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authorLinus Torvalds <torvalds@linux-foundation.org>2019-05-06 23:50:15 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2019-05-06 23:50:15 +0300
commit007dc78fea62610bf06829e38f1d8c69b6ea5af6 (patch)
tree683af90696ed7a237dedd48030bfd649e5822955 /arch/Kconfig
parent2f1835dffa949f560dfa3ed63c0bfc10944b461c (diff)
parentd671002be6bdd7f77a771e23bf3e95d1f16775e6 (diff)
downloadlinux-007dc78fea62610bf06829e38f1d8c69b6ea5af6.tar.xz
Merge branch 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull locking updates from Ingo Molnar: "Here are the locking changes in this cycle: - rwsem unification and simpler micro-optimizations to prepare for more intrusive (and more lucrative) scalability improvements in v5.3 (Waiman Long) - Lockdep irq state tracking flag usage cleanups (Frederic Weisbecker) - static key improvements (Jakub Kicinski, Peter Zijlstra) - misc updates, cleanups and smaller fixes" * 'locking-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (26 commits) locking/lockdep: Remove unnecessary unlikely() locking/static_key: Don't take sleeping locks in __static_key_slow_dec_deferred() locking/static_key: Factor out the fast path of static_key_slow_dec() locking/static_key: Add support for deferred static branches locking/lockdep: Test all incompatible scenarios at once in check_irq_usage() locking/lockdep: Avoid bogus Clang warning locking/lockdep: Generate LOCKF_ bit composites locking/lockdep: Use expanded masks on find_usage_*() functions locking/lockdep: Map remaining magic numbers to lock usage mask names locking/lockdep: Move valid_state() inside CONFIG_TRACE_IRQFLAGS && CONFIG_PROVE_LOCKING locking/rwsem: Prevent unneeded warning during locking selftest locking/rwsem: Optimize rwsem structure for uncontended lock acquisition locking/rwsem: Enable lock event counting locking/lock_events: Don't show pvqspinlock events on bare metal locking/lock_events: Make lock_events available for all archs & other locks locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs locking/rwsem: Enhance DEBUG_RWSEMS_WARN_ON() macro locking/rwsem: Add debug check for __down_read*() locking/rwsem: Micro-optimize rwsem_try_read_lock_unqueued() locking/rwsem: Move rwsem internal function declarations to rwsem-xadd.h ...
Diffstat (limited to 'arch/Kconfig')
-rw-r--r--arch/Kconfig9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index a826843470ed..3ab446bd12ef 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -907,6 +907,15 @@ config HAVE_ARCH_PREL32_RELOCATIONS
config ARCH_USE_MEMREMAP_PROT
bool
+config LOCK_EVENT_COUNTS
+ bool "Locking event counts collection"
+ depends on DEBUG_FS
+ ---help---
+ Enable light-weight counting of various locking related events
+ in the system with minimal performance impact. This reduces
+ the chance of application behavior change because of timing
+ differences. The counts are reported via debugfs.
+
source "kernel/gcov/Kconfig"
source "scripts/gcc-plugins/Kconfig"