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Message-Id: <20080428192859.23649.24538.sendpatchset@skynet.skynet.ie>
Date: Mon, 28 Apr 2008 20:28:59 +0100 (IST)
From: Mel Gorman <mel@....ul.ie>
To: akpm@...ux-foundation.org
Cc: Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
linux-mm@...ck.org, apw@...dowen.org, mingo@...e.hu,
clameter@....com
Subject: [PATCH 1/4] Add a basic debugging framework for memory initialisation
This patch adds additional debugging and verification code for memory
initialisation. Once enabled, the verification checks are always run and
when required additional debugging information may be outputted via a
mminit_loglevel= command-line parameter. The verification code is placed
in a new file mm/mm_init.c. Ideally other mm initialisation code will be
moved here over time.
Signed-off-by: Mel Gorman <mel@....ul.ie>
---
Documentation/kernel-parameters.txt | 8 ++++++++
lib/Kconfig.debug | 12 ++++++++++++
mm/Makefile | 1 +
mm/internal.h | 27 +++++++++++++++++++++++++++
mm/mm_init.c | 18 ++++++++++++++++++
mm/page_alloc.c | 16 ++++++++++------
6 files changed, 76 insertions(+), 6 deletions(-)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.25-mm1-clean/Documentation/kernel-parameters.txt linux-2.6.25-mm1-0010_mminit_debug_framework/Documentation/kernel-parameters.txt
--- linux-2.6.25-mm1-clean/Documentation/kernel-parameters.txt 2008-04-22 10:29:56.000000000 +0100
+++ linux-2.6.25-mm1-0010_mminit_debug_framework/Documentation/kernel-parameters.txt 2008-04-28 14:39:59.000000000 +0100
@@ -1185,6 +1185,14 @@ and is between 256 and 4096 characters.
mga= [HW,DRM]
+ mminit_loglevel=
+ [KNL] When CONFIG_DEBUG_MEMORY_INIT is set, this
+ parameter allows control of the logging verbosity for
+ the additional memory initialisation checks. A value
+ of 0 disables mminit logging and a level of 4 will
+ log everything. Information is printed at KERN_DEBUG
+ so loglevel=8 may also need to be specified.
+
mousedev.tap_time=
[MOUSE] Maximum time between finger touching and
leaving touchpad surface for touch to be considered
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.25-mm1-clean/lib/Kconfig.debug linux-2.6.25-mm1-0010_mminit_debug_framework/lib/Kconfig.debug
--- linux-2.6.25-mm1-clean/lib/Kconfig.debug 2008-04-22 10:30:04.000000000 +0100
+++ linux-2.6.25-mm1-0010_mminit_debug_framework/lib/Kconfig.debug 2008-04-28 14:39:59.000000000 +0100
@@ -482,6 +482,18 @@ config DEBUG_WRITECOUNT
If unsure, say N.
+config DEBUG_MEMORY_INIT
+ bool "Debug memory initialisation" if EMBEDDED
+ default !EMBEDDED
+ help
+ Enable this for additional checks during memory initialisation.
+ The sanity checks verify aspects of the VM such as the memory model
+ and other information provided by the architecture. Verbose
+ information will be printed at KERN_DEBUG loglevel depending
+ on the mminit_loglevel= command-line option.
+
+ If unsure, say Y
+
config DEBUG_LIST
bool "Debug linked list manipulation"
depends on DEBUG_KERNEL
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.25-mm1-clean/mm/internal.h linux-2.6.25-mm1-0010_mminit_debug_framework/mm/internal.h
--- linux-2.6.25-mm1-clean/mm/internal.h 2008-04-22 10:30:04.000000000 +0100
+++ linux-2.6.25-mm1-0010_mminit_debug_framework/mm/internal.h 2008-04-28 14:39:59.000000000 +0100
@@ -59,4 +59,31 @@ static inline unsigned long page_order(s
#define __paginginit __init
#endif
+/* Memory initialisation debug and verification */
+enum mminit_level {
+ MMINIT_WARNING,
+ MMINIT_VERIFY,
+ MMINIT_TRACE
+};
+
+#ifdef CONFIG_DEBUG_MEMORY_INIT
+
+extern int mminit_loglevel;
+
+#define mminit_dprintk(level, prefix, fmt, arg...) \
+do { \
+ if (level < mminit_loglevel) { \
+ printk(level <= MMINIT_WARNING ? KERN_WARNING : KERN_DEBUG \
+ "mminit:: " prefix " " fmt, ##arg); \
+ } \
+} while (0)
+
+#else
+
+static inline void mminit_dprintk(enum mminit_level level,
+ const char *prefix, const char *fmt, ...)
+{
+}
+
+#endif /* CONFIG_DEBUG_MEMORY_INIT */
#endif
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.25-mm1-clean/mm/Makefile linux-2.6.25-mm1-0010_mminit_debug_framework/mm/Makefile
--- linux-2.6.25-mm1-clean/mm/Makefile 2008-04-22 10:30:04.000000000 +0100
+++ linux-2.6.25-mm1-0010_mminit_debug_framework/mm/Makefile 2008-04-28 14:39:59.000000000 +0100
@@ -33,4 +33,5 @@ obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_SMP) += allocpercpu.o
obj-$(CONFIG_QUICKLIST) += quicklist.o
obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o
+obj-$(CONFIG_DEBUG_MEMORY_INIT) += mm_init.o
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.25-mm1-clean/mm/mm_init.c linux-2.6.25-mm1-0010_mminit_debug_framework/mm/mm_init.c
--- linux-2.6.25-mm1-clean/mm/mm_init.c 2008-04-22 12:29:06.000000000 +0100
+++ linux-2.6.25-mm1-0010_mminit_debug_framework/mm/mm_init.c 2008-04-28 14:39:59.000000000 +0100
@@ -0,0 +1,18 @@
+/*
+ * mm_init.c - Memory initialisation verification and debugging
+ *
+ * Copyright 2008 IBM Corporation, 2008
+ * Author Mel Gorman <mel@....ul.ie>
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+int __meminitdata mminit_loglevel;
+
+static __init int set_mminit_loglevel(char *str)
+{
+ get_option(&str, &mminit_loglevel);
+ return 0;
+}
+early_param("mminit_loglevel", set_mminit_loglevel);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.25-mm1-clean/mm/page_alloc.c linux-2.6.25-mm1-0010_mminit_debug_framework/mm/page_alloc.c
--- linux-2.6.25-mm1-clean/mm/page_alloc.c 2008-04-22 10:30:04.000000000 +0100
+++ linux-2.6.25-mm1-0010_mminit_debug_framework/mm/page_alloc.c 2008-04-28 14:39:59.000000000 +0100
@@ -3068,7 +3068,8 @@ void __init sparse_memory_present_with_a
void __init push_node_boundaries(unsigned int nid,
unsigned long start_pfn, unsigned long end_pfn)
{
- printk(KERN_DEBUG "Entering push_node_boundaries(%u, %lu, %lu)\n",
+ mminit_dprintk(MMINIT_TRACE, "zoneboundary",
+ "Entering push_node_boundaries(%u, %lu, %lu)\n",
nid, start_pfn, end_pfn);
/* Initialise the boundary for this node if necessary */
@@ -3086,7 +3087,8 @@ void __init push_node_boundaries(unsigne
static void __meminit account_node_boundary(unsigned int nid,
unsigned long *start_pfn, unsigned long *end_pfn)
{
- printk(KERN_DEBUG "Entering account_node_boundary(%u, %lu, %lu)\n",
+ mminit_dprintk(MMINIT_TRACE, "zoneboundary",
+ "Entering account_node_boundary(%u, %lu, %lu)\n",
nid, *start_pfn, *end_pfn);
/* Return if boundary information has not been provided */
@@ -3460,8 +3462,8 @@ static void __paginginit free_area_init_
memmap_pages = (size * sizeof(struct page)) >> PAGE_SHIFT;
if (realsize >= memmap_pages) {
realsize -= memmap_pages;
- printk(KERN_DEBUG
- " %s zone: %lu pages used for memmap\n",
+ mminit_dprintk(MMINIT_TRACE, "memmap_init",
+ "%s zone: %lu pages used for memmap\n",
zone_names[j], memmap_pages);
} else
printk(KERN_WARNING
@@ -3471,7 +3473,8 @@ static void __paginginit free_area_init_
/* Account for reserved pages */
if (j == 0 && realsize > dma_reserve) {
realsize -= dma_reserve;
- printk(KERN_DEBUG " %s zone: %lu pages reserved\n",
+ mminit_dprintk(MMINIT_TRACE, "memmap_init",
+ "%s zone: %lu pages reserved\n",
zone_names[0], dma_reserve);
}
@@ -3609,7 +3612,8 @@ void __init add_active_range(unsigned in
{
int i;
- printk(KERN_DEBUG "Entering add_active_range(%d, %lu, %lu) "
+ mminit_dprintk(MMINIT_TRACE, "memory_register",
+ "Entering add_active_range(%d, %lu, %lu) "
"%d entries of %d used\n",
nid, start_pfn, end_pfn,
nr_nodemap_entries, MAX_ACTIVE_REGIONS);
--
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