Kirill A. Shutemov 33041a0d76 mm: mark remap_file_pages() syscall as deprecated ... The remap_file_pages() system call is used to create a nonlinear mapping, that is, a mapping in which the pages of the file are mapped into a nonsequential order in memory. The advantage of using remap_file_pages() over using repeated calls to mmap(2) is that the former approach does not require the kernel to create additional VMA (Virtual Memory Area) data structures. Supporting of nonlinear mapping requires significant amount of non-trivial code in kernel virtual memory subsystem including hot paths. Also to get nonlinear mapping work kernel need a way to distinguish normal page table entries from entries with file offset (pte_file). Kernel reserves flag in PTE for this purpose. PTE flags are scarce resource especially on some CPU architectures. It would be nice to free up the flag for other usage. Fortunately, there are not many users of remap_file_pages() in the wild. It's only known that one enterprise RDBMS implementation uses the syscall on 32-bit systems to map files bigger than can linearly fit into 32-bit virtual address space. This use-case is not critical anymore since 64-bit systems are widely available. The plan is to deprecate the syscall and replace it with an emulation. The emulation will create new VMAs instead of nonlinear mappings. It's going to work slower for rare users of remap_file_pages() but ABI is preserved. One side effect of emulation (apart from performance) is that user can hit vm.max_map_count limit more easily due to additional VMAs. See comment for DEFAULT_MAX_MAP_COUNT for more details on the limit. [akpm@linux-foundation.org: fix spello] Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Dave Jones <davej@redhat.com> Cc: Armin Rigo <arigo@tunes.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2014-06-06 16:08:17 -07:00
..
backing-dev.c	arch: Mass conversion of smp_mb__*()	2014-04-18 14:20:48 +02:00
balloon_compaction.c	mm: print more details for bad_page()	2014-01-23 16:36:50 -08:00
bootmem.c	mm/bootmem.c: remove unused local `map'	2013-11-13 12:09:09 +09:00
cleancache.c	mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON_PAGE	2014-01-23 16:36:50 -08:00
compaction.c	mm, compaction: properly signal and act upon lock and need_sched() contention	2014-06-04 16:54:11 -07:00
debug-pagealloc.c
dmapool.c	mm/dmapool.c: reuse devres_release() to free resources	2014-06-04 16:54:08 -07:00
early_ioremap.c	mm: create generic early_ioremap() support	2014-04-07 16:36:15 -07:00
fadvise.c	teach SYSCALL_DEFINE<n> how to deal with long long/unsigned long long	2013-03-03 22:46:22 -05:00
failslab.c
filemap_xip.c	seqcount: Add lockdep functionality to seqcount/seqlock structures	2013-11-06 12:40:26 +01:00
filemap.c	mm: avoid unnecessary atomic operations during end_page_writeback()	2014-06-04 16:54:10 -07:00
fremap.c	mm: mark remap_file_pages() syscall as deprecated	2014-06-06 16:08:17 -07:00
frontswap.c	swap: change swap_list_head to plist, add swap_avail_head	2014-06-04 16:54:07 -07:00
gup.c	mm: cleanup __get_user_pages()	2014-06-04 16:54:05 -07:00
highmem.c
huge_memory.c	mm/huge_memory.c: complete conversion to pr_foo()	2014-06-04 16:53:58 -07:00
hugetlb_cgroup.c	cgroup: drop const from @buffer of cftype->write_string()	2014-03-19 10:23:54 -04:00
hugetlb.c	hugetlb: rename hugepage_migration_support() to ..._supported()	2014-06-04 16:54:12 -07:00
hwpoison-inject.c	mm/hwpoison: add '#' to hwpoison_inject	2014-01-21 16:19:48 -08:00
init-mm.c
internal.h	mm, compaction: properly signal and act upon lock and need_sched() contention	2014-06-04 16:54:11 -07:00
interval_tree.c
iov_iter.c	take iov_iter stuff to mm/iov_iter.c	2014-04-01 23:19:30 -04:00
Kconfig	mm/zsmalloc: make zsmalloc module-buildable	2014-06-04 16:54:14 -07:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c	mm: introduce kmemleak_update_trace()	2014-06-06 16:08:17 -07:00
ksm.c	mm: close PageTail race	2014-03-04 07:55:47 -08:00
list_lru.c	mm: keep page cache radix tree nodes in check	2014-04-03 16:21:01 -07:00
maccess.c
madvise.c	mm: madvise: fix MADV_WILLNEED on shmem swapouts	2014-05-23 09:37:29 -07:00
Makefile	mm: move get_user_pages()-related code to separate file	2014-06-04 16:54:04 -07:00
memblock.c	mm/memblock.c: call kmemleak directly from memblock_(alloc|free)	2014-06-06 16:08:17 -07:00
memcontrol.c	mm: memcontrol: remove unnecessary memcg argument from soft limit functions	2014-06-06 16:08:17 -07:00
memory_hotplug.c	mm, migration: add destination page freeing callback	2014-06-04 16:54:06 -07:00
memory-failure.c	mm/memory-failure.c: support use of a dedicated thread to handle SIGBUS(BUS_MCEERR_AO)	2014-06-04 16:54:13 -07:00
memory.c	mm: document do_fault_around() feature	2014-06-04 16:54:12 -07:00
mempolicy.c	mm, migration: add destination page freeing callback	2014-06-04 16:54:06 -07:00
mempool.c	mm/mempool.c: update the kmemleak stack trace for mempool allocations	2014-06-06 16:08:17 -07:00
migrate.c	hugetlb: rename hugepage_migration_support() to ..._supported()	2014-06-04 16:54:12 -07:00
mincore.c	mm + fs: prepare for non-page entries in page cache radix trees	2014-04-03 16:21:00 -07:00
mlock.c	mm: try_to_unmap_cluster() should lock_page() before mlocking	2014-04-07 16:35:57 -07:00
mm_init.c	mm: bring back /sys/kernel/mm	2014-01-27 21:02:39 -08:00
mmap.c	Merge branch 'x86/vdso' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip into next	2014-06-05 08:05:29 -07:00
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	mm: audit/fix non-modular users of module_init in core code	2014-01-23 16:36:52 -08:00
mmzone.c	mm: numa: Change page last {nid,pid} into {cpu,pid}	2013-10-09 14:47:45 +02:00
mprotect.c	mm: move mmu notifier call from change_protection to change_pmd_range	2014-04-07 16:35:50 -07:00
mremap.c	mm, thp: close race between mremap() and split_huge_page()	2014-05-11 17:55:48 +09:00
msync.c	mm/msync.c: sync only the requested range in msync()	2014-06-04 16:54:11 -07:00
nobootmem.c	mm/memblock.c: call kmemleak directly from memblock_(alloc|free)	2014-06-06 16:08:17 -07:00
nommu.c	mm: fix 'ERROR: do not initialise globals to 0 or NULL' and coding style	2014-04-07 16:35:55 -07:00
oom_kill.c	mm, oom: base root bonus on current usage	2014-01-30 16:56:56 -08:00
page_alloc.c	mm: convert use of typedef ctl_table to struct ctl_table	2014-06-06 16:08:16 -07:00
page_cgroup.c	mm/page_cgroup.c: mark functions as static	2014-04-03 16:21:02 -07:00
page_io.c	swap: use bdev_read_page() / bdev_write_page()	2014-06-04 16:54:02 -07:00
page_isolation.c	mm: memory-hotplug: enable memory hotplug to handle hugepage	2013-09-11 15:57:48 -07:00
page-writeback.c	mm: convert use of typedef ctl_table to struct ctl_table	2014-06-06 16:08:16 -07:00
pagewalk.c	mm/pagewalk.c: fix walk_page_range() access of wrong PTEs	2013-10-30 14:27:03 -07:00
percpu-km.c
percpu-vm.c
percpu.c	percpu: make pcpu_alloc_chunk() use pcpu_mem_free() instead of kfree()	2014-04-14 16:18:06 -04:00
pgtable-generic.c	mm: fix TLB flush race between migration, and change_protection_range	2013-12-18 19:04:51 -08:00
process_vm_access.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2014-04-12 14:49:50 -07:00
quicklist.c
readahead.c	mm/readahead.c: inline ra_submit	2014-04-07 16:35:58 -07:00
rmap.c	mm/rmap.c: cleanup ttu_flags	2014-06-04 16:54:12 -07:00
shmem.c	mm: non-atomically mark page accessed during page cache allocation where possible	2014-06-04 16:54:10 -07:00
slab_common.c	slab: delete cache from list after __kmem_cache_shutdown succeeds	2014-06-04 16:54:08 -07:00
slab.c	memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab	2014-06-04 16:54:01 -07:00
slab.h	memcg, slab: merge memcg_{bind,release}_pages to memcg_{un}charge_slab	2014-06-04 16:54:01 -07:00
slob.c	slab: get_online_mems for kmem_cache_{create,destroy,shrink}	2014-06-04 16:53:59 -07:00
slub.c	slub: search partial list on numa_mem_id(), instead of numa_node_id()	2014-06-06 16:08:06 -07:00
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_state.c	mm: page_alloc: convert hot/cold parameter and immediate callers to bool	2014-06-04 16:54:09 -07:00
swap.c	mm: non-atomically mark page accessed during page cache allocation where possible	2014-06-04 16:54:10 -07:00
swapfile.c	mm/swapfile.c: delete the "last_in_cluster < scan_base" loop in the body of scan_swap_map()	2014-06-04 16:54:12 -07:00
truncate.c	mm: filemap: update find_get_pages_tag() to deal with shadow entries	2014-05-06 13:04:59 -07:00
util.c	nick kvfree() from apparmor	2014-05-06 14:02:53 -04:00
vmacache.c	mm,vmacache: optimize overflow system-wide flushing	2014-06-04 16:53:57 -07:00
vmalloc.c	mm/vmalloc.c: export unmap_kernel_range()	2014-06-04 16:54:14 -07:00
vmpressure.c	arm, pm, vmpressure: add missing slab.h includes	2014-02-03 13:24:01 -05:00
vmscan.c	vmscan: memcg: always use swappiness of the reclaimed memcg	2014-06-06 16:08:17 -07:00
vmstat.c	mm: use the light version __mod_zone_page_state in mlocked_vma_newpage()	2014-06-04 16:54:07 -07:00
workingset.c	mm: keep page cache radix tree nodes in check	2014-04-03 16:21:01 -07:00
zbud.c	mm/zbud.c: make size unsigned like unique callsite	2014-06-04 16:54:13 -07:00
zsmalloc.c	zsmalloc: fixup trivial zs size classes value in comments	2014-06-04 16:54:13 -07:00
zswap.c	mm/zswap: NUMA aware allocation for zswap_dstmem	2014-06-04 16:54:14 -07:00