Ming Lei e6fc464987 blk-mq: avoid starving tag allocation after allocating process migrates ... When the allocation process is scheduled back and the mapped hw queue is changed, fake one extra wake up on previous queue for compensating wake up miss, so other allocations on the previous queue won't be starved. This patch fixes one request allocation hang issue, which can be triggered easily in case of very low nr_request. The race is as follows: 1) 2 hw queues, nr_requests are 2, and wake_batch is one 2) there are 3 waiters on hw queue 0 3) two in-flight requests in hw queue 0 are completed, and only two waiters of 3 are waken up because of wake_batch, but both the two waiters can be scheduled to another CPU and cause to switch to hw queue 1 4) then the 3rd waiter will wait for ever, since no in-flight request is in hw queue 0 any more. 5) this patch fixes it by the fake wakeup when waiter is scheduled to another hw queue Cc: <stable@vger.kernel.org> Reviewed-by: Omar Sandoval <osandov@fb.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Modified commit message to make it clearer, and make it apply on top of the 4.18 branch. Signed-off-by: Jens Axboe <axboe@kernel.dk>		2018-05-24 11:00:39 -06:00
..
842
fonts
lz4
lzo
mpi
raid6	powerpc updates for 4.17	2018-04-07 12:08:19 -07:00
reed_solomon
xz
zlib_deflate
zlib_inflate
zstd	lib: zstd: clean up Makefile for simpler composite object handling	2018-03-26 02:01:27 +09:00
.gitignore
argv_split.c
ashldi3.c
ashrdi3.c
asn1_decoder.c
assoc_array.c
atomic64.c
atomic64_test.c
audit.c
bcd.c
bch.c
bitmap.c	lib: fix stall in __bitmap_parselist()	2018-04-05 21:36:21 -07:00
bitrev.c
bsearch.c
btree.c	btree: avoid variable-length allocations	2018-03-14 16:55:29 -07:00
bucket_locks.c
bug.c	lib/bug.c: exclude non-BUG/WARN exceptions from report_bug()	2018-03-09 16:40:01 -08:00
build_OID_registry
bust_spinlocks.c
chacha20.c
check_signature.c
checksum.c
clz_ctz.c
clz_tab.c
cmdline.c
cmpdi2.c
compat_audit.c
cordic.c
cpu_rmap.c
cpumask.c	lib: optimize cpumask_next_and()	2018-02-06 18:32:44 -08:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
crc4.c
crc7.c
crc8.c
crc16.c
crc32.c
crc32defs.h
crc32test.c
ctype.c
debug_info.c
debug_locks.c
debugobjects.c	debugobjects: Avoid another unused variable warning	2018-03-14 20:20:01 +01:00
dec_and_lock.c
decompress.c
decompress_bunzip2.c
decompress_inflate.c
decompress_unlz4.c
decompress_unlzma.c
decompress_unlzo.c
decompress_unxz.c
devres.c	devres: combine function devm_ioremap*	2018-03-15 18:08:55 +01:00
digsig.c
div64.c
dma-debug.c	dma-debug: fix memory leak in debug_dma_alloc_coherent	2018-02-22 15:02:33 -08:00
dma-direct.c	dma-direct: don't retry allocation for no-op GFP_DMA	2018-04-23 14:43:27 +02:00
dma-virt.c
dump_stack.c	printk: move dump stack related code to lib/dump_stack.c	2018-03-15 13:25:36 +01:00
dynamic_debug.c
dynamic_queue_limits.c
earlycpio.c
error-inject.c
errseq.c	errseq: Always report a writeback error once	2018-04-27 08:51:26 -04:00
extable.c
fault-inject.c
fdt.c
fdt_empty_tree.c
fdt_ro.c
fdt_rw.c
fdt_strerror.c
fdt_sw.c
fdt_wip.c
find_bit.c	lib: optimize cpumask_next_and()	2018-02-06 18:32:44 -08:00
find_bit_benchmark.c	lib: optimize cpumask_next_and()	2018-02-06 18:32:44 -08:00
flex_array.c
flex_proportions.c
gcd.c
gen_crc32table.c
genalloc.c
glob.c
globtest.c
hexdump.c
hweight.c
idr.c	idr: Fix handling of IDs above INT_MAX	2018-02-26 14:39:30 -05:00
inflate.c
int_sqrt.c	lib: Add strongly typed 64bit int_sqrt	2018-02-04 10:17:21 +00:00
interval_tree.c
interval_tree_test.c
iomap.c
iomap_copy.c
iommu-common.c
iommu-helper.c
ioremap.c	mm/vmalloc: add interfaces to free unmapped page table	2018-03-22 17:07:01 -07:00
iov_iter.c
irq_poll.c
irq_regs.c
is_single_threaded.c
jedec_ddr_data.c
kasprintf.c
Kconfig	lib: Add generic PIO mapping method	2018-03-21 17:18:34 -05:00
Kconfig.debug	lib/Kconfig.debug: Debug Lockups and Hangs: keep SOFTLOCKUP options together	2018-04-11 10:28:35 -07:00
Kconfig.kasan	kasan: rework Kconfig settings	2018-02-06 18:32:47 -08:00
Kconfig.kgdb
Kconfig.ubsan	lib: add testing module for UBSAN	2018-04-11 10:28:35 -07:00
kfifo.c	kfifo: fix inaccurate comment	2018-03-27 11:15:42 +02:00
klist.c
kobject.c	kobject: don't use WARN for registration failures	2018-04-23 13:14:55 +02:00
kobject_uevent.c	net: Drop pernet_operations::async	2018-03-27 13:18:09 -04:00
kstrtox.c
kstrtox.h
lcm.c
libcrc32c.c	libcrc32c: Add crc32c_impl function	2018-03-26 15:09:38 +02:00
list_debug.c	lib/list_debug.c: print unmangled addresses	2018-04-11 10:28:35 -07:00
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-rtmutex.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	lockref: Add lockref_put_not_zero	2018-04-12 09:41:19 -07:00
logic_pio.c	lib: Add generic PIO mapping method	2018-03-21 17:18:34 -05:00
lru_cache.c
lshrdi3.c
Makefile	lib: add testing module for UBSAN	2018-04-11 10:28:35 -07:00
memory-notifier-error-inject.c
memweight.c
muldi3.c
net_utils.c
netdev-notifier-error-inject.c
nlattr.c
nmi_backtrace.c
nodemask.c
notifier-error-inject.c
notifier-error-inject.h
of-reconfig-notifier-error-inject.c
oid_registry.c
once.c
parman.c
parser.c
pci_iomap.c	PCI: Add SPDX GPL-2.0 when no license was specified	2018-01-26 11:45:16 -06:00
percpu-refcount.c	percpu_ref: Update doc to dissuade users from depending on internal RCU grace periods	2018-03-19 10:09:44 -07:00
percpu_counter.c
percpu_ida.c
percpu_test.c
plist.c
pm-notifier-error-inject.c
prime_numbers.c
radix-tree.c	radix tree: use GFP_ZONEMASK bits of gfp_t for flags	2018-04-11 10:28:39 -07:00
random32.c
ratelimit.c
rational.c
rbtree.c
rbtree_test.c
reciprocal_div.c
refcount.c
rhashtable.c	rhashtable: add schedule points	2018-03-31 23:25:39 -04:00
sbitmap.c	blk-mq: avoid starving tag allocation after allocating process migrates	2018-05-24 11:00:39 -06:00
scatterlist.c	lib/scatterlist: add sg_init_marker() helper	2018-03-30 22:50:15 +02:00
seq_buf.c
sg_pool.c
sg_split.c
sha1.c
sha256.c	kernel/kexec_file.c: move purgatories sha256 to common code	2018-04-13 17:10:28 -07:00
show_mem.c
siphash.c
smp_processor_id.c
sort.c
stackdepot.c	lib/stackdepot.c: use a non-instrumented version of memcmp()	2018-02-06 18:32:44 -08:00
stmp_device.c
string.c	lib/strscpy: Shut up KASAN false-positives in strscpy()	2018-02-01 12:20:21 -08:00
string_helpers.c
strncpy_from_user.c
strnlen_user.c
swiotlb.c	swiotlb: fix inversed DMA_ATTR_NO_WARN test	2018-05-02 14:48:55 +02:00
syscall.c
test-kstrtox.c
test-string_helpers.c
test_bitmap.c	lib/test_bitmap.c: do not accidentally use stack VLA	2018-04-11 10:28:35 -07:00
test_bpf.c	test_bpf: Fix NULL vs IS_ERR() check in test_skb_segment()	2018-03-29 14:33:29 -04:00
test_debug_virtual.c
test_firmware.c	headers: untangle kmemleak.h from mm.h	2018-04-05 21:36:27 -07:00
test_hash.c
test_hexdump.c
test_kasan.c	kasan: fix invalid-free test crashing the kernel	2018-04-11 10:28:32 -07:00
test_kmod.c	lib/test_kmod.c: fix limit check on number of test devices created	2018-03-09 16:40:02 -08:00
test_list_sort.c
test_module.c
test_parman.c
test_printf.c
test_rhashtable.c	test_rhashtable: add test case for rhltable with duplicate objects	2018-03-07 10:44:03 -05:00
test_siphash.c
test_sort.c	lib/test_sort.c: add module unload support	2018-02-06 18:32:45 -08:00
test_static_key_base.c
test_static_keys.c
test_string.c
test_sysctl.c
test_ubsan.c	lib/test_ubsan.c: make test_ubsan_misaligned_access() static	2018-04-11 10:28:35 -07:00
test_user_copy.c	treewide: simplify Kconfig dependencies for removed archs	2018-03-26 15:55:57 +02:00
test_uuid.c
textsearch.c	textsearch: fix kernel-doc warnings and add kernel-api section	2018-04-16 18:53:13 -04:00
timerqueue.c
ts_bm.c
ts_fsm.c
ts_kmp.c
ubsan.c	lib/ubsan: remove returns-nonnull-attribute checks	2018-02-06 18:32:46 -08:00
ubsan.h	lib/ubsan: remove returns-nonnull-attribute checks	2018-02-06 18:32:46 -08:00
ucmpdi2.c
ucs2_string.c
usercopy.c
uuid.c
vsprintf.c	proc: add seq_put_decimal_ull_width to speed up /proc/pid/smaps	2018-04-11 10:28:33 -07:00
win_minmax.c
xxhash.c