linux-kernel - [PATCH 1/1] debugobjects: Allow bigger number of objects

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Message-Id: <1453461761-14761-1-git-send-email-borntraeger@de.ibm.com>
Date:	Fri, 22 Jan 2016 12:22:41 +0100
From:	Christian Borntraeger <borntraeger@...ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Christian Borntraeger <borntraeger@...ibm.com>
Subject: [PATCH 1/1] debugobjects: Allow bigger number of objects

On my bigger s390 systems  I always get
"Out of memory. ODEBUG disabled". Since the number of objects
is needed at compile time in the code, let's provide a Kconfig
variable to increase the number of static objects.

Signed-off-by: Christian Borntraeger <borntraeger@...ibm.com>
---
 lib/Kconfig.debug  | 11 +++++++++++
 lib/debugobjects.c |  2 +-
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 8c15b29..dc44b6f 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -453,6 +453,17 @@ config DEBUG_OBJECTS_ENABLE_DEFAULT
         help
           Debug objects boot parameter default value
 
+config DEBUG_OBJECTS_STATIC_ELEMENTS
+	int "debug_objects static element buffer size (100-10000)"
+	range 100 10000
+	default "500"
+	depends on DEBUG_OBJECTS
+	help
+	  How many static objects can be stored at early boot time. If this
+	  value is exceeded object debugging will stop with an message
+	  "Out of memory. ODEBUG disabled". Higher values will allocate a
+	  bigger static buffer, but this buffer will be released later on.
+
 config DEBUG_SLAB
 	bool "Debug slab memory allocations"
 	depends on DEBUG_KERNEL && SLAB && !KMEMCHECK
diff --git a/lib/debugobjects.c b/lib/debugobjects.c
index 547f7f9..fc4ae86 100644
--- a/lib/debugobjects.c
+++ b/lib/debugobjects.c
@@ -21,7 +21,7 @@
 #define ODEBUG_HASH_BITS	14
 #define ODEBUG_HASH_SIZE	(1 << ODEBUG_HASH_BITS)
 
-#define ODEBUG_POOL_SIZE	512
+#define ODEBUG_POOL_SIZE	CONFIG_DEBUG_OBJECTS_STATIC_ELEMENTS
 #define ODEBUG_POOL_MIN_LEVEL	256
 
 #define ODEBUG_CHUNK_SHIFT	PAGE_SHIFT
-- 
2.3.0