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Jan Glauber 893a7d32e8 lockref: Limit number of cmpxchg loop retries 
The lockref cmpxchg loop is unbound as long as the spinlock is not
taken. Depending on the hardware implementation of compare-and-swap
a high number of loop retries might happen.

Add an upper bound to the loop to force the fallback to spinlocks
after some time. A retry value of 100 should not impact any hardware
that does not have this issue.

With the retry limit the performance of an open-close testcase
improved between 60-70% on ThunderX2.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Jan Glauber <jglauber@marvell.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-06-07 13:15:06 -07:00
..
842
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157
2019-05-30 11:26:37 -07:00
fonts
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
livepatch
livepatch: Proper error handling in the shadow variables selftest
2019-02-06 11:01:57 +01:00
lz4
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
lzo
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
math
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
mpi
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 26
2019-05-24 17:27:10 +02:00
raid6
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 83
2019-05-24 17:37:52 +02:00
reed_solomon
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
xz
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
zlib_deflate
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
zlib_inflate
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
zstd
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
.gitignore
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argv_split.c
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ashldi3.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 120
2019-05-24 17:39:02 +02:00
ashrdi3.c
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2019-05-24 17:39:02 +02:00
asn1_decoder.c
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2019-05-24 17:27:11 +02:00
assoc_array.c
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2019-05-24 17:27:11 +02:00
atomic64_test.c
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2019-05-30 11:26:32 -07:00
atomic64.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
audit.c
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bcd.c
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bch.c
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bitmap.c
lib: rework bitmap_parselist
2019-05-14 19:52:49 -07:00
bitrev.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
bsearch.c
kprobes: Prohibit probing on bsearch()
2019-02-13 08:16:41 +01:00
btree.c
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bucket_locks.c
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bug.c
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build_OID_registry
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
bust_spinlocks.c
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chacha.c
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2019-05-30 11:26:32 -07:00
check_signature.c
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checksum.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
clz_ctz.c
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clz_tab.c
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cmdline.c
lib/cmdline.c: mark expected switch fall-throughs
2019-04-08 18:39:23 -05:00
cmpdi2.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 120
2019-05-24 17:39:02 +02:00
compat_audit.c
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cpu_rmap.c
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cpumask.c
treewide: add checks for the return value of memblock_alloc*()
2019-03-12 10:04:02 -07:00
crc4.c
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crc7.c
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crc8.c
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crc16.c
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crc32.c
lib/crc32.c: mark crc32_le_base/__crc32c_le_base aliases as __pure
2019-02-15 19:50:07 +01:00
crc32defs.h
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crc32test.c
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crc64.c
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crc-ccitt.c
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crc-itu-t.c
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crc-t10dif.c
crypto: shash - remove shash_desc::flags
2019-04-25 15:38:12 +08:00
ctype.c
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debug_info.c
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debug_locks.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
debugobjects.c
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dec_and_lock.c
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decompress_bunzip2.c
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decompress_inflate.c
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decompress_unlz4.c
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decompress_unlzma.c
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decompress_unlzo.c
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2019-05-24 17:37:53 +02:00
decompress_unxz.c
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decompress.c
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devres.c
devres: always use dev_name() in devm_ioremap_resource()
2019-01-31 19:28:40 +01:00
digsig.c
crypto: shash - remove shash_desc::flags
2019-04-25 15:38:12 +08:00
dump_stack.c
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dynamic_debug.c
RDMA/core: Introduce RDMA subsystem ibdev_* print functions
2019-05-01 12:29:28 -04:00
dynamic_queue_limits.c
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earlycpio.c
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error-inject.c
treewide: Switch printk users from %pf and %pF to %ps and %pS, respectively
2019-04-09 14:19:06 +02:00
errseq.c
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extable.c
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2019-05-30 11:26:32 -07:00
fault-inject.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
fdt_empty_tree.c
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fdt_ro.c
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fdt_rw.c
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fdt_strerror.c
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fdt_sw.c
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fdt_wip.c
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fdt.c
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find_bit_benchmark.c
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find_bit.c
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2019-05-30 11:26:32 -07:00
flex_proportions.c
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gen_crc32table.c
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gen_crc64table.c
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genalloc.c
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generic-radix-tree.c
generic radix trees
2019-03-12 10:04:02 -07:00
glob.c
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globtest.c
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hexdump.c
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hweight.c
x86/kconfig: Disable CONFIG_GENERIC_HWEIGHT and remove __HAVE_ARCH_SW_HWEIGHT
2019-05-13 11:07:33 +02:00
idr.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
inflate.c
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interval_tree_test.c
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2019-05-21 10:50:45 +02:00
interval_tree.c
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2019-05-21 10:50:45 +02:00
iomap_copy.c
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iomap.c
iomap: introduce io{read|write}64_{lo_hi|hi_lo}
2019-01-22 13:39:59 +01:00
iommu-helper.c
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ioremap.c
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iov_iter.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
irq_poll.c
lib/irq_poll: Support schedules in non-interrupt contexts
2019-02-19 20:52:19 -07:00
irq_regs.c
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2019-05-30 11:26:32 -07:00
is_single_threaded.c
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2019-05-24 17:27:11 +02:00
jedec_ddr_data.c
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kasprintf.c
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Kconfig
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
Kconfig.debug
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2019-05-21 10:50:46 +02:00
Kconfig.kasan
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
Kconfig.kgdb
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
Kconfig.ubsan
treewide: Add SPDX license identifier - Makefile/Kconfig
2019-05-21 10:50:46 +02:00
kfifo.c
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2019-05-24 17:36:45 +02:00
klist.c
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kobject_uevent.c
kobject: Don't trigger kobject_uevent(KOBJ_REMOVE) twice.
2019-04-01 07:37:12 +02:00
kobject.c
kobject: clean up the kobject add documentation a bit more
2019-05-03 08:26:51 +02:00
kstrtox.c
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kstrtox.h
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libcrc32c.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
list_debug.c
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list_sort.c
lib/list_sort: fix kerneldoc build error
2019-05-23 09:27:39 -06:00
llist.c
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locking-selftest-hardirq.h
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locking-selftest-mutex.h
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locking-selftest-rlock-hardirq.h
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locking-selftest-rlock-softirq.h
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locking-selftest-rlock.h
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locking-selftest-rsem.h
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locking-selftest-rtmutex.h
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locking-selftest-softirq.h
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locking-selftest-spin-hardirq.h
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locking-selftest-spin-softirq.h
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locking-selftest-spin.h
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locking-selftest-wlock-hardirq.h
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locking-selftest-wlock-softirq.h
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locking-selftest-wlock.h
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locking-selftest-wsem.h
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locking-selftest.c
locking/lockdep: Make it easy to detect whether or not inside a selftest
2019-02-28 07:55:43 +01:00
lockref.c
lockref: Limit number of cmpxchg loop retries
2019-06-07 13:15:06 -07:00
logic_pio.c
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lru_cache.c
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2019-05-24 17:37:53 +02:00
lshrdi3.c
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2019-05-24 17:39:02 +02:00
Makefile
lib: Move mathematic helpers to separate folder
2019-05-14 19:52:49 -07:00
memcat_p.c
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memory-notifier-error-inject.c
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2019-05-21 10:50:45 +02:00
memweight.c
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muldi3.c
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2019-05-24 17:39:02 +02:00
net_utils.c
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netdev-notifier-error-inject.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
nlattr.c
netlink: add validation of NLA_F_NESTED flag
2019-05-04 01:27:11 -04:00
nmi_backtrace.c
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nodemask.c
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notifier-error-inject.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
notifier-error-inject.h
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objagg.c
lib: objagg: fix handling of object with 0 users when assembling hints
2019-02-14 12:41:54 -05:00
of-reconfig-notifier-error-inject.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
oid_registry.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 36
2019-05-24 17:27:11 +02:00
once.c
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packing.c
lib: Add support for generic packing operations
2019-05-03 10:49:17 -04:00
parman.c
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parser.c
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pci_iomap.c
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percpu_counter.c
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percpu_test.c
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2019-05-21 10:50:45 +02:00
percpu-refcount.c
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2019-05-21 10:50:45 +02:00
plist.c
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2019-05-21 11:28:45 +02:00
pm-notifier-error-inject.c
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2019-05-21 10:50:45 +02:00
radix-tree.c
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2019-05-30 11:26:32 -07:00
random32.c
lib: Correct comment of prandom_seed
2019-05-17 11:32:47 -07:00
ratelimit.c
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rbtree_test.c
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2019-05-21 10:50:45 +02:00
rbtree.c
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2019-05-30 11:26:35 -07:00
refcount.c
refcount_t: Add ACQUIRE ordering on success for dec(sub)_and_test() variants
2019-02-04 09:03:31 +01:00
rhashtable.c
rhashtable: Fix cmpxchg RCU warnings
2019-05-16 09:45:20 -07:00
sbitmap.c
sbitmap: fix improper use of smp_mb__before_atomic()
2019-05-23 10:25:26 -06:00
scatterlist.c
lib/scatterlist: Provide a DMA page iterator
2019-02-11 15:02:33 -07:00
seq_buf.c
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sg_pool.c
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2019-05-21 10:50:45 +02:00
sg_split.c
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sha1.c
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sha256.c
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2019-05-30 11:26:32 -07:00
show_mem.c
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siphash.c
lib/siphash.c: mark expected switch fall-throughs
2019-04-25 19:47:24 +02:00
smp_processor_id.c
kprobes: Prohibit probing on preemption checking debug functions
2019-02-13 08:16:40 +01:00
sort.c
lib/sort.c: fix kernel-doc notation warnings
2019-06-01 15:51:31 -07:00
stackdepot.c
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2019-05-30 11:26:41 -07:00
stmp_device.c
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2019-05-30 11:26:32 -07:00
string_helpers.c
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2019-05-21 10:50:45 +02:00
string.c
lib/string: Add strscpy_pad() function
2019-04-08 16:44:21 -06:00
strncpy_from_user.c
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
2019-04-24 12:19:45 +02:00
strnlen_user.c
mm/uaccess: Use 'unsigned long' to placate UBSAN warnings on older GCC versions
2019-04-24 12:19:45 +02:00
syscall.c
syscalls: Remove start and number from syscall_get_arguments() args
2019-04-05 09:26:43 -04:00
test_bitfield.c
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test_bitmap.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
test_bpf.c
bpf: test_bpf: turn off preemption in function __run_once
2019-02-25 22:18:07 +01:00
test_debug_virtual.c
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2019-05-21 10:50:45 +02:00
test_firmware.c
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2019-05-21 10:50:45 +02:00
test_hash.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
test_hexdump.c
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test_ida.c
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test_kasan.c
kasan: remove use after scope bugs detection.
2019-03-05 21:07:13 -08:00
test_kmod.c
lib/test_kmod.c: potential double free in error handling
2019-02-01 15:46:23 -08:00
test_list_sort.c
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2019-05-21 10:50:45 +02:00
test_memcat_p.c
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test_module.c
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2019-05-21 10:50:45 +02:00
test_objagg.c
test_objagg: Uninitialized variable in error handling
2019-02-13 22:13:29 -08:00
test_overflow.c
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test_parman.c
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test_printf.c
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2019-05-21 10:50:45 +02:00
test_rhashtable.c
rhashtable: move dereference inside rht_ptr()
2019-04-12 17:34:45 -07:00
test_siphash.c
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test_sort.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
test_stackinit.c
treewide: fix typos of SPDX-License-Identifier
2019-06-01 18:29:58 +02:00
test_static_key_base.c
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test_static_keys.c
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test_string.c
treewide: Add SPDX license identifier for more missed files
2019-05-21 10:50:45 +02:00
test_strscpy.c
lib: Add test module for strscpy_pad
2019-04-08 16:44:21 -06:00
test_sysctl.c
tools/testing/selftests/sysctl/sysctl.sh: add proc_do_large_bitmap() test case
2019-05-14 19:52:51 -07:00
test_ubsan.c
lib/test_ubsan.c: VLA no longer used in kernel
2019-03-07 18:32:00 -08:00
test_user_copy.c
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test_uuid.c
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test_vmalloc.c
lib/test_vmalloc.c:test_func(): eliminate local `ret'
2019-05-14 19:52:49 -07:00
test_xarray.c
XArray: Fix xa_reserve for 2-byte aligned entries
2019-02-21 17:54:44 -05:00
test-kstrtox.c
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test-string_helpers.c
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textsearch.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
timerqueue.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
2019-05-30 11:26:35 -07:00
ts_bm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ts_fsm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ts_kmp.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ubsan.c
Merge branch 'core-objtool-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2019-05-06 11:39:17 -07:00
ubsan.h
ubsan: Remove vla bound checks.
2019-05-06 11:12:09 -07:00
ucmpdi2.c
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2019-05-24 17:39:02 +02:00
ucs2_string.c
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usercopy.c
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uuid.c
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2019-05-30 11:26:41 -07:00
vsprintf.c
treewide: Add SPDX license identifier for missed files
2019-05-21 10:50:45 +02:00
win_minmax.c
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xarray.c
XArray: Fix xa_reserve for 2-byte aligned entries
2019-02-21 17:54:44 -05:00
xxhash.c
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