This patch add some comment related to performance impact,
which can be really big (x3 times slower context switch).
Signed-off-by: Lukasz Luba <l.l...@partner.samsung.com>
---
lib/Kconfig.debug | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4966c4f..9e67a2a3 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1088,6 +1088,9 @@ config PROVE_LOCKING
the proof of observed correctness is also maintained for an
arbitrary combination of these separate locking variants.
+ This feature enables LOCKDEP which can harm system performance
+ even x3 times.
+
For more details, see Documentation/locking/lockdep-design.txt.
config LOCK_STAT
@@ -1112,6 +1115,10 @@ config LOCK_STAT
CONFIG_LOCK_STAT defines "contended" and "acquired" lock events.
(CONFIG_LOCKDEP defines "acquire" and "release" events.)
+ This feature enables LOCKDEP which can harm system performance
+ even x3 times.
+ For more details, see Documentation/locking/lockdep-design.txt.
+
config DEBUG_RT_MUTEXES
bool "RT Mutex debugging, deadlock detection"
depends on DEBUG_KERNEL && RT_MUTEXES
@@ -1175,6 +1182,10 @@ config DEBUG_LOCK_ALLOC
spin_lock_init()/mutex_init()/etc., or whether there is any lock
held during task exit.
+ This feature enables LOCKDEP which can harm system performance
+ even x3 times.
+ For more details, see Documentation/locking/lockdep-design.txt.
+
config LOCKDEP
bool
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
--
2.7.4
