Linus Torvalds 00a3d660cb Revert "fs: do not prefault sys_write() user buffer pages" ... This reverts commit 998ef75ddb. The commit itself does not appear to be buggy per se, but it is exposing a bug in ext4 (and Ted thinks ext3 too, but we solved that by getting rid of it). It's too late in the release cycle to really worry about this, even if Dave Hansen has a patch that may actually fix the underlying ext4 problem. We can (and should) revisit this for the next release. The problem is that moving the prefaulting later now exposes a special case with partially successful writes that isn't handled correctly. And the prefaulting likely isn't normally even that much of a performance issue - it looks like at least one reason Dave saw this in his performance tests is that he also ran them on Skylake that now supports the new SMAP code, which makes the normally very cheap user space prefaulting noticeably more expensive. Bisected-and-acked-by: Ted Ts'o <tytso@mit.edu> Analyzed-and-acked-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2015-10-07 08:32:38 +01:00
..
kasan	kasan: fix last shadow judgement in memory_is_poisoned_16()	2015-09-17 21:16:07 -07:00
backing-dev.c	Merge branch 'for-4.3/blkcg' of git://git.kernel.dk/linux-block	2015-09-10 18:56:14 -07:00
balloon_compaction.c
bootmem.c	bootmem: avoid freeing to bootmem after bootmem is done	2015-09-08 15:35:28 -07:00
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c	mm/compaction: correct to flush migrated pages if pageblock skip happens	2015-09-08 15:35:28 -07:00
debug-pagealloc.c
debug.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
dmapool.c	dmapool: fix overflow condition in pool_find_page()	2015-10-01 21:42:35 -04:00
early_ioremap.c	mm/early_ioremap: add explicit #include of asm/early_ioremap.h	2015-09-11 15:21:34 -07:00
fadvise.c
failslab.c
filemap.c	Revert "fs: do not prefault sys_write() user buffer pages"	2015-10-07 08:32:38 +01:00
frame_vector.c
frontswap.c
gup.c	mm: make GUP handle pfn mapping unless FOLL_GET is requested	2015-09-04 16:54:41 -07:00
highmem.c
huge_memory.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
hugetlb_cgroup.c
hugetlb.c	mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault	2015-10-01 21:42:35 -04:00
hwpoison-inject.c	hwpoison: use page_cgroup_ino for filtering by memcg	2015-09-10 13:29:01 -07:00
init-mm.c
internal.h	mm/compaction: correct to flush migrated pages if pageblock skip happens	2015-09-08 15:35:28 -07:00
interval_tree.c
Kconfig	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c	kmemleak: use seq_hex_dump() to dump buffers	2015-09-10 13:29:01 -07:00
ksm.c
list_lru.c	list_lru: don't call list_lru_from_kmem if the list_head is empty	2015-09-08 15:35:28 -07:00
maccess.c
madvise.c	mm: madvise allow remove operation for hugetlbfs	2015-09-08 15:35:28 -07:00
Makefile	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
memblock.c	mm/memblock.c: fix comment in __next_mem_range()	2015-09-08 15:35:28 -07:00
memcontrol.c	memcg: remove pcp_counter_lock	2015-10-01 21:42:35 -04:00
memory_hotplug.c	libnvdimm for 4.3:	2015-09-08 14:35:59 -07:00
memory-failure.c	hwpoison: use page_cgroup_ino for filtering by memcg	2015-09-10 13:29:01 -07:00
memory.c	mm: use vma_is_anonymous() in create_huge_pmd() and wp_huge_pmd()	2015-09-10 13:29:01 -07:00
mempolicy.c	mm: rename alloc_pages_exact_node() to __alloc_pages_node()	2015-09-08 15:35:28 -07:00
mempool.c	mm/mempool: allow NULL `pool' pointer in mempool_destroy()	2015-09-08 15:35:28 -07:00
memtest.c	memtest: remove unused header files	2015-09-08 15:35:28 -07:00
migrate.c	memcg: fix dirty page migration	2015-10-01 21:42:35 -04:00
mincore.c
mlock.c	userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx	2015-09-04 16:54:41 -07:00
mm_init.c
mmap.c	mm, dax: VMA with vm_ops->pfn_mkwrite wants to be write-notified	2015-09-22 15:09:53 -07:00
mmu_context.c
mmu_notifier.c	mmu-notifier: add clear_young callback	2015-09-10 13:29:01 -07:00
mmzone.c
mprotect.c	userfaultfd: teach vma_merge to merge across vma->vm_userfaultfd_ctx	2015-09-04 16:54:41 -07:00
mremap.c	mremap: simplify the "overlap" check in mremap_to()	2015-09-04 16:54:41 -07:00
msync.c
nobootmem.c
nommu.c	mm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff()	2015-09-10 13:29:01 -07:00
oom_kill.c	mm, oom: remove unnecessary variable	2015-09-08 15:35:28 -07:00
page_alloc.c	Merge branch 'akpm' (patches from Andrew)	2015-09-08 17:52:23 -07:00
page_counter.c
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
page_isolation.c	mm, page_isolation: make set/unset_migratetype_isolate() file-local	2015-09-08 15:35:28 -07:00
page_owner.c
page-writeback.c	Merge branch 'for-4.3/blkcg' of git://git.kernel.dk/linux-block	2015-09-10 18:56:14 -07:00
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -07:00
shmem.c	shmem: recalculate file inode when fstat	2015-09-08 15:35:28 -07:00
slab_common.c	memcg: export struct mem_cgroup	2015-09-08 15:35:28 -07:00
slab.c	mm/slab: fix unexpected index mapping result of kmalloc_size(INDEX_NODE+1)	2015-10-01 21:42:35 -04:00
slab.h	mm/slab.h: fix argument order in cache_from_obj's error message	2015-09-04 16:54:41 -07:00
slob.c	mm: rename alloc_pages_exact_node() to __alloc_pages_node()	2015-09-08 15:35:28 -07:00
slub.c	mm: rename alloc_pages_exact_node() to __alloc_pages_node()	2015-09-08 15:35:28 -07:00
sparse-vmemmap.c
sparse.c
swap_cgroup.c
swap_state.c	mm: swap: zswap: maybe_preload & refactoring	2015-09-08 15:35:28 -07:00
swap.c	mm: introduce idle page tracking	2015-09-10 13:29:01 -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
userfaultfd.c	userfaultfd: avoid mmap_sem read recursion in mcopy_atomic	2015-09-04 16:54:41 -07:00
util.c
vmacache.c
vmalloc.c
vmpressure.c
vmscan.c	vmscan: fix sane_reclaim helper for legacy memcg	2015-09-22 15:09:53 -07:00
vmstat.c
workingset.c
zbud.c	mm: zbud: constify the zbud_ops	2015-09-08 15:35:28 -07:00
zpool.c	zpool: add zpool_has_pool()	2015-09-10 13:29:01 -07:00
zsmalloc.c	mm: zpool: constify the zpool_ops	2015-09-08 15:35:28 -07:00
zswap.c	zswap: change zpool/compressor at runtime	2015-09-10 13:29:01 -07:00