linux-kernel - [PATCH v2 2/2] lockdep: Keep the static allocations small for PROVE_LOCKING

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Date:   Mon, 26 Sep 2016 15:31:38 -0700
From:   Babu Moger <babu.moger@...cle.com>
To:     peterz@...radead.org, mingo@...hat.com, akpm@...ux-foundation.org,
        keescook@...omium.org, dan.j.williams@...el.com,
        aryabinin@...tuozzo.com, tj@...nel.org
Cc:     linux-kernel@...r.kernel.org, sparclinux@...r.kernel.org,
        babu.moger@...cle.com
Subject: [PATCH v2 2/2] lockdep: Keep the static allocations small for PROVE_LOCKING_SMALL

Reduce the size of data structure for lockdep entries half if
PROVE_LOCKING_SMALL if defined. This is used for sparc. This
config variable is disabled by default.

Signed-off-by: Babu Moger <babu.moger@...cle.com>
---
 kernel/locking/lockdep_internals.h |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
index 51c4b24..7d364a6 100644
--- a/kernel/locking/lockdep_internals.h
+++ b/kernel/locking/lockdep_internals.h
@@ -54,18 +54,25 @@ enum {
  * table (if it's not there yet), and we check it for lock order
  * conflicts and deadlocks.
  */
+#ifdef CONFIG_PROVE_LOCKING_SMALL
+#define MAX_LOCKDEP_ENTRIES	16384UL
+#define MAX_LOCKDEP_CHAINS_BITS	15
+#define MAX_STACK_TRACE_ENTRIES	262144UL
+#else
 #define MAX_LOCKDEP_ENTRIES	32768UL
 
 #define MAX_LOCKDEP_CHAINS_BITS	16
-#define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)
-
-#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
 
 /*
  * Stack-trace: tightly packed array of stack backtrace
  * addresses. Protected by the hash_lock.
  */
 #define MAX_STACK_TRACE_ENTRIES	524288UL
+#endif
+
+#define MAX_LOCKDEP_CHAINS	(1UL << MAX_LOCKDEP_CHAINS_BITS)
+
+#define MAX_LOCKDEP_CHAIN_HLOCKS (MAX_LOCKDEP_CHAINS*5)
 
 extern struct list_head all_lock_classes;
 extern struct lock_chain lock_chains[];
-- 
1.7.1