Mike Kravetz 749df87bd7 mm/shmem: add hugetlbfs support to memfd_create() ... This patch came out of discussions in this e-mail thread: http://lkml.kernel.org/r/1499357846-7481-1-git-send-email-mike.kravetz%40oracle.com The Oracle JVM team is developing a new garbage collection model. This new model requires multiple mappings of the same anonymous memory. One straight forward way to accomplish this is with memfd_create. They can use the returned fd to create multiple mappings of the same memory. The JVM today has an option to use (static hugetlb) huge pages. If this option is specified, they would like to use the same garbage collection model requiring multiple mappings to the same memory. Using hugetlbfs, it is possible to explicitly mount a filesystem and specify file paths in order to get an fd that can be used for multiple mappings. However, this introduces additional system admin work and coordination. Ideally they would like to get a hugetlbfs fd without requiring explicit mounting of a filesystem. Today, mmap and shmget can make use of hugetlbfs without explicitly mounting a filesystem. The patch adds this functionality to memfd_create. Add a new flag MFD_HUGETLB to memfd_create() that will specify the file to be created resides in the hugetlbfs filesystem. This is the generic hugetlbfs filesystem not associated with any specific mount point. As with other system calls that request hugetlbfs backed pages, there is the ability to encode huge page size in the flag arguments. hugetlbfs does not support sealing operations, therefore specifying MFD_ALLOW_SEALING with MFD_HUGETLB will result in EINVAL. Of course, the memfd_man page would need updating if this type of functionality moves forward. Link: http://lkml.kernel.org/r/1502149672-7759-2-git-send-email-mike.kravetz@oracle.com Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Hugh Dickins <hughd@google.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2017-09-06 17:27:29 -07:00
..
kasan	Merge branch 'linus' into locking/core, to pick up fixes	2017-08-10 12:20:53 +02:00
backing-dev.c	bdi: Drop 'parent' argument from bdi_register[_va]()	2017-04-20 12:09:55 -06:00
balloon_compaction.c	mm/balloon_compaction.c: don't zero ballooned pages	2017-08-10 15:54:07 -07:00
bootmem.c	mm/bootmem.c: cosmetic improvement of code readability	2017-02-22 16:41:29 -08:00
cleancache.c	fs: switch ->s_uuid to uuid_t	2017-06-05 16:59:12 +02:00
cma_debug.c	mm/cma_debug.c: fix stack corruption due to sprintf usage	2017-08-18 15:32:02 -07:00
cma.c	cma: fix calculation of aligned offset	2017-07-10 16:32:32 -07:00
cma.h	cma: Store a name in the cma structure	2017-04-18 20:41:12 +02:00
compaction.c	mm, compaction: skip over holes in __reset_isolation_suitable	2017-07-06 16:24:32 -07:00
debug_page_ref.c
debug.c	mm: make tlb_flush_pending global	2017-08-10 15:54:07 -07:00
dmapool.c	lib/vsprintf.c: remove %Z support	2017-02-27 18:43:47 -08:00
early_ioremap.c	x86/mm: Add support to access boot related data in the clear	2017-07-18 11:38:02 +02:00
fadvise.c	mm: fadvise: avoid expensive remote LRU cache draining after FADV_DONTNEED	2016-12-20 09:48:46 -08:00
failslab.c
filemap.c	mm: use find_get_pages_range() in filemap_range_has_page()	2017-09-06 17:27:27 -07:00
frame_vector.c	treewide: use kv[mz]alloc* rather than opencoded variants	2017-05-08 17:15:13 -07:00
frontswap.c
gup.c	mm/gup: make __gup_device_* require THP	2017-09-06 17:27:26 -07:00
highmem.c
huge_memory.c	mm, THP, swap: support splitting THP for THP swap out	2017-09-06 17:27:28 -07:00
hugetlb_cgroup.c
hugetlb.c	mm, hugetlb: do not allocate non-migrateable gigantic pages from movable zones	2017-09-06 17:27:29 -07:00
hwpoison-inject.c	mm: hwpoison: call shake_page() unconditionally	2017-05-03 15:52:12 -07:00
init-mm.c	mm: Add a user_ns owner to mm_struct and fix ptrace permission checks	2016-11-22 11:49:48 -06:00
internal.h	mm, memory_hotplug: drop zone from build_all_zonelists	2017-09-06 17:27:25 -07:00
interval_tree.c
Kconfig	mm, devm_memremap_pages: use multi-order radix for ZONE_DEVICE lookups	2017-09-06 17:27:29 -07:00
Kconfig.debug	mm: enable page poisoning early at boot	2017-05-03 15:52:10 -07:00
khugepaged.c	mm: make PR_SET_THP_DISABLE immediately active	2017-07-10 16:32:31 -07:00
kmemcheck.c	mm: Rename SLAB_DESTROY_BY_RCU to SLAB_TYPESAFE_BY_RCU	2017-04-18 11:42:36 -07:00
kmemleak-test.c
kmemleak.c	mm: kmemleak: treat vm_struct as alternative reference to vmalloc'ed objects	2017-07-06 16:24:34 -07:00
ksm.c	mm/ksm.c: constify attribute_group structures	2017-09-06 17:27:27 -07:00
list_lru.c	mm/list_lru.c: fix list_lru_count_node() to be race free	2017-07-10 16:32:33 -07:00
maccess.c
madvise.c	mm, madvise: ensure poisoned pages are removed from per-cpu lists	2017-08-31 16:33:15 -07:00
Makefile	percpu: expose statistics about percpu memory via debugfs	2017-06-20 15:31:38 -04:00
memblock.c	mm/memblock.c: reversed logic in memblock_discard()	2017-08-25 16:12:46 -07:00
memcontrol.c	memcg, THP, swap: make mem_cgroup_swapout() support THP	2017-09-06 17:27:28 -07:00
memory_hotplug.c	mm, memory_hotplug: get rid of zonelists_mutex	2017-09-06 17:27:26 -07:00
memory-failure.c	x86/mm, mm/hwpoison: Clear PRESENT bit for kernel 1:1 mappings of poison pages	2017-08-17 10:30:49 +02:00
memory.c	mm, THP, swap: make reuse_swap_page() works for THP swapped out	2017-09-06 17:27:27 -07:00
mempolicy.c	mm/mempolicy: fix use after free when calling get_mempolicy	2017-08-18 15:32:02 -07:00
mempool.c	sched/wait: Rename wait_queue_t => wait_queue_entry_t	2017-06-20 12:18:27 +02:00
memtest.c
migrate.c	Sanitize 'move_pages()' permission checks	2017-08-20 13:26:27 -07:00
mincore.c	mm: remove shmem_mapping() shmem_zero_setup() duplicates	2017-02-24 17:46:56 -08:00
mlock.c	mlock: fix mlock count can not decrease in race condition	2017-06-02 15:07:38 -07:00
mm_init.c
mmap.c	userfaultfd: call userfaultfd_unmap_prep only if __split_vma succeeds	2017-09-06 17:27:29 -07:00
mmu_context.c	sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
mmu_notifier.c	mm/mmu_notifier: kill invalidate_page	2017-08-31 16:13:00 -07:00
mmzone.c	mm/mmzone.c: swap likely to unlikely as code logic is different for next_zones_zonelist()	2017-02-22 16:41:29 -08:00
mprotect.c	mm: migrate: prevent racy access to tlb_flush_pending	2017-08-10 15:54:07 -07:00
mremap.c	mm/mremap: fail map duplication attempts for private mappings	2017-09-06 17:27:26 -07:00
msync.c
nobootmem.c	mm: discard memblock data later	2017-08-18 15:32:01 -07:00
nommu.c	mm: rename global_page_state to global_zone_page_state	2017-09-06 17:27:29 -07:00
oom_kill.c	mm/oom_kill.c: add tracepoints for oom reaper-related events	2017-07-10 16:32:32 -07:00
page_alloc.c	mm: rename global_page_state to global_zone_page_state	2017-09-06 17:27:29 -07:00
page_counter.c
page_ext.c	mm, page_ext: periodically reschedule during page_ext_init()	2017-09-06 17:27:26 -07:00
page_idle.c	mm/page_idle.c: constify attribute_group structures	2017-09-06 17:27:27 -07:00
page_io.c	mm: test code to write THP to swap device as a whole	2017-09-06 17:27:28 -07:00
page_isolation.c	mm: unify new_node_page and alloc_migrate_target	2017-07-10 16:32:31 -07:00
page_owner.c	mm, page_owner: don't grab zone->lock for init_pages_in_zone()	2017-09-06 17:27:26 -07:00
page_poison.c	mm: enable page poisoning early at boot	2017-05-03 15:52:10 -07:00
page_vma_mapped.c	mm/hugetlb: add size parameter to huge_pte_offset()	2017-07-06 16:24:34 -07:00
page-writeback.c	mm: rename global_page_state to global_zone_page_state	2017-09-06 17:27:29 -07:00
pagewalk.c	mm/hugetlb: add size parameter to huge_pte_offset()	2017-07-06 16:24:34 -07:00
percpu-internal.h	percpu: fix early calls for spinlock in pcpu_stats	2017-06-21 13:53:52 -04:00
percpu-km.c	percpu: fix static checker warnings in pcpu_destroy_chunk	2017-06-29 11:23:38 -04:00
percpu-stats.c	percpu: expose statistics about percpu memory via debugfs	2017-06-20 15:31:38 -04:00
percpu-vm.c	percpu: fix static checker warnings in pcpu_destroy_chunk	2017-06-29 11:23:38 -04:00
percpu.c	percpu: resolve err may not be initialized in pcpu_alloc	2017-06-21 12:00:45 -04:00
pgtable-generic.c	mm: convert generic code to 5-level paging	2017-03-09 11:48:47 -08:00
process_vm_access.c	sched/headers: Prepare for new header dependencies before moving code to <linux/sched/mm.h>	2017-03-02 08:42:28 +01:00
quicklist.c
readahead.c	mm: don't cap request size based on read-ahead setting	2016-12-12 18:55:08 -08:00
rmap.c	mm/rmap: update to new mmu_notifier semantic v2	2017-08-31 16:12:59 -07:00
rodata_test.c	mm: remove rodata_test_data export, add pr_fmt	2017-05-03 15:52:09 -07:00
shmem.c	mm/shmem: add hugetlbfs support to memfd_create()	2017-09-06 17:27:29 -07:00
slab_common.c	mm: allow slab_nomerge to be set at build time	2017-07-06 16:24:31 -07:00
slab.c	mm: memcontrol: account slab stats per lruvec	2017-07-06 16:24:35 -07:00
slab.h	locking/lockdep: Rework FS_RECLAIM annotation	2017-08-10 12:29:03 +02:00
slob.c	locking/lockdep: Rework FS_RECLAIM annotation	2017-08-10 12:29:03 +02:00
slub.c	mm/slub.c: constify attribute_group structures	2017-09-06 17:27:27 -07:00
sparse-vmemmap.c	mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations	2017-09-06 17:27:26 -07:00
sparse.c	mm, sparse, page_ext: drop ugly N_HIGH_MEMORY branches for allocations	2017-09-06 17:27:26 -07:00
swap_cgroup.c	mm, THP, swap: delay splitting THP during swap out	2017-07-06 16:24:31 -07:00
swap_slots.c	mm/swap_slots.c: don't disable preemption while taking the per-CPU cache	2017-07-10 16:32:32 -07:00
swap_state.c	swap: add block io poll in swapin path	2017-07-10 16:32:30 -07:00
swap.c	mm: remove nr_pages argument from pagevec_lookup{,_range}()	2017-09-06 17:27:27 -07:00
swapfile.c	mm, THP, swap: support splitting THP for THP swap out	2017-09-06 17:27:28 -07:00
truncate.c	mm/truncate.c: fix THP handling in invalidate_mapping_pages()	2017-07-10 16:32:32 -07:00
usercopy.c	mm/usercopy: Drop extra is_vmalloc_or_module() check	2017-04-05 12:30:18 -07:00
userfaultfd.c	userfaultfd: shmem: wire up shmem_mfill_zeropage_pte	2017-09-06 17:27:28 -07:00
util.c	mm: rename global_page_state to global_zone_page_state	2017-09-06 17:27:29 -07:00
vmacache.c	sched/headers: Prepare to move 'init_task' and 'init_thread_union' from <linux/sched.h> to <linux/sched/task.h>	2017-03-02 08:42:38 +01:00
vmalloc.c	mm/vmalloc.c: halve the number of comparisons performed in pcpu_get_vm_areas()	2017-09-06 17:27:29 -07:00
vmpressure.c	mm, vmpressure: pass-through notification support	2017-07-10 16:32:31 -07:00
vmscan.c	mm, THP, swap: add THP swapping out fallback counting	2017-09-06 17:27:28 -07:00
vmstat.c	mm/vmstat: fix divide error at __fragmentation_index	2017-09-06 17:27:29 -07:00
workingset.c	mm: memcontrol: per-lruvec stats infrastructure	2017-07-06 16:24:35 -07:00
z3fold.c	z3fold: fix page locking in z3fold_alloc()	2017-04-13 18:24:20 -07:00
zbud.c
zpool.c
zsmalloc.c	zsmalloc: zs_page_migrate: skip unnecessary loops but not return -EBUSY if zspage is not inuse	2017-09-06 17:27:26 -07:00
zswap.c	mm/zswap.c: delete an error message for a failed memory allocation in zswap_dstmem_prepare()	2017-07-06 16:24:35 -07:00