Wangyang Guo 8162147872 nptl: Add backoff mechanism to spinlock loop ... When mutiple threads waiting for lock at the same time, once lock owner releases the lock, waiters will see lock available and all try to lock, which may cause an expensive CAS storm. Binary exponential backoff with random jitter is introduced. As try-lock attempt increases, there is more likely that a larger number threads compete for adaptive mutex lock, so increase wait time in exponential. A random jitter is also added to avoid synchronous try-lock from other threads. v2: Remove read-check before try-lock for performance. v3: 1. Restore read-check since it works well in some platform. 2. Make backoff arch dependent, and enable it for x86_64. 3. Limit max backoff to reduce latency in large critical section. v4: Fix strict-prototypes error in sysdeps/nptl/pthread_mutex_backoff.h v5: Commit log updated for regression in large critical section. Result of pthread-mutex-locks bench Test Platform: Xeon 8280L (2 socket, 112 CPUs in total) First Row: thread number First Col: critical section length Values: backoff vs upstream, time based, low is better non-critical-length: 1 1 2 4 8 16 32 64 112 140 0 0.99 0.58 0.52 0.49 0.43 0.44 0.46 0.52 0.54 1 0.98 0.43 0.56 0.50 0.44 0.45 0.50 0.56 0.57 2 0.99 0.41 0.57 0.51 0.45 0.47 0.48 0.60 0.61 4 0.99 0.45 0.59 0.53 0.48 0.49 0.52 0.64 0.65 8 1.00 0.66 0.71 0.63 0.56 0.59 0.66 0.72 0.71 16 0.97 0.78 0.91 0.73 0.67 0.70 0.79 0.80 0.80 32 0.95 1.17 0.98 0.87 0.82 0.86 0.89 0.90 0.90 64 0.96 0.95 1.01 1.01 0.98 1.00 1.03 0.99 0.99 128 0.99 1.01 1.01 1.17 1.08 1.12 1.02 0.97 1.02 non-critical-length: 32 1 2 4 8 16 32 64 112 140 0 1.03 0.97 0.75 0.65 0.58 0.58 0.56 0.70 0.70 1 0.94 0.95 0.76 0.65 0.58 0.58 0.61 0.71 0.72 2 0.97 0.96 0.77 0.66 0.58 0.59 0.62 0.74 0.74 4 0.99 0.96 0.78 0.66 0.60 0.61 0.66 0.76 0.77 8 0.99 0.99 0.84 0.70 0.64 0.66 0.71 0.80 0.80 16 0.98 0.97 0.95 0.76 0.70 0.73 0.81 0.85 0.84 32 1.04 1.12 1.04 0.89 0.82 0.86 0.93 0.91 0.91 64 0.99 1.15 1.07 1.00 0.99 1.01 1.05 0.99 0.99 128 1.00 1.21 1.20 1.22 1.25 1.31 1.12 1.10 0.99 non-critical-length: 128 1 2 4 8 16 32 64 112 140 0 1.02 1.00 0.99 0.67 0.61 0.61 0.61 0.74 0.73 1 0.95 0.99 1.00 0.68 0.61 0.60 0.60 0.74 0.74 2 1.00 1.04 1.00 0.68 0.59 0.61 0.65 0.76 0.76 4 1.00 0.96 0.98 0.70 0.63 0.63 0.67 0.78 0.77 8 1.01 1.02 0.89 0.73 0.65 0.67 0.71 0.81 0.80 16 0.99 0.96 0.96 0.79 0.71 0.73 0.80 0.84 0.84 32 0.99 0.95 1.05 0.89 0.84 0.85 0.94 0.92 0.91 64 1.00 0.99 1.16 1.04 1.00 1.02 1.06 0.99 0.99 128 1.00 1.06 0.98 1.14 1.39 1.26 1.08 1.02 0.98 There is regression in large critical section. But adaptive mutex is aimed for "quick" locks. Small critical section is more common when users choose to use adaptive pthread_mutex. Signed-off-by: Wangyang Guo <wangyang.guo@intel.com> Reviewed-by: H.J. Lu <hjl.tools@gmail.com>		2022-05-09 14:38:40 -07:00
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alloca_cutoff.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
allocatestack.c	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
cancellation.c	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
cleanup_compat.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
cleanup_defer_compat.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
cleanup_defer.c	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
cleanup_routine.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
cleanup.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
cond-perf.c	Use glibc_likely instead __builtin_expect.	2014-02-10 15:07:12 +01:00
default-sched.h	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
descr.h	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
DESIGN-systemtap-probes.txt	nptl: Add POSIX-proposed pthread_mutex_clocklock	2019-07-12 13:36:25 +00:00
elision-conf.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
elision-conf.h
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errno-loc.c
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nptl_lock_constants.pysym	New pthread rwlock that is more scalable.	2017-01-10 11:50:17 +01:00
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pthread_cancel.c	nptl: Fix pthread_cancel cancelhandling atomic operations	2022-04-20 12:01:43 -03:00
pthread_cleanup_upto.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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pthread_join_common.c	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
pthread_join.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread_key_create.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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pthread_kill.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread_mutex_cond_lock.c	nptl: Move core mutex functions into libc	2021-04-21 19:49:51 +02:00
pthread_mutex_conf.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread_mutex_consistent.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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pthread_mutex_init.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread_mutex_lock.c	nptl: Add backoff mechanism to spinlock loop	2022-05-09 14:38:40 -07:00
pthread_mutex_setprioceiling.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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pthread_self.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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pthread_setcancelstate.c	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
pthread_setcanceltype.c	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
pthread_setconcurrency.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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pthread_setschedprio.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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pthread_spin_unlock.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread_testcancel.c	nptl: Handle spurious EINTR when thread cancellation is disabled (BZ#29029)	2022-04-14 12:48:31 -03:00
pthread_timedjoin.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread_tryjoin.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread_yield.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
pthread-pi-defines.sym	Get rid of nptl/sysdeps/ entirely!	2014-07-07 09:28:38 -07:00
sem_clockwait.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
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semaphoreP.h	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
shlib-versions	Remove configuration name patterns from shlib-versions.	2014-09-12 12:28:47 +00:00
test-cond-printers.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-cond-printers.py	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-condattr-printers.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-condattr-printers.py	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-mutex-printers.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-mutex-printers.py	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-mutexattr-printers.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-mutexattr-printers.py	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-rwlock-printers.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-rwlock-printers.py	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-rwlockattr-printers.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
test-rwlockattr-printers.py	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
thrd_current.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
thrd_yield.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
TODO
TODO-kernel
TODO-testing
tpp.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-attr2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-attr3.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-audit-threads-mod1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-audit-threads-mod2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-audit-threads.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-audit-threads.h	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-barrier5.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cancel4_1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cancel4_2-time64.c	y2038: Add test coverage	2021-06-15 10:42:11 -03:00
tst-cancel4_2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cancel7.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cancel17.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cancel24-static.cc
tst-cancel24.cc
tst-cancelx7.c
tst-cancelx17.c
tst-cleanup4.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cleanup4aux.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cleanupx4.c
tst-cleanupx4aux.c	Compile tst-cleanupx4 test with -fexceptions	2016-06-29 20:24:44 -07:00
tst-clock2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-compat-forwarder-mod.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-compat-forwarder.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-cond22.c	nptl: Extract <bits/atomic_wide_counter.h> from pthread_cond_common.c	2021-11-17 12:20:13 +01:00
tst-cond26.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-context1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-default-attr.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-dlsym1.c	Remove "Contributed by" lines	2021-09-03 22:06:44 +05:30
tst-eintr1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-exec4.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-exec5.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-execstack-mod.c
tst-execstack.c
tst-initializers1-c11.c	Add -std=gnu11 and -std=c11 NPTL initializers tests.	2015-10-27 21:48:34 +00:00
tst-initializers1-c89.c
tst-initializers1-c99.c
tst-initializers1-gnu11.c	Add -std=gnu11 and -std=c11 NPTL initializers tests.	2015-10-27 21:48:34 +00:00
tst-initializers1-gnu89.c
tst-initializers1-gnu99.c
tst-initializers1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-minstack-cancel.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-minstack-exit.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-minstack-throw.cc	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-mutex5a.c
tst-mutex7a.c
tst-mutex8-static.c
tst-mutex8.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-mutexpi1.c	Fix -Waddress warnings in nptl/tst-mutex1.c.	2014-12-02 22:33:57 +00:00
tst-mutexpi2.c
tst-mutexpi3.c
tst-mutexpi4.c
tst-mutexpi5.c
tst-mutexpi5a.c
tst-mutexpi6.c
tst-mutexpi7.c
tst-mutexpi7a.c
tst-mutexpi8-static.c
tst-mutexpi8.c
tst-mutexpi9.c
tst-mutexpi10.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-mutexpp1.c	Fix -Waddress warnings in nptl/tst-mutex1.c.	2014-12-02 22:33:57 +00:00
tst-mutexpp5.c	nptl: Fix PTHREAD_PRIO_PROTECT timed lock	2020-11-27 09:59:13 -03:00
tst-mutexpp6.c	Get rid of warning comparision will always evaluate as true	2014-12-12 11:14:00 +01:00
tst-mutexpp9.c	nptl: Fix PTHREAD_PRIO_PROTECT timed lock	2020-11-27 09:59:13 -03:00
tst-mutexpp10.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-oddstacklimit.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-once5.cc	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread_exit-nothreads-static.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread_exit-nothreads.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread-attr-affinity-fail.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread-attr-affinity.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread-attr-sigmask.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread-defaultattr-free.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread-gdb-attach-static.c	nptl_db: Support different libpthread/ld.so load orders (bug 27744)	2021-04-21 11:50:43 +02:00
tst-pthread-gdb-attach.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-pthread-getattr.c	Allow for unpriviledged nested containers	2022-04-04 14:17:08 -04:00
tst-pthread-timedlock-lockloop.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-robust-fork.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-robustpi1.c
tst-robustpi2.c
tst-robustpi3.c
tst-robustpi4.c
tst-robustpi5.c
tst-robustpi6.c
tst-robustpi7.c
tst-robustpi8.c
tst-robustpi9.c
tst-rwlock2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock2a.c
tst-rwlock2b.c	New pthread rwlock that is more scalable.	2017-01-10 11:50:17 +01:00
tst-rwlock3.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock6.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock7.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock8.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock9.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock10.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock11.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock15.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock17.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock18.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock19.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock20.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-rwlock-pwn.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-sched1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-sem11-static.c
tst-sem11.c	Fix semaphore destruction (bug 12674).	2015-01-21 00:46:16 -05:00
tst-sem12-static.c
tst-sem12.c
tst-sem13.c	nptl: Add POSIX-proposed sem_clockwait	2019-07-12 13:36:23 +00:00
tst-sem17.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-setgetname.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-setgroups.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-setuid1-static.c
tst-setuid1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-setuid2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-signal3.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-signal7.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-stack2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-stack3.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-stack4.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-stack4mod.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-stackguard1-static.c
tst-stackguard1.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-thread_local1.cc	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-thread-affinity-pthread2.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-thread-affinity-pthread.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-thread-affinity-sched.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-thread-exit-clobber.cc	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-thread-setspecific.c	nptl: Use libc-diag.h with tst-thread-setspecific	2022-03-31 09:02:41 -03:00
tst-tls3-malloc.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-tls3.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-tls3mod.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-tls5.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-tls5.h	Add missing header files throughout the testsuite.	2017-02-16 17:33:18 -05:00
tst-tls5mod.c
tst-tls5moda.c
tst-tls5modb.c
tst-tls5modc.c
tst-tls5modd.c
tst-tls5mode.c
tst-tls5modf.c
tst-tls6.sh	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-tpp.h	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-tsd3.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
tst-tsd4.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
unwind.c	nptl: Fix cleanups for stack grows up [BZ# 28899]	2022-02-28 15:47:38 +00:00
unwindbuf.sym	Get rid of nptl/sysdeps/ entirely!	2014-07-07 09:28:38 -07:00
vars.c	Update copyright dates with scripts/update-copyrights	2022-01-01 11:40:24 -08:00
Versions	nptl: Use out-of-line wake function in __libc_lock_unlock slow path	2021-07-09 10:59:22 +02:00