Hugh Dickins 1aac140031 tmpfs: quit when fallocate fills memory ... As it stands, a large fallocate() on tmpfs is liable to fill memory with pages, freed on failure except when they run into swap, at which point they become fixed into the file despite the failure. That feels quite wrong, to be consuming resources precisely when they're in short supply. Go the other way instead: shmem_fallocate() indicate the range it has fallocated to shmem_writepage(), keeping count of pages it's allocating; shmem_writepage() reactivate instead of swapping out pages fallocated by this syscall (but happily swap out those from earlier occasions), keeping count; shmem_fallocate() compare counts and give up once the reactivated pages have started to coming back to writepage (approximately: some zones would in fact recycle faster than others). This is a little unusual, but works well: although we could consider the failure to swap as a bug, and fix it later with SWAP_MAP_FALLOC handling added in swapfile.c and memcontrol.c, I doubt that we shall ever want to. (If there's no swap, an over-large fallocate() on tmpfs is limited in the same way as writing: stopped by rlimit, or by tmpfs mount size if that was set sensibly, or by __vm_enough_memory() heuristics if OVERCOMMIT_GUESS or OVERCOMMIT_NEVER. If OVERCOMMIT_ALWAYS, then it is liable to OOM-kill others as writing would, but stops and frees if interrupted.) Now that everything is freed on failure, we can then skip updating ctime. Signed-off-by: Hugh Dickins <hughd@google.com> Cc: Christoph Hellwig <hch@infradead.org> Cc: Cong Wang <amwang@redhat.com> Cc: Kay Sievers <kay@vrfy.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-05-29 16:22:23 -07:00
..
backing-dev.c	backing-dev: fix wakeup timer races with bdi_unregister()	2012-02-01 16:52:49 +08:00
bootmem.c	mm: remove sparsemem allocation details from the bootmem allocator	2012-05-29 16:22:22 -07:00
bounce.c	mm: remove the second argument of k[un]map_atomic()	2012-03-20 21:48:27 +08:00
cleancache.c	mm: cleancache: Use __read_mostly as appropiate.	2012-01-23 16:08:09 -05:00
compaction.c	mm: compaction: handle incorrect MIGRATE_UNMOVABLE type pageblocks	2012-05-29 16:22:22 -07:00
debug-pagealloc.c	mm, x86: Remove debug_pagealloc_enabled	2011-12-06 09:24:07 +01:00
dmapool.c	mm: fix implicit stat.h usage in dmapool.c	2011-10-31 09:20:12 -04:00
fadvise.c	fadvise: only initiate writeback for specified range with FADV_DONTNEED	2012-01-10 16:30:43 -08:00
failslab.c	switch debugfs to umode_t	2012-01-03 22:54:56 -05:00
filemap_xip.c	mm/filemap_xip.c: fix race condition in xip_file_fault()	2012-02-03 16:16:41 -08:00
filemap.c	radix-tree: use iterators in find_get_pages* functions	2012-03-28 17:14:37 -07:00
fremap.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
highmem.c	Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux	2011-11-06 19:44:47 -08:00
huge_memory.c	mm, thp: drop page_table_lock to uncharge memcg pages	2012-05-29 16:22:20 -07:00
hugetlb.c	mm/hugetlb.c: use long vars instead of int in region_count()	2012-05-29 16:22:18 -07:00
hwpoison-inject.c	HWPOISON: Clean up memory_failure() vs. __memory_failure()	2012-01-03 12:06:32 -08:00
init-mm.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
internal.h	mm: compaction: handle incorrect MIGRATE_UNMOVABLE type pageblocks	2012-05-29 16:22:22 -07:00
Kconfig	Cross Memory Attach: make it Kconfigurable	2012-05-29 16:22:20 -07:00
Kconfig.debug	mm: more intensive memory corruption debugging	2012-01-10 16:30:42 -08:00
kmemcheck.c	kmemcheck: Fix build errors due to missing slab.h	2010-03-30 22:02:32 +09:00
kmemleak-test.c	kmemleak: remove memset by using kzalloc	2011-01-27 18:31:51 +00:00
kmemleak.c	kmemleak: Disable early logging when kmemleak is off by default	2012-01-20 16:57:05 +00:00
ksm.c	ksm: cleanup: introduce find_mergeable_vma()	2012-03-21 17:54:59 -07:00
maccess.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
madvise.c	mm/fs: route MADV_REMOVE to FALLOC_FL_PUNCH_HOLE	2012-05-29 16:22:22 -07:00
Makefile	Cross Memory Attach: make it Kconfigurable	2012-05-29 16:22:20 -07:00
memblock.c	memblock: memblock should be able to handle zero length operations	2012-04-20 11:18:46 -07:00
memcontrol.c	shmem: replace page if mapping excludes its zone	2012-05-29 16:22:22 -07:00
memory_hotplug.c	mm: print physical addresses consistently with other parts of kernel	2012-05-29 16:22:21 -07:00
memory-failure.c	mm/memory_failure: let the compiler add the function name	2012-05-29 16:22:18 -07:00
memory.c	thp, memcg: split hugepage for memcg oom on cow	2012-05-29 16:22:19 -07:00
mempolicy.c	mm: do_migrate_pages(): rename arguments	2012-05-29 16:22:20 -07:00
mempool.c	mempool: fix first round failure behavior	2012-01-10 16:30:45 -08:00
migrate.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace	2012-05-23 17:42:39 -07:00
mincore.c	mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode	2012-03-21 17:54:54 -07:00
mlock.c	vm: avoid using find_vma_prev() unnecessarily	2012-03-06 18:23:36 -08:00
mm_init.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmap.c	mm/mmap.c: find_vma(): remove unnecessary if(mm) check	2012-05-29 16:22:19 -07:00
mmu_context.c	mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat()	2012-03-21 17:54:59 -07:00
mmu_notifier.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
mmzone.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
mprotect.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-03-22 09:04:48 -07:00
mremap.c	mm: collapse security_vm_enough_memory() variants into a single function	2012-02-14 10:45:39 +11:00
msync.c	sanitize vfs_fsync calling conventions	2010-05-21 18:31:21 -04:00
nobootmem.c	mm: remove sparsemem allocation details from the bootmem allocator	2012-05-29 16:22:22 -07:00
nommu.c	kill mm argument of vm_munmap()	2012-04-21 01:58:20 -04:00
oom_kill.c	userns: Store uid and gid values in struct cred with kuid_t and kgid_t types	2012-05-03 03:28:38 -07:00
page_alloc.c	mm: compaction: handle incorrect MIGRATE_UNMOVABLE type pageblocks	2012-05-29 16:22:22 -07:00
page_cgroup.c	page_cgroup: fix horrid swap accounting regression	2012-03-06 08:18:23 -08:00
page_io.c	block: kill off REQ_UNPLUG	2011-03-10 08:52:27 +01:00
page_isolation.c	mm: page_isolation: MIGRATE_CMA isolation functions added	2012-05-21 15:09:33 +02:00
page-writeback.c	writeback: initialize global_dirty_limit	2012-05-06 13:41:58 +08:00
pagewalk.c	mm: thp: fix pmd_bad() triggering in code paths holding mmap_sem read mode	2012-03-21 17:54:54 -07:00
percpu-km.c	percpu: clear memory allocated with the km allocator	2010-10-02 10:28:42 +03:00
percpu-vm.c	percpu: use bitmap_clear	2012-01-20 09:23:16 -08:00
percpu.c	kmemleak: Fix the kmemleak tracking of the percpu areas with !SMP	2012-05-09 10:13:29 -07:00
pgtable-generic.c	arch/tile: allow building Linux with transparent huge pages enabled	2012-05-25 12:48:21 -04:00
prio_tree.c	sanitize <linux/prefetch.h> usage	2011-05-20 12:50:29 -07:00
process_vm_access.c	Fix race in process_vm_rw_core	2012-02-02 12:55:17 -08:00
quicklist.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
readahead.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
rmap.c	mm: remove swap token code	2012-05-29 16:22:19 -07:00
shmem.c	tmpfs: quit when fallocate fills memory	2012-05-29 16:22:23 -07:00
slab.c	Merge branch 'slab/for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/linux	2012-03-28 15:04:26 -07:00
slob.c	mm: Map most files to use export.h instead of module.h	2011-10-31 09:20:12 -04:00
slub.c	slub: missing test for partial pages flush work in flush_all()	2012-05-17 18:00:51 -07:00
sparse-vmemmap.c	mm: delete various needless include <linux/module.h>	2011-10-31 09:20:11 -04:00
sparse.c	mm: remove sparsemem allocation details from the bootmem allocator	2012-05-29 16:22:22 -07:00
swap_state.c	mm: fix s390 BUG by __set_page_dirty_no_writeback on swap	2012-04-23 18:19:22 -07:00
swap.c	mm: drain percpu lru add/rotate page-vectors on cpu hot-unplug	2012-03-21 17:54:58 -07:00
swapfile.c	shmem: replace page if mapping excludes its zone	2012-05-29 16:22:22 -07:00
truncate.c	mm/fs: remove truncate_range	2012-05-29 16:22:23 -07:00
util.c	procfs: mark thread stack correctly in proc/<pid>/maps	2012-03-21 17:54:58 -07:00
vmalloc.c	mm: use kcalloc() instead of kzalloc() to allocate array	2012-05-29 16:22:19 -07:00
vmscan.c	mm: rename is_mlocked_vma() to mlocked_vma_newpage()	2012-05-29 16:22:20 -07:00
vmstat.c	mm/vmstat.c: remove debug fs entries on failure of file creation and made extfrag_debug_root dentry local	2012-05-29 16:22:19 -07:00