Yang Shi 0730292ca8 mm: move_pages: report the number of non-attempted pages ... commit 5984fabb6e upstream. Since commit a49bd4d716 ("mm, numa: rework do_pages_move"), the semantic of move_pages() has changed to return the number of non-migrated pages if they were result of a non-fatal reasons (usually a busy page). This was an unintentional change that hasn't been noticed except for LTP tests which checked for the documented behavior. There are two ways to go around this change. We can even get back to the original behavior and return -EAGAIN whenever migrate_pages is not able to migrate pages due to non-fatal reasons. Another option would be to simply continue with the changed semantic and extend move_pages documentation to clarify that -errno is returned on an invalid input or when migration simply cannot succeed (e.g. -ENOMEM, -EBUSY) or the number of pages that couldn't have been migrated due to ephemeral reasons (e.g. page is pinned or locked for other reasons). This patch implements the second option because this behavior is in place for some time without anybody complaining and possibly new users depending on it. Also it allows to have a slightly easier error handling as the caller knows that it is worth to retry when err > 0. But since the new semantic would be aborted immediately if migration is failed due to ephemeral reasons, need include the number of non-attempted pages in the return value too. Link: http://lkml.kernel.org/r/1580160527-109104-1-git-send-email-yang.shi@linux.alibaba.com Fixes: a49bd4d716 ("mm, numa: rework do_pages_move") Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> Suggested-by: Michal Hocko <mhocko@suse.com> Acked-by: Michal Hocko <mhocko@suse.com> Reviewed-by: Wei Yang <richardw.yang@linux.intel.com> Cc: <stable@vger.kernel.org> [4.17+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-02-11 04:33:56 -08:00
..
kasan	kernel/memremap, kasan: make ZONE_DEVICE with work with KASAN	2018-08-17 16:20:30 -07:00
backing-dev.c	writeback: synchronize sync(2) against cgroup writeback membership switches	2019-03-05 17:58:50 +01:00
balloon_compaction.c
bootmem.c	docs/mm: bootmem: add overview documentation	2018-08-02 12:17:27 -06:00
cleancache.c	mm: use octal not symbolic permissions	2018-06-15 07:55:25 +09:00
cma.c	mm/cma.c: fail if fixed declaration can't be honored	2019-08-06 19:06:51 +02:00
cma.h
cma_debug.c	mm/cma_debug.c: fix the break condition in cma_maxchunk_get()	2019-06-15 11:54:01 +02:00
compaction.c	mm/compaction.c: clear total_{migrate,free}_scanned before scanning a new zone	2019-10-05 13:10:13 +02:00
debug.c	mm: get rid of vmacache_flush_all() entirely	2018-09-13 15:18:04 -10:00
debug_page_ref.c
dmapool.c	mm: use octal not symbolic permissions	2018-06-15 07:55:25 +09:00
early_ioremap.c
fadvise.c	vfs: implement readahead(2) using POSIX_FADV_WILLNEED	2018-08-30 20:01:32 +02:00
failslab.c	mm: use octal not symbolic permissions	2018-06-15 07:55:25 +09:00
filemap.c	mm/filemap.c: don't initiate writeback if mapping has no dirty pages	2019-11-12 19:21:20 +01:00
frame_vector.c
frontswap.c	mm: use octal not symbolic permissions	2018-06-15 07:55:25 +09:00
gup.c	mm/gup.c: remove some BUG_ONs from get_gate_page()	2019-07-31 07:27:08 +02:00
gup_benchmark.c	mm/gup_benchmark.c: prevent integer overflow in ioctl	2019-12-01 09:17:07 +01:00
highmem.c
hmm.c	mm/memory_hotplug: shrink zones when offlining memory	2020-01-29 16:43:27 +01:00
huge_memory.c	mm/huge_memory.c: thp: fix conflict of above-47bit hint address and PMD alignment	2020-01-23 08:21:32 +01:00
hugetlb.c	hugetlbfs: don't access uninitialized memmaps in pfn_range_valid_gigantic()	2019-10-29 09:19:59 +01:00
hugetlb_cgroup.c	mm: hugetlb: switch to css_tryget() in hugetlb_cgroup_charge_cgroup()	2019-11-20 18:45:20 +01:00
hwpoison-inject.c	mm/memory_failure: Remove unused trapno from memory_failure	2018-01-23 12:17:42 -06:00
init-mm.c	mm: Allocate the mm_cpumask (mm->cpu_bitmap[]) dynamically based on nr_cpu_ids	2018-07-17 09:35:30 +02:00
internal.h	vmscan: return NODE_RECLAIM_NOSCAN in node_reclaim() when CONFIG_NUMA is n	2019-12-05 09:20:57 +01:00
interval_tree.c	mm/interval_tree.c: use vma_pages() helper	2018-01-31 17:18:37 -08:00
Kconfig	mm/hmm: select mmu notifier when selecting HMM	2019-06-15 11:54:00 +02:00
Kconfig.debug	mm: clarify CONFIG_PAGE_POISONING and usage	2018-08-22 10:52:44 -07:00
khugepaged.c	coredump: fix race condition between collapse_huge_page() and core dumping	2019-06-22 08:15:21 +02:00
kmemleak-test.c
kmemleak.c	Revert "kmemleak: allow to coexist with fault injection"	2019-08-25 10:47:58 +02:00
ksm.c	mm/ksm.c: don't WARN if page is still mapped in remove_stable_node()	2019-12-01 09:16:11 +01:00
list_lru.c	mm/list_lru.c: fix memory leak in __memcg_init_list_lru_node	2019-06-19 08:17:59 +02:00
maccess.c	mm: docs: fix parameter names mismatch	2018-02-06 18:32:48 -08:00
madvise.c	mm: madvise(MADV_DODUMP): allow hugetlbfs pages	2018-10-05 16:32:05 -07:00
Makefile	vfs: implement readahead(2) using POSIX_FADV_WILLNEED	2018-08-30 20:01:32 +02:00
memblock.c	mm/page_alloc.c: deduplicate __memblock_free_early() and memblock_free()	2019-12-05 09:20:58 +01:00
memcontrol.c	mm: handle no memcg case in memcg_kmem_charge() properly	2019-12-01 09:17:14 +01:00
memfd.c	memfd: Use radix_tree_deref_slot_protected to avoid the warning.	2019-11-20 18:47:53 +01:00
memory-failure.c	mm/memory-failure: poison read receives SIGKILL instead of SIGBUS if mmaped more than once	2019-10-29 09:19:59 +01:00
memory.c	mm, thp, proc: report THP eligibility for each vma	2019-12-17 20:35:45 +01:00
memory_hotplug.c	mm/memory_hotplug: fix remove_memory() lockdep splat	2020-02-11 04:33:56 -08:00
mempolicy.c	mm/mempolicy.c: fix out of bounds write in mpol_parse_str()	2020-02-05 14:43:36 +00:00
mempool.c	mm/mempool.c: add missing parameter description	2018-08-22 10:52:44 -07:00
memtest.c
migrate.c	mm: move_pages: report the number of non-attempted pages	2020-02-11 04:33:56 -08:00
mincore.c	mm/mincore.c: make mincore() more conservative	2019-05-22 07:37:40 +02:00
mlock.c	mm/mlock.c: change count_mm_mlocked_page_nr return type	2019-07-10 09:53:40 +02:00
mm_init.c	mm: access zone->node via zone_to_nid() and zone_set_nid()	2018-08-22 10:52:45 -07:00
mmap.c	arm64: Revert support for execute-only user mappings	2020-01-09 10:19:03 +01:00
mmu_context.c
mmu_notifier.c	mm/mmu_notifier: use hlist_add_head_rcu()	2019-07-31 07:27:08 +02:00
mmzone.c
mprotect.c	x86/speculation/l1tf: Disallow non privileged high MMIO PROT_NONE mappings	2018-06-20 19:10:01 +02:00
mremap.c	mremap: properly flush TLB before releasing the page	2018-10-18 11:30:52 +02:00
msync.c
nobootmem.c	mm/memblock: add a name for memblock flags enumeration	2018-08-02 12:17:27 -06:00
nommu.c	mm: use down_read_killable for locking mmap_sem in access_remote_vm	2019-07-31 07:27:09 +02:00
oom_kill.c	memcg, oom: don't require __GFP_FS when invoking memcg OOM killer	2019-10-05 13:10:07 +02:00
page-writeback.c	mm/page-writeback.c: avoid potential division by zero in wb_min_max_ratio()	2020-01-23 08:21:31 +01:00
page_alloc.c	mm/page_alloc.c: use a single function to free page	2019-12-05 09:20:58 +01:00
page_counter.c	memcg: introduce memory.min	2018-06-07 17:34:36 -07:00
page_ext.c	mm/page_ext.c: fix an imbalance with kmemleak	2019-04-05 22:32:58 +02:00
page_idle.c	mm/page_idle.c: fix oops because end_pfn is larger than max_pfn	2019-07-03 13:14:45 +02:00
page_io.c	mm/page_io.c: do not free shared swap slots	2019-12-01 09:17:35 +01:00
page_isolation.c	mm, migrate: remove reason argument from new_page_t	2018-04-11 10:28:32 -07:00
page_owner.c	mm/page_owner: don't access uninitialized memmaps when reading /proc/pagetypeinfo	2019-10-29 09:19:58 +01:00
page_poison.c	page_poison: play nicely with KASAN	2019-04-05 22:32:59 +02:00
page_vma_mapped.c	mm/rmap: map_pte() was not handling private ZONE_DEVICE page properly	2018-11-13 11:08:46 -08:00
pagewalk.c	mm: kernel-doc: add missing parameter descriptions	2018-04-05 21:36:27 -07:00
percpu-internal.h
percpu-km.c	percpu: convert spin_lock_irq to spin_lock_irqsave.	2019-02-12 19:47:12 +01:00
percpu-stats.c	treewide: Use array_size() in vmalloc()	2018-06-12 16:19:22 -07:00
percpu-vm.c	percpu: allow select gfp to be passed to underlying allocators	2018-02-18 05:33:01 -08:00
percpu.c	percpu: do not search past bitmap when allocating an area	2019-06-15 11:54:11 +02:00
pgtable-generic.c	mm: do not lose dirty and accessed bits in pmdp_invalidate()	2018-01-31 17:18:38 -08:00
process_vm_access.c	mm: docs: add blank lines to silence sphinx "Unexpected indentation" errors	2018-02-06 18:32:48 -08:00
quicklist.c
readahead.c	vfs: implement readahead(2) using POSIX_FADV_WILLNEED	2018-08-30 20:01:32 +02:00
rmap.c	mm/hmm: fix bad subpage pointer in try_to_unmap_one	2019-08-25 10:47:43 +02:00
rodata_test.c
shmem.c	mm/shmem.c: thp, shmem: fix conflict of above-47bit hint address and PMD alignment	2020-01-23 08:21:30 +01:00
slab.c	mm/slab.c: fix an infinite loop in leaks_show()	2019-06-15 11:54:01 +02:00
slab.h	mm: add support for kmem caches in DMA32 zone	2019-04-03 06:26:28 +02:00
slab_common.c	mm: memcg/slab: call flush_memcg_workqueue() only if memcg workqueue is valid	2020-01-23 08:21:30 +01:00
slob.c	slab: __GFP_ZERO is incompatible with a constructor	2018-06-07 17:34:34 -07:00
slub.c	mm/slub: fix a deadlock in show_slab_objects()	2019-10-29 09:19:58 +01:00
sparse-vmemmap.c	mm/sparse: delete old sparse_init and enable new one	2018-08-17 16:20:32 -07:00
sparse.c	mm/memory_hotplug: remove "zone" parameter from sparse_remove_one_section	2020-01-29 16:43:26 +01:00
swap.c	mm/swap: fix release_pages() when releasing devmap pages	2019-07-31 07:27:03 +02:00
swap_cgroup.c
swap_slots.c	mm, swap, get_swap_pages: use entry_size instead of cluster in parameter	2018-08-22 10:52:44 -07:00
swap_state.c	treewide: kvzalloc() -> kvcalloc()	2018-06-12 16:19:22 -07:00
swapfile.c	mm, swap: bounds check swap_info array accesses to avoid NULL derefs	2019-04-05 22:32:58 +02:00
truncate.c	mm: cleancache: fix corruption on missed inode invalidation	2018-12-05 19:32:13 +01:00
usercopy.c	usercopy: Avoid HIGHMEM pfn warning	2019-10-11 18:20:58 +02:00
userfaultfd.c	hugetlb: use same fault hash key for shared and private mappings	2019-05-22 07:37:40 +02:00
util.c	mm: page_mapped: don't assume compound page is huge or THP	2019-01-16 22:04:36 +01:00
vmacache.c	mm: get rid of vmacache_flush_all() entirely	2018-09-13 15:18:04 -10:00
vmalloc.c	mm/vmalloc: Sync unmappings in __purge_vmap_area_lazy()	2019-08-16 10:12:40 +02:00
vmpressure.c	mm/vmpressure.c: fix a signedness bug in vmpressure_register_event()	2019-10-17 13:45:19 -07:00
vmscan.c	mm: vmscan: check if mem cgroup is disabled or not before calling memcg slab shrinker	2019-08-06 19:06:54 +02:00
vmstat.c	mm/vmstat.c: fix NUMA statistics updates	2019-12-13 08:51:27 +01:00
workingset.c	mm/list_lru: introduce list_lru_shrink_walk_irq()	2018-08-17 16:20:32 -07:00
z3fold.c	z3fold: fix possible reclaim races	2018-12-01 09:37:33 +01:00
zbud.c	mm: docs: fix parameter names mismatch	2018-02-06 18:32:48 -08:00
zpool.c	mm/zpool.c: zpool_evictable: fix mismatch in parameter name and kernel-doc	2018-02-21 15:35:43 -08:00
zsmalloc.c	mm/zsmalloc.c: fix the migrated zspage statistics.	2020-01-09 10:19:00 +01:00
zswap.c	zswap: re-check zswap_is_full() after do zswap_shrink()	2018-07-26 19:38:03 -07:00