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locking/lock_events: Make lock_events available for all archs & other locks

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The QUEUED_LOCK_STAT option to report queued spinlocks event counts
was previously allowed only on x86 architecture. To make the locking
event counting code more useful, it is now renamed to a more generic
LOCK_EVENT_COUNTS config option. This new option will be available to
all the architectures that use qspinlock at the moment.

Other locking code can now start to use the generic locking event
counting code by including lock_events.h and put the new locking event
names into the lock_events_list.h header file.

My experience with lock event counting is that it gives valuable insight
on how the locking code works and what can be done to make it better. I
would like to extend this benefit to other locking code like mutex and
rwsem in the near future.

The PV qspinlock specific code will stay in qspinlock_stat.h. The
locking event counters will now reside in the <debugfs>/lock_event_counts
directory.

Signed-off-by: Waiman Long <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Acked-by: Davidlohr Bueso <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Tim Chen <[email protected]>
Cc: Will Deacon <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Waiman Long 2019-04-04 13:43:17 -04:00 • committed by Ingo Molnar
commit fb346fd9fc
6 changed files with 183 additions and 140 deletions
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10
arch/Kconfig
View file

@ -901,6 +901,16 @@ config HAVE_ARCH_PREL32_RELOCATIONS
config ARCH_USE_MEMREMAP_PROT
bool
config LOCK_EVENT_COUNTS
bool "Locking event counts collection"
depends on DEBUG_FS
depends on QUEUED_SPINLOCKS
---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"