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Konstantin Khlebnikov 909e0a4e5c vmscan: fix initial shrinker size handling 
commit 635697c663 upstream.

Stable note: The commit [acf92b48: vmscan: shrinker->nr updates race and
	go wrong] aimed to reduce excessive reclaim of slab objects but
	had bug in how it treated shrinker functions that returned -1.

A shrinker function can return -1, means that it cannot do anything
without a risk of deadlock.  For example prune_super() does this if it
cannot grab a superblock refrence, even if nr_to_scan=0.  Currently we
interpret this -1 as a ULONG_MAX size shrinker and evaluate `total_scan'
according to this.  So the next time around this shrinker can cause
really big pressure.  Let's skip such shrinkers instead.

Also make total_scan signed, otherwise the check (total_scan < 0) below
never works.

Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Dave Chinner <david@fromorbit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-08-01 12:27:20 -07:00
..
backing-dev.c backing-dev: ensure wakeup_timer is deleted 2011-11-21 14:31:25 -08:00
bootmem.c bootmem/sparsemem: remove limit constraint in alloc_bootmem_section 2012-04-02 09:27:11 -07:00
bounce.c bounce: call flush_dcache_page() after bounce_copy_vec() 2010-09-09 18:57:25 -07:00
cleancache.c mm: cleancache core ops functions and config 2011-05-26 10:01:36 -06:00
compaction.c mm: compaction: introduce sync-light migration for use by compaction 2012-08-01 12:27:18 -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.c cpuset: mm: reduce large amounts of memory barrier related damage v3 2012-08-01 12:27:20 -07:00
filemap_xip.c mm/filemap_xip.c: fix race condition in xip_file_fault() 2012-02-13 11:06:07 -08:00
fremap.c mm: don't access vm_flags as 'int' 2011-05-26 09:20:31 -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: fix BUG on mm->nr_ptes 2012-03-12 10:32:56 -07:00
hugetlb.c mm/hugetlb: fix warning in alloc_huge_page/dequeue_huge_page_vma 2012-08-01 12:27:20 -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: thp: tail page refcounting fix 2011-11-11 09:36:29 -08:00
Kconfig mm: cleancache core ops functions and config 2011-05-26 10:01:36 -06:00
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 ksm: fix NULL pointer dereference in scan_get_next_rmap_item() 2011-06-15 20:04:02 -07:00
maccess.c maccess,probe_kernel: Make write/read src const void * 2011-05-25 19:56:23 -04:00
madvise.c mm: Hold a file reference in madvise_remove 2012-07-16 08:47:52 -07:00
Makefile mm: cleancache core ops functions and config 2011-05-26 10:01:36 -06:00
memblock.c mm/memblock: properly handle overlaps and fix error path 2011-03-22 17:44:09 -07:00
memcontrol.c mm: change isolate mode from #define to bitwise type 2012-08-01 12:27:16 -07:00
memory-failure.c mm: compaction: introduce sync-light migration for use by compaction 2012-08-01 12:27:18 -07:00
memory.c mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode 2012-04-02 09:27:10 -07:00
memory_hotplug.c mm: compaction: introduce sync-light migration for use by compaction 2012-08-01 12:27:18 -07:00
mempolicy.c cpuset: mm: reduce large amounts of memory barrier related damage v3 2012-08-01 12:27:20 -07:00
mempool.c mm: remove broken 'kzalloc' mempool 2009-09-22 07:17:35 -07:00
migrate.c mm: compaction: introduce sync-light migration for use by compaction 2012-08-01 12:27:18 -07:00
mincore.c mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode 2012-04-02 09:27:10 -07:00
mlock.c mm: don't access vm_flags as 'int' 2011-05-26 09:20:31 -07:00
mm_init.c
mmap.c mm: get rid of the most spurious find_vma_prev() users 2011-06-16 00:35:09 -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 mm: nobootmem: fix sign extend problem in __free_pages_memory() 2012-05-21 09:40:02 -07:00
nommu.c NOMMU: Don't need to clear vm_mm when deleting a VMA 2012-03-12 10:32:56 -07:00
oom_kill.c oom: fix integer overflow of points in oom_badness 2012-01-06 14:13:51 -08:00
page-writeback.c writeback: introduce .tagged_writepages for the WB_SYNC_NONE sync stage 2011-10-03 11:40:43 -07:00
page_alloc.c cpuset: mm: reduce large amounts of memory barrier related damage v3 2012-08-01 12:27:20 -07:00
page_cgroup.c memcg: fix init_page_cgroup nid with sparsemem 2011-06-15 20:04:01 -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
pagewalk.c mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode 2012-04-02 09:27:10 -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: fix chunk range calculation 2011-12-21 12:57:37 -08:00
percpu.c percpu: pcpu_embed_first_chunk() should free unused parts after all allocs are complete 2012-05-21 09:40:02 -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 readahead: readahead page allocations are OK to fail 2011-05-25 08:39:25 -07:00
rmap.c mm/memory-failure.c: fix spinlock vs mutex order 2011-06-27 18:00:13 -07:00
shmem.c tmpfs: add shmem_read_mapping_page_gfp 2011-06-27 18:00:12 -07:00
slab.c cpuset: mm: reduce large amounts of memory barrier related damage v3 2012-08-01 12:27:20 -07:00
slob.c mm: Remove support for kmem_cache_name() 2011-01-23 21:00:05 +02:00
slub.c cpuset: mm: reduce large amounts of memory barrier related damage v3 2012-08-01 12:27:20 -07:00
sparse-vmemmap.c tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
sparse.c bootmem/sparsemem: remove limit constraint in alloc_bootmem_section 2012-04-02 09:27:11 -07:00
swap.c mm: fix UP THP spin_is_locked BUGs 2012-02-13 11:06:11 -08:00
swap_state.c mm: fix s390 BUG by __set_page_dirty_no_writeback on swap 2012-04-27 09:51:07 -07:00
swapfile.c mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode 2012-04-02 09:27:10 -07:00
thrash.c vmscan: implement swap token priority aging 2011-06-15 20:03:59 -07:00
truncate.c mm: fix assertion mapping->nrpages == 0 in end_writeback() 2011-06-27 18:00:13 -07:00
util.c mm: nommu: sort mm->mmap list properly 2011-05-25 08:39:05 -07:00
vmalloc.c mm: fix faulty initialization in vmalloc_init() 2012-06-17 11:23:13 -07:00
vmscan.c vmscan: fix initial shrinker size handling 2012-08-01 12:27:20 -07:00
vmstat.c mm/vmstat.c: cache align vm_stat 2012-08-01 12:26:54 -07:00