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Arve Hjønnevåg 6d3163ce86 mm: check if any page in a pageblock is reserved before marking it MIGRATE_RESERVE 
This fixes a problem where the first pageblock got marked MIGRATE_RESERVE
even though it only had a few free pages.  eg, On current ARM port, The
kernel starts at offset 0x8000 to leave room for boot parameters, and the
memory is freed later.

This in turn caused no contiguous memory to be reserved and frequent
kswapd wakeups that emptied the caches to get more contiguous memory.

Unfortunatelly, ARM needs order-2 allocation for pgd (see
arm/mm/pgd.c#pgd_alloc()).  Therefore the issue is not minor nor easy
avoidable.

[kosaki.motohiro@jp.fujitsu.com: added some explanation]
[kosaki.motohiro@jp.fujitsu.com: add !pfn_valid_within() to check]
[minchan.kim@gmail.com: check end_pfn in pageblock_is_reserved]
Signed-off-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Dave Hansen <dave@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-05-25 08:39:24 -07:00
..
backing-dev.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
bootmem.c
crash_dump: export is_kdump_kernel to modules, consolidate elfcorehdr_addr, setup_elfcorehdr and saved_max_pfn
2011-03-23 19:47:19 -07:00
bounce.c
bounce: call flush_dcache_page() after bounce_copy_vec()
2010-09-09 18:57:25 -07:00
compaction.c
mm: compaction: minimise the time IRQs are disabled while isolating pages for migration
2011-03-22 17:44:05 -07:00
debug-pagealloc.c
…
dmapool.c
mm/dmapool.c: use TASK_UNINTERRUPTIBLE in dma_pool_alloc()
2011-01-13 17:32:48 -08:00
fadvise.c
readahead: introduce FMODE_RANDOM for POSIX_FADV_RANDOM
2010-03-06 11:26:25 -08:00
failslab.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
filemap_xip.c
mm: Convert i_mmap_lock to a mutex
2011-05-25 08:39:18 -07:00
filemap.c
mm: Convert i_mmap_lock to a mutex
2011-05-25 08:39:18 -07:00
fremap.c
mm: Convert i_mmap_lock to a mutex
2011-05-25 08:39:18 -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
mm: thp: optimize memcg charge in khugepaged
2011-05-25 08:39:21 -07:00
hugetlb.c
mm: Convert i_mmap_lock to a mutex
2011-05-25 08:39:18 -07:00
hwpoison-inject.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
init-mm.c
mm: convert mm->cpu_vm_cpumask into cpumask_var_t
2011-05-25 08:39:21 -07:00
internal.h
mm: nommu: sort mm->mmap list properly
2011-05-25 08:39:05 -07:00
Kconfig
mm: compaction: don't depend on HUGETLB_PAGE
2011-01-26 10:50:02 +10:00
Kconfig.debug
mm: debug-pagealloc: fix kconfig dependency warning
2011-03-22 17:44:02 -07:00
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: Do not return a pointer to an object that kmemleak did not get
2011-05-19 17:35:28 +01:00
ksm.c
oom: replace PF_OOM_ORIGIN with toggling oom_score_adj
2011-05-25 08:39:10 -07:00
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: khugepaged: make khugepaged aware about madvise
2011-01-13 17:32:47 -08:00
Makefile
bootmem: Separate out CONFIG_NO_BOOTMEM code into nobootmem.c
2011-02-24 14:43:05 +01:00
memblock.c
mm/memblock: properly handle overlaps and fix error path
2011-03-22 17:44:09 -07:00
memcontrol.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
memory_hotplug.c
mem-hotplug: call isolate_lru_page with elevated refcount
2011-05-25 08:39:22 -07:00
memory-failure.c
mem-hwpoison: fix page refcount around isolate_lru_page()
2011-05-25 08:39:23 -07:00
memory.c
mm: uninline large generic tlb.h functions
2011-05-25 08:39:20 -07:00
mempolicy.c
mempolicy: remove redundant check in __mpol_equal()
2011-03-22 17:44:04 -07:00
mempool.c
…
migrate.c
mm: use refcounts for page_lock_anon_vma()
2011-05-25 08:39:19 -07:00
mincore.c
thp: mincore transparent hugepage support
2011-01-13 17:32:44 -08:00
mlock.c
VM: skip the stack guard page lookup in get_user_pages only for mlock
2011-05-04 21:30:28 -07:00
mm_init.c
…
mmap.c
mm: convert anon_vma->lock to a mutex
2011-05-25 08:39:19 -07:00
mmu_context.c
exit: fix oops in sync_mm_rss
2010-03-24 16:31:21 -07:00
mmu_notifier.c
thp: mmu_notifier_test_young
2011-01-13 17:32:46 -08:00
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
mm: Convert i_mmap_lock to a mutex
2011-05-25 08:39:18 -07:00
msync.c
sanitize vfs_fsync calling conventions
2010-05-21 18:31:21 -04:00
nobootmem.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
nommu.c
mm: nommu: fix a compile warning in do_mmap_pgoff()
2011-05-25 08:39:07 -07:00
oom_kill.c
oom: replace PF_OOM_ORIGIN with toggling oom_score_adj
2011-05-25 08:39:10 -07:00
page_alloc.c
mm: check if any page in a pageblock is reserved before marking it MIGRATE_RESERVE
2011-05-25 08:39:24 -07:00
page_cgroup.c
memcg: allocate memory cgroup structures in local nodes
2011-05-11 18:50:45 -07:00
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 'for-2.6.39/core' of git://git.kernel.dk/linux-2.6-block
2011-03-24 10:16:26 -07:00
pagewalk.c
pagewalk: only split huge pages when necessary
2011-03-22 17:44:04 -07:00
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-2.6.40' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2011-05-24 11:53:42 -07:00
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
quicklist.c
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
2010-03-30 22:02:32 +09:00
readahead.c
read-ahead: use plugging
2011-03-10 08:52:26 +01:00
rmap.c
mm: optimize page_lock_anon_vma() fast-path
2011-05-25 08:39:20 -07:00
shmem.c
tmpfs: fix highmem swapoff crash regression
2011-05-20 16:23:19 -07:00
slab.c
sanitize <linux/prefetch.h> usage
2011-05-20 12:50:29 -07:00
slob.c
mm: Remove support for kmem_cache_name()
2011-01-23 21:00:05 +02:00
slub.c
slub: Fix double bit unlock in debug mode
2011-05-25 08:38:24 -07:00
sparse-vmemmap.c
tree-wide: fix comment/printk typos
2010-11-01 15:38:34 -04:00
sparse.c
Fix common misspellings
2011-03-31 11:26:23 -03:00
swap_state.c
block: remove per-queue plugging
2011-03-10 08:52:07 +01:00
swap.c
mm: check PageUnevictable in lru_deactivate_fn()
2011-05-11 18:50:44 -07:00
swapfile.c
oom: replace PF_OOM_ORIGIN with toggling oom_score_adj
2011-05-25 08:39:10 -07:00
thrash.c
…
truncate.c
mm: deactivate invalidated pages
2011-03-22 17:44:03 -07:00
util.c
mm: nommu: sort mm->mmap list properly
2011-05-25 08:39:05 -07:00
vmalloc.c
mm: print vmalloc() state after allocation failures
2011-05-25 08:39:22 -07:00
vmscan.c
mm: strictly require elevated page refcount in isolate_lru_page()
2011-05-25 08:39:23 -07:00
vmstat.c
mm, mem-hotplug: update pcp->stat_threshold when memory hotplug occur
2011-05-25 08:39:09 -07:00