Make the frequently used lockdep global variable debug_locks read-mostly. As debug_locks_silent is sometime used together with debug_locks, it is also made read-mostly so that they can be close together.
With false cacheline sharing, cacheline contention problem can happen depending on what get put into the same cacheline as debug_locks. Signed-off-by: Waiman Long <long...@redhat.com> --- include/linux/debug_locks.h | 4 ++-- lib/debug_locks.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-) diff --git a/include/linux/debug_locks.h b/include/linux/debug_locks.h index 120225e..257ab3c 100644 --- a/include/linux/debug_locks.h +++ b/include/linux/debug_locks.h @@ -8,8 +8,8 @@ struct task_struct; -extern int debug_locks; -extern int debug_locks_silent; +extern int debug_locks __read_mostly; +extern int debug_locks_silent __read_mostly; static inline int __debug_locks_off(void) diff --git a/lib/debug_locks.c b/lib/debug_locks.c index 124fdf2..ce51749 100644 --- a/lib/debug_locks.c +++ b/lib/debug_locks.c @@ -21,7 +21,7 @@ * that would just muddy the log. So we report the first one and * shut up after that. */ -int debug_locks = 1; +int debug_locks __read_mostly = 1; EXPORT_SYMBOL_GPL(debug_locks); /* @@ -29,7 +29,7 @@ * 'silent failure': nothing is printed to the console when * a locking bug is detected. */ -int debug_locks_silent; +int debug_locks_silent __read_mostly; EXPORT_SYMBOL_GPL(debug_locks_silent); /* -- 1.8.3.1
