Shaohua Li 4746efded8 vmscan: fix a livelock in kswapd ... I'm running a workload which triggers a lot of swap in a machine with 4 nodes. After I kill the workload, I found a kswapd livelock. Sometimes kswapd3 or kswapd2 are keeping running and I can't access filesystem, but most memory is free. This looks like a regression since commit 08951e5459 ("mm: vmscan: correct check for kswapd sleeping in sleeping_prematurely"). Node 2 and 3 have only ZONE_NORMAL, but balance_pgdat() will return 0 for classzone_idx. The reason is end_zone in balance_pgdat() is 0 by default, if all zones have watermark ok, end_zone will keep 0. Later sleeping_prematurely() always returns true. Because this is an order 3 wakeup, and if classzone_idx is 0, both balanced_pages and present_pages in pgdat_balanced() are 0. We add a special case here. If a zone has no page, we think it's balanced. This fixes the livelock. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Minchan Kim <minchan.kim@gmail.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2011-07-19 22:09:31 -07:00
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backing-dev.c	backing-dev: Kill set but not used var in bdi_debug_stats_show()	2011-05-20 21:23:37 +02:00
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
cleancache.c	mm: cleancache core ops functions and config	2011-05-26 10:01:36 -06:00
compaction.c	mm: compaction: abort compaction if too many pages are isolated and caller is asynchronous V2	2011-06-15 20:04:02 -07:00
debug-pagealloc.c
dmapool.c
fadvise.c
failslab.c
filemap.c	more conservative S_NOSEC handling	2011-06-03 18:24:58 -04:00
filemap_xip.c	mm: Convert i_mmap_lock to a mutex	2011-05-25 08:39:18 -07:00
fremap.c	mm: don't access vm_flags as 'int'	2011-05-26 09:20:31 -07:00
highmem.c
huge_memory.c	mm: remove khugepaged double thp vmstat update with CONFIG_NUMA=n	2011-06-15 20:03:58 -07:00
hugetlb.c	mm: fix negative commitlimit when gigantic hugepages are allocated	2011-06-15 20:04:01 -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: cleancache core ops functions and config	2011-05-26 10:01:36 -06:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
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
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	memcg: fix numa scan information update to be triggered by memory event	2011-07-08 21:14:44 -07:00
memory-failure.c	mm/memory-failure.c: fix spinlock vs mutex order	2011-06-27 18:00:13 -07:00
memory.c	mm: __tlb_remove_page() check the correct batch	2011-07-08 21:14:43 -07:00
memory_hotplug.c	mm, hotplug: protect zonelist building with zonelists_mutex	2011-06-22 21:06:48 -07:00
mempolicy.c	mm: proc: move show_numa_map() to fs/proc/task_mmu.c	2011-05-25 08:39:34 -07:00
mempool.c
migrate.c	migrate: don't account swapcache as shmem	2011-06-16 15:01:24 -07:00
mincore.c
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
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c	mm: Convert i_mmap_lock to a mutex	2011-05-25 08:39:18 -07:00
msync.c
nobootmem.c	memblock/nobootmem: remove unneeded code from alloc_bootmem_node_high()	2011-05-25 08:39:31 -07:00
nommu.c	mm/nommu.c: fix remap_pfn_range()	2011-07-08 21:14:44 -07:00
oom_kill.c	oom: replace PF_OOM_ORIGIN with toggling oom_score_adj	2011-05-25 08:39:10 -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
page_alloc.c	Revert "mm: fail GFP_DMA allocations when ZONE_DMA is not configured"	2011-06-02 06:11:24 +09:00
page_cgroup.c	memcg: fix init_page_cgroup nid with sparsemem	2011-06-15 20:04:01 -07:00
page_io.c
page_isolation.c
pagewalk.c
percpu-km.c
percpu-vm.c
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
prio_tree.c	sanitize <linux/prefetch.h> usage	2011-05-20 12:50:29 -07:00
quicklist.c
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	SLAB: Record actual last user of freed objects.	2011-06-03 19:33:50 +03:00
slob.c
slub.c	slub: always align cpu_slab to honor cmpxchg_double requirement	2011-06-03 19:33:49 +03:00
sparse-vmemmap.c
sparse.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
swap.c	mm: batch activate_page() to reduce lock contention	2011-05-25 08:39:37 -07:00
swap_state.c
swapfile.c	mm: move shmem prototypes to shmem_fs.h	2011-06-27 18:00:12 -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	Merge branch 'upstream/tidy-xen-mmu-2.6.39' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen	2011-05-26 19:01:15 -07:00
vmscan.c	vmscan: fix a livelock in kswapd	2011-07-19 22:09:31 -07:00
vmstat.c	mm, mem-hotplug: update pcp->stat_threshold when memory hotplug occur	2011-05-25 08:39:09 -07:00