Herbert Xu 07ee0722bf rhashtable: Add cap on number of elements in hash table ... We currently have no limit on the number of elements in a hash table. This is a problem because some users (tipc) set a ceiling on the maximum table size and when that is reached the hash table may degenerate. Others may encounter OOM when growing and if we allow insertions when that happens the hash table perofrmance may also suffer. This patch adds a new paramater insecure_max_entries which becomes the cap on the table. If unset it defaults to max_size * 2. If it is also zero it means that there is no cap on the number of elements in the table. However, the table will grow whenever the utilisation hits 100% and if that growth fails, you will get ENOMEM on insertion. As allowing oversubscription is potentially dangerous, the name contains the word insecure. Note that the cap is not a hard limit. This is done for performance reasons as enforcing a hard limit will result in use of atomic ops that are heavier than the ones we currently use. The reasoning is that we're only guarding against a gross over- subscription of the table, rather than a small breach of the limit. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>		2015-05-16 18:08:26 -04:00
..
fonts
lz4	lib/lz4: Pull out constant tables	2015-03-25 15:04:57 +01:00
lzo
mpi
raid6	md/raid6 algorithms: xor_syndrome() for SSE2	2015-04-22 08:00:42 +10:00
reed_solomon
xz
zlib_deflate
zlib_inflate
.gitignore
argv_split.c
asn1_decoder.c
assoc_array.c
atomic64_test.c
atomic64.c
audit.c
average.c
bcd.c
bch.c
bitmap.c	lib/bitmap.c: bitmap_[empty,full]: remove code duplication	2015-04-17 09:03:56 -04:00
bitrev.c
bsearch.c
btree.c
bug.c
build_OID_registry
bust_spinlocks.c
check_signature.c
checksum.c
clz_ctz.c
clz_tab.c
cmdline.c
compat_audit.c
cordic.c
cpu_rmap.c
cpu-notifier-error-inject.c
cpumask.c	This is the final removal (after several years!) of the obsolete cpus_*	2015-04-20 10:19:03 -07:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
crc7.c
crc8.c
crc16.c
crc32.c
crc32defs.h
ctype.c
debug_locks.c
debugobjects.c
dec_and_lock.c
decompress_bunzip2.c
decompress_inflate.c
decompress_unlz4.c
decompress_unlzma.c
decompress_unlzo.c
decompress_unxz.c
decompress.c
devres.c	lib: devres: add a helper function for ioremap_wc	2015-03-16 21:11:32 +01:00
digsig.c
div64.c	lib: correct link to the original source for div64_u64	2015-03-06 23:19:27 +01:00
dma-debug.c	lib/dma-debug: fix bucket_find_contain()	2015-04-17 09:03:54 -04:00
dump_stack.c
dynamic_debug.c
dynamic_queue_limits.c
earlycpio.c
extable.c
fault-inject.c
fdt_empty_tree.c
fdt_ro.c
fdt_rw.c
fdt_strerror.c
fdt_sw.c
fdt_wip.c
fdt.c
find_bit.c	lib: rename lib/find_next_bit.c to lib/find_bit.c	2015-04-17 09:03:54 -04:00
flex_array.c
flex_proportions.c
gcd.c
gen_crc32table.c	lib: crc32: constify crc32 lookup table	2015-02-13 21:21:35 -08:00
genalloc.c	lib/genalloc.c: check result of devres_alloc()	2015-02-13 21:21:36 -08:00
glob.c
halfmd4.c
hexdump.c
hweight.c
idr.c
inflate.c
int_sqrt.c
interval_tree_test.c
interval_tree.c
iomap_copy.c
iomap.c
iommu-common.c	iommu-common: rename iommu_pool_hash to iommu_hash_common	2015-04-20 14:09:55 -04:00
iommu-helper.c
ioremap.c	x86, mm: support huge KVA mappings on x86	2015-04-14 16:49:04 -07:00
iov_iter.c	Merge branch 'iov_iter' into for-next	2015-04-11 22:26:51 -04:00
irq_regs.c
is_single_threaded.c
jedec_ddr_data.c
kasprintf.c
Kconfig	This is the final removal (after several years!) of the obsolete cpus_*	2015-04-20 10:19:03 -07:00
Kconfig.debug	Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-05-06 10:26:37 -07:00
Kconfig.kasan	kasan: show gcc version requirements in Kconfig and Documentation	2015-05-05 17:10:10 -07:00
Kconfig.kgdb
Kconfig.kmemcheck
kfifo.c
klist.c
kobject_uevent.c
kobject.c	kobject: WARN as tip when call kobject_get() to a kobject not initialized	2015-03-25 15:26:49 +01:00
kstrtox.c
kstrtox.h
lcm.c	block: fix blk_stack_limits() regression due to lcm() change	2015-03-31 09:45:50 -06:00
libcrc32c.c
list_debug.c
list_sort.c
llist.c
locking-selftest-hardirq.h
locking-selftest-mutex.h
locking-selftest-rlock-hardirq.h
locking-selftest-rlock-softirq.h
locking-selftest-rlock.h
locking-selftest-rsem.h
locking-selftest-softirq.h
locking-selftest-spin-hardirq.h
locking-selftest-spin-softirq.h
locking-selftest-spin.h
locking-selftest-wlock-hardirq.h
locking-selftest-wlock-softirq.h
locking-selftest-wlock.h
locking-selftest-wsem.h
locking-selftest.c
lockref.c	locking: Remove ACCESS_ONCE() usage	2015-02-24 08:44:16 +01:00
lru_cache.c	lru_cache: remove use of seq_printf return value	2015-04-15 16:35:25 -07:00
Makefile	Break up monolithic iommu table/lock into finer graularity pools and lock	2015-04-18 12:32:59 -07:00
md5.c
memory-notifier-error-inject.c
memweight.c
net_utils.c
nlattr.c	netlink: pad nla_memcpy dest buffer with zeroes	2015-03-31 14:07:24 -04:00
notifier-error-inject.c
notifier-error-inject.h
of-reconfig-notifier-error-inject.c
oid_registry.c
parser.c
pci_iomap.c
percpu_counter.c
percpu_ida.c
percpu_test.c
percpu-refcount.c
plist.c
pm-notifier-error-inject.c
proportions.c
radix-tree.c
random32.c
ratelimit.c
rational.c
rbtree_test.c
rbtree.c
reciprocal_div.c
rhashtable.c	rhashtable: Add cap on number of elements in hash table	2015-05-16 18:08:26 -04:00
scatterlist.c
seq_buf.c	seq_buf: Fix seq_buf_bprintf() truncation	2015-03-04 23:40:19 -05:00
sha1.c	lib: EXPORT_SYMBOL sha_init	2015-03-23 22:12:08 -04:00
show_mem.c
smp_processor_id.c
sort.c
stmp_device.c
string_helpers.c	SCSI misc on 20150416	2015-04-16 19:02:04 -04:00
string.c	lib: make memzero_explicit more robust against dead store elimination	2015-05-04 17:49:51 +08:00
strncpy_from_user.c
strnlen_user.c
swiotlb.c
syscall.c
test_bpf.c
test_firmware.c
test_kasan.c	lib: add kasan test module	2015-02-13 21:21:41 -08:00
test_module.c
test_rhashtable.c	test_rhashtable: Remove bogus max_size setting	2015-04-03 15:09:36 -04:00
test_user_copy.c
test-hexdump.c	hexdump: avoid warning in test function	2015-04-19 13:48:40 -07:00
test-kstrtox.c
test-string_helpers.c	lib/string_helpers.c: change semantics of string_escape_mem	2015-04-15 16:35:24 -07:00
textsearch.c
timerqueue.c
ts_bm.c
ts_fsm.c
ts_kmp.c
ucs2_string.c
usercopy.c
uuid.c
vsprintf.c	lib/vsprintf.c: improve put_dec_trunc8 slightly	2015-04-17 09:03:55 -04:00