Michal Hocko 33d5310306 mm/page_alloc.c: do not loop over ALLOC_NO_WATERMARKS without triggering reclaim ... __alloc_pages_slowpath is looping over ALLOC_NO_WATERMARKS requests if __GFP_NOFAIL is requested. This is fragile because we are basically relying on somebody else to make the reclaim (be it the direct reclaim or OOM killer) for us. The caller might be holding resources (e.g. locks) which block other other reclaimers from making any progress for example. Remove the retry loop and rely on __alloc_pages_slowpath to invoke all allowed reclaim steps and retry logic. We have to be careful about __GFP_NOFAIL allocations from the PF_MEMALLOC context even though this is a very bad idea to begin with because no progress can be gurateed at all. We shouldn't break the __GFP_NOFAIL semantic here though. It could be argued that this is essentially GFP_NOWAIT context which we do not support but PF_MEMALLOC is much harder to check for existing users because they might happen deep down the code path performed much later after setting the flag so we cannot really rule out there is no kernel path triggering this combination. Signed-off-by: Michal Hocko <mhocko@suse.com> Acked-by: Mel Gorman <mgorman@suse.de> Acked-by: David Rientjes <rientjes@google.com> Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2016-01-14 16:00:49 -08:00
..
kasan	kasan: fix kmemleak false-positive in kasan_module_alloc()	2015-11-20 16:17:32 -08:00
Kconfig	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
Kconfig.debug	mm/debug_pagealloc: remove obsolete Kconfig options	2015-01-08 15:10:52 -08:00
Makefile	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
backing-dev.c	mm, vmstat: allow WQ concurrency to discover memory reclaim doesn't make any progress	2015-12-12 10:15:34 -08:00
balloon_compaction.c	mm: page migration trylock newpage at same level as oldpage	2015-11-05 19:34:48 -08:00
bootmem.c	x86/mm: Introduce max_possible_pfn	2015-12-06 12:46:31 +01:00
cleancache.c	cleancache: remove limit on the number of cleancache enabled filesystems	2015-04-14 16:49:03 -07:00
cma.c	mm/cma.c: suppress warning	2015-11-05 19:34:48 -08:00
cma.h	mm: cma: mark cma_bitmap_maxno() inline in header	2015-08-14 15:56:32 -07:00
cma_debug.c	mm/cma_debug: correct size input to bitmap function	2015-07-17 16:39:54 -07:00
compaction.c	mm, compaction: distinguish contended status in tracepoints	2015-11-05 19:34:48 -08:00
debug-pagealloc.c	mm/debug-pagealloc: make debug-pagealloc boottime configurable	2014-12-13 12:42:48 -08:00
debug.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
dmapool.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
early_ioremap.c	mm/early_ioremap: use offset_in_page macro	2015-11-05 19:34:48 -08:00
fadvise.c	writeback: implement and use inode_congested()	2015-06-02 08:33:35 -06:00
failslab.c	mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM	2015-11-06 17:50:42 -08:00
filemap.c	mm, fs: introduce mapping_gfp_constraint()	2015-11-06 17:50:42 -08:00
frame_vector.c	mm: fix docbook comment for get_vaddr_frames()	2015-11-05 19:34:48 -08:00
frontswap.c	frontswap: allow multiple backends	2015-06-24 17:49:45 -07:00
gup.c	mm: introduce VM_LOCKONFAULT	2015-11-05 19:34:48 -08:00
highmem.c	mm/highmem: make kmap cache coloring aware	2014-08-06 18:01:22 -07:00
huge_memory.c	mm: loosen MADV_NOHUGEPAGE to enable Qemu postcopy on s390	2015-11-20 16:17:32 -08:00
hugetlb.c	mm/hugetlb.c: fix resv map memory leak for placeholder entries	2015-12-12 10:15:34 -08:00
hugetlb_cgroup.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
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: use 'unsigned int' for page order	2015-11-06 17:50:42 -08:00
interval_tree.c	mm: replace vma->sharead.linear with vma->shared	2015-02-10 14:30:31 -08:00
kmemcheck.c	mm/slab_common: move kmem_cache definition to internal header	2014-10-09 22:25:50 -04:00
kmemleak-test.c	mm/kmemleak-test.c: use pr_fmt for logging	2014-06-06 16:08:18 -07:00
kmemleak.c	Revert "gfp: add __GFP_NOACCOUNT"	2016-01-14 16:00:49 -08:00
ksm.c	ksm: unstable_tree_search_insert error checking cleanup	2015-11-05 19:34:48 -08:00
list_lru.c	memcg: simplify and inline __mem_cgroup_from_kmem	2015-11-05 19:34:48 -08:00
maccess.c	mm/maccess.c: actually return -EFAULT from strncpy_from_unsafe	2015-11-05 19:34:48 -08:00
madvise.c	mm: madvise allow remove operation for hugetlbfs	2015-09-08 15:35:28 -07:00
memblock.c	mm/memblock.c: memblock_is_memory()/reserved() can be boolean	2016-01-14 16:00:49 -08:00
memcontrol.c	slab: add SLAB_ACCOUNT flag	2016-01-14 16:00:49 -08:00
memory-failure.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
memory.c	mm, dax: fix DAX deadlocks (COW fault)	2015-11-18 16:54:36 -08:00
memory_hotplug.c	mm/memory_hotplug.c: check for missing sections in test_pages_in_a_zone()	2015-12-29 17:45:49 -08:00
mempolicy.c	mm/mempolicy.c: convert the shared_policy lock to a rwlock	2016-01-14 16:00:49 -08:00
mempool.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
memtest.c	memtest: remove unused header files	2015-09-08 15:35:28 -07:00
migrate.c	mm, page_alloc: rename __GFP_WAIT to __GFP_RECLAIM	2015-11-06 17:50:42 -08:00
mincore.c	mm/mincore: use offset_in_page macro	2015-11-05 19:34:48 -08:00
mlock.c	mm/mlock.c: drop unneeded initialization in munlock_vma_pages_range()	2016-01-14 16:00:49 -08:00
mm_init.c	mm: meminit: remove mminit_verify_page_links	2015-06-30 19:44:56 -07:00
mmap.c	mm/mmap.c: remove redundant local variables for may_expand_vm()	2016-01-14 16:00:49 -08:00
mmu_context.c	sched/mm: call finish_arch_post_lock_switch in idle_task_exit and use_mm	2014-02-21 08:50:17 +01:00
mmu_notifier.c	mmu-notifier: add clear_young callback	2015-09-10 13:29:01 -07:00
mmzone.c	mm: microoptimize zonelist operations	2015-02-11 17:06:02 -08:00
mprotect.c	userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx	2015-09-04 16:54:41 -07:00
mremap.c	x86/mm/pat: Add untrack_pfn_moved for mremap	2016-01-05 11:10:05 +01:00
msync.c	mm/msync: use offset_in_page macro	2015-11-05 19:34:48 -08:00
nobootmem.c	x86/mm: Introduce max_possible_pfn	2015-12-06 12:46:31 +01:00
nommu.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
oom_kill.c	mm/oom_kill.c: avoid attempting to kill init sharing same memory	2015-12-12 10:15:34 -08:00
page-writeback.c	treewide: Remove old email address	2015-11-23 09:44:58 +01:00
page_alloc.c	mm/page_alloc.c: do not loop over ALLOC_NO_WATERMARKS without triggering reclaim	2016-01-14 16:00:49 -08:00
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: introduce idle page tracking	2015-09-10 13:29:01 -07:00
page_idle.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
page_io.c	fs: use helper bio_add_page() instead of open coding on bi_io_vec	2015-08-13 12:32:00 -06:00
page_isolation.c	mm/page_isolation.c: add new tracepoint, test_pages_isolated	2016-01-14 16:00:49 -08:00
page_owner.c	mm/page_owner: set correct gfp_mask on page_owner	2015-07-17 16:39:54 -07:00
pagewalk.c	mm/pagewalk.c: prevent positive return value of walk_page_test() from being passed to callers	2015-03-25 16:20:30 -07:00
percpu-km.c	percpu: implmeent pcpu_nr_empty_pop_pages and chunk->nr_populated	2014-09-02 14:46:05 -04:00
percpu-vm.c	percpu: move region iterations out of pcpu_[de]populate_chunk()	2014-09-02 14:46:02 -04:00
percpu.c	mm/percpu: use offset_in_page macro	2015-11-05 19:34:48 -08:00
pgtable-generic.c	mm,thp: introduce flush_pmd_tlb_range	2015-10-17 17:48:20 +05:30
process_vm_access.c	process_vm_access: switch to {compat_,}import_iovec()	2015-04-11 22:27:12 -04:00
quicklist.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
readahead.c	mm, fs: introduce mapping_gfp_constraint()	2015-11-06 17:50:42 -08:00
rmap.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
shmem.c	kmemcg: account certain kmem allocations to memcg	2016-01-14 16:00:49 -08:00
slab.c	mm/slab.c: add a helper function get_first_slab	2016-01-14 16:00:49 -08:00
slab.h	slab: add SLAB_ACCOUNT flag	2016-01-14 16:00:49 -08:00
slab_common.c	slab: add SLAB_ACCOUNT flag	2016-01-14 16:00:49 -08:00
slob.c	slab/slub: adjust kmem_cache_alloc_bulk API	2015-11-22 11:58:44 -08:00
slub.c	slab: add SLAB_ACCOUNT flag	2016-01-14 16:00:49 -08:00
sparse-vmemmap.c	mm/sparse: use memblock apis for early memory allocations	2014-01-21 16:19:47 -08:00
sparse.c	mm: use macros from compiler.h instead of __attribute__((...))	2014-04-07 16:35:54 -07:00
swap.c	mm: make compound_head() robust	2015-11-06 17:50:42 -08:00
swap_cgroup.c	mm: page_cgroup: rename file to mm/swap_cgroup.c	2014-12-10 17:41:09 -08:00
swap_state.c	mm: swap: zswap: maybe_preload & refactoring	2015-09-08 15:35:28 -07:00
swapfile.c	mm: /proc/pid/smaps:: show proportional swap share of the mapping	2015-09-08 15:35:28 -07:00
truncate.c	memcg: add per cgroup dirty page accounting	2015-06-02 08:33:33 -06:00
userfaultfd.c	userfaultfd: avoid mmap_sem read recursion in mcopy_atomic	2015-09-04 16:54:41 -07:00
util.c	new helper: memdup_user_nul()	2016-01-04 10:20:19 -05:00
vmacache.c	mm/vmacache: inline vmacache_valid_mm()	2015-11-05 19:34:48 -08:00
vmalloc.c	vmalloc: allow to account vmalloc to memcg	2016-01-14 16:00:49 -08:00
vmpressure.c	mm/vmpressure.c: fix race in vmpressure_work_fn()	2014-12-02 17:32:07 -08:00
vmscan.c	mm: change mm_vmscan_lru_shrink_inactive() proto types	2016-01-14 16:00:49 -08:00
vmstat.c	vmstat: allocate vmstat_wq before it is used	2016-01-08 23:47:54 -08:00
workingset.c	list_lru: add helpers to isolate items	2015-02-12 18:54:10 -08:00
zbud.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zpool.c	mm: zsmalloc: constify struct zs_pool name	2015-11-06 17:50:42 -08:00
zsmalloc.c	zsmalloc: use page->private instead of page->first_page	2015-11-06 17:50:42 -08:00
zswap.c	mm/zswap: change incorrect strncmp use to strcmp	2015-12-18 14:25:40 -08:00