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authorWaiman Long <longman@redhat.com>2018-10-18 21:45:18 -0400
committerIngo Molnar <mingo@kernel.org>2018-10-19 07:53:18 +0200
commit01a14bda11add9dcd4a59200f13834d634559935 (patch)
treec7fc12f5c710502f98bdb917d3eaf9da0943b000 /lib
parent9506a7425b094d2f1d9c877ed5a78f416669269b (diff)
downloadlinux-01a14bda11add9dcd4a59200f13834d634559935.tar.gz
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 'lib')
-rw-r--r--lib/debug_locks.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/debug_locks.c b/lib/debug_locks.c
index 124fdf238b3d..ce51749cc145 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 @@ EXPORT_SYMBOL_GPL(debug_locks);
* '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);
/*