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| author | Waiman Long <longman@redhat.com> | 2018-10-18 21:45:18 -0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2018-10-19 07:53:18 +0200 |
| commit | 01a14bda11add9dcd4a59200f13834d634559935 (patch) | |
| tree | c7fc12f5c710502f98bdb917d3eaf9da0943b000 /include/linux/debug_locks.h | |
| parent | 9506a7425b094d2f1d9c877ed5a78f416669269b (diff) | |
| download | lwn-01a14bda11add9dcd4a59200f13834d634559935.tar.gz lwn-01a14bda11add9dcd4a59200f13834d634559935.zip | |
locking/lockdep: Make global debug_locks* variables read-mostly
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 <longman@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1539913518-15598-2-git-send-email-longman@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'include/linux/debug_locks.h')
| -rw-r--r-- | include/linux/debug_locks.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/include/linux/debug_locks.h b/include/linux/debug_locks.h index 120225e9a366..257ab3c92cb8 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) |