ino for filtering by memcg
2015-09-10 13:29:01 -07:00
init-mm.c
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
internal.h
mm, compaction: make whole_zone flag ignore cached scanner positions
2016-10-07 18:46:27 -07:00
interval_tree.c
mm: replace vma->sharead.linear with vma->shared
2015-02-10 14:30:31 -08:00
Kconfig
mm: clarify COMPACTION Kconfig text
2016-08-26 17:39:35 -07:00
Kconfig.debug
PM / Hibernate: allow hibernation with PAGE_POISONING_ZERO
2016-09-13 02:35:27 +02:00
khugepaged.c
mm, thp: fix leaking mapped pte in __collapse_huge_page_swapin()
2016-09-19 15:36:16 -07:00
kmemcheck.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak-test.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
kmemleak.c
kmemleak: don't hang if user disables scanning early
2016-07-28 16:07:41 -07:00
ksm.c
mm,ksm: fix endless looping in allocating memory when ksm enable
2016-09-28 16:19:01 -07:00
list_lru.c
mm: memcontrol: move kmem accounting code to CONFIG_MEMCG
2016-01-20 17:09:18 -08:00
maccess.c
x86: remove more uaccess_32.h complexity
2016-05-22 17:21:27 -07:00
madvise.c
mm: make mmap_sem for write waits killable for mm syscalls
2016-05-23 17:04:14 -07:00
Makefile
Implements HARDENED_USERCOPY verification of copy_to_user/copy_from_user
2016-08-08 14:48:14 -07:00
memblock.c
mm/memblock.c: fix NULL dereference error
2016-08-04 20:02:09 -04:00
memcontrol.c
mm: memcontrol: add sanity checks for memcg->id.ref on get/put
2016-10-07 18:46:26 -07:00
memory_hotplug.c
mem-hotplug: use nodes that contain memory as mask in new_node_page()
2016-09-28 16:19:02 -07:00
memory-failure.c
mm: hwpoison: remove incorrect comments
2016-07-28 16:07:41 -07:00
memory.c
Merge branch 'linus' into sched/core, to pick up fixes
2016-09-30 10:44:27 +02:00
mempolicy.c
mm, mempolicy: task->mempolicy must be NULL before dropping final reference
2016-09-01 17:52:01 -07:00
mempool.c
Revert "mm, mempool: only set __GFP_NOMEMALLOC if there are free elements"
2016-07-28 16:07:41 -07:00
memtest.c
memtest: remove unused header files
2015-09-08 15:35:28 -07:00
migrate.c
mm, thp: remove __GFP_NORETRY from khugepaged and madvised allocations
2016-07-28 16:07:41 -07:00
mincore.c
mm, fs: remove remaining PAGE_CACHE_* and page_cache_{get,release} usage
2016-04-04 10:41:08 -07:00
mlock.c
mm, vmscan: move LRU lists to node
2016-07-28 16:07:41 -07:00
mm_init.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
mmap.c
Merge branch 'x86-vdso-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-10-03 17:29:01 -07:00
mmu_context.c
mm/mmu_context, sched/core: Fix mmu_context.h assumption
2016-04-28 11:44:19 +02:00
mmu_notifier.c
fix Christoph's email addresses
2016-03-17 15:09:34 -07:00
mmzone.c
mm, page_alloc: inline the fast path of the zonelist iterator
2016-05-19 19:12:14 -07:00
mprotect.c
mm: thp: check pmd_trans_unstable() after split_huge_pmd()
2016-07-26 16:19:19 -07:00
mremap.c
mm: thp: check pmd_trans_unstable() after split_huge_pmd()
2016-07-26 16:19:19 -07:00
msync.c
mm/msync: use offset_in_page macro
2015-11-05 19:34:48 -08:00
nobootmem.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
nommu.c
mm: introduce fault_env
2016-07-26 16:19:19 -07:00
oom_kill.c
mm/oom_kill.c: fix task_will_free_mem() comment
2016-10-07 18:46:26 -07:00
page_alloc.c
mm/debug_pagealloc.c: don't allocate page_ext if we don't use guard page
2016-10-07 18:46:27 -07:00
page_counter.c
mm: page_counter: let page_counter_try_charge() return bool
2015-11-05 19:34:48 -08:00
page_ext.c
mm: use early_pfn_to_nid in page_ext_init
2016-05-27 14:49:37 -07:00
page_idle.c
mm, vmscan: move lru_lock to the node
2016-07-28 16:07:41 -07:00
page_io.c
mm: fix the page_swap_info() BUG_ON check
2016-09-19 15:36:17 -07:00
page_isolation.c
mm/page_isolation: clean up confused code
2016-07-26 16:19:19 -07:00
page_owner.c
mm/page_owner: use stackdepot to store stacktrace
2016-07-26 16:19:19 -07:00
page_poison.c
mm: check the return value of lookup_page_ext for all call sites
2016-06-03 15:06:22 -07:00
page-writeback.c
mm, vmscan: get rid of throttle_vm_writeout
2016-10-07 18:46:27 -07:00
pagewalk.c
thp: rename split_huge_page_pmd() to split_huge_pmd()
2016-01-15 17:56:32 -08:00
percpu-km.c
mm: percpu: use pr_fmt to prefix output
2016-03-17 15:09:34 -07:00
percpu-vm.c
percpu: move region iterations out of pcpu_[de]populate_chunk()
2014-09-02 14:46:02 -04:00
percpu.c
percpu: fix synchronization between synchronous map extension and chunk destruction
2016-05-25 11:48:25 -04:00
pgtable-generic.c
mm/thp/migration: switch from flush_tlb_range to flush_pmd_tlb_range
2016-03-17 15:09:34 -07:00
process_vm_access.c
mm/gup: Introduce get_user_pages_remote()
2016-02-16 10:04:09 +01:00
quicklist.c
fix Christoph's email addresses
2016-03-17 15:09:34 -07:00
readahead.c
mm: silently skip readahead for DAX inodes
2016-08-26 17:39:35 -07:00
rmap.c
rmap: fix compound check logic in page_remove_file_rmap
2016-08-10 16:40:56 -07:00
shmem.c
huge tmpfs: fix Committed_AS leak
2016-09-24 11:20:01 -07:00
slab_common.c
mm: charge/uncharge kmemcg from generic page allocator paths
2016-07-26 16:19:19 -07:00
slab.c
slab: Convert to hotplug state machine
2016-09-06 18:30:20 +02:00
slab.h
mm, kasan: switch SLUB to stackdepot, enable memory quarantine for SLUB
2016-07-28 16:07:41 -07:00
slob.c
mm: slab: free kmem_cache_node after destroy sysfs file
2016-02-18 16:23:24 -08:00
slub.c
slub: Convert to hotplug state machine
2016-09-06 18:30:20 +02:00
sparse-vmemmap.c
treewide: replace obsolete _refok by __ref
2016-08-02 17:31:41 -04:00
sparse.c
treewide: replace obsolete _refok by __ref
2016-08-02 17:31:41 -04:00
swap_cgroup.c
mm: convert printk(KERN_<LEVEL> to pr_<level>
2016-03-17 15:09:34 -07:00
swap_state.c
mm: move most file-based accounting to the node
2016-07-28 16:07:41 -07:00
swap.c
mm, pagevec: release/reacquire lru_lock on pgdat change
2016-07-28 16:07:41 -07:00
swapfile.c
mm: fix the page_swap_info() BUG_ON check
2016-09-19 15:36:17 -07:00
truncate.c
truncate: handle file thp
2016-07-26 16:19:19 -07:00
usercopy.c
mm: usercopy: Check for module addresses
2016-09-20 16:07:39 -07:00
userfaultfd.c
mm, fs: get rid of PAGE_CACHE_* and page_cache_{get,release} macros
2016-04-04 10:41:08 -07:00
util.c
mm: move most file-based accounting to the node
2016-07-28 16:07:41 -07:00
vmacache.c
mm/vmacache: inline vmacache_valid_mm()
2015-11-05 19:34:48 -08:00
vmalloc.c
mm/vmalloc.c: fix align value calculation error
2016-10-07 18:46:26 -07:00
vmpressure.c
mm/vmpressure.c: fix subtree pressure detection
2016-02-03 08:28:43 -08:00
vmscan.c
mm, vmscan: get rid of throttle_vm_writeout
2016-10-07 18:46:27 -07:00
vmstat.c
mm: remove reclaim and compaction retry approximations
2016-07-28 16:07:41 -07:00
workingset.c
mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()
2016-09-30 15:26:52 -07:00
z3fold.c
mm/z3fold.c: avoid modifying HEADLESS page and minor cleanup
2016-06-03 16:02:55 -07:00
zbud.c
mm/zbud.c: use list_last_entry() instead of list_tail_entry()
2016-01-15 11:40:52 -08:00
zpool.c
mm: zsmalloc: constify struct zs_pool name
2015-11-06 17:50:42 -08:00
zsmalloc.c
zsmalloc: Delete an unnecessary check before the function call "iput"
2016-07-28 16:07:41 -07:00
zswap.c
mm/zswap: use workqueue to destroy pool
2016-05-20 17:58:30 -07:00