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Date: Mon, 9 Mar 2009 15:40:37 -0700
From: Sage Weil <sage@...dream.net>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc: Sage Weil <sage@...dream.net>
Subject: [PATCH 18/20] ceph: debugging
Some debugging infrastructure, including the ability to adjust the
level of debug output on a per-file basis. A memory leak detection
tool can also be enabled via .config.
Signed-off-by: Sage Weil <sage@...dream.net>
---
fs/ceph/bookkeeper.c | 117 ++++++++++++++++++++++++++++++++++++++++++++++++++
fs/ceph/bookkeeper.h | 19 ++++++++
fs/ceph/ceph_debug.h | 103 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 239 insertions(+), 0 deletions(-)
create mode 100644 fs/ceph/bookkeeper.c
create mode 100644 fs/ceph/bookkeeper.h
create mode 100644 fs/ceph/ceph_debug.h
diff --git a/fs/ceph/bookkeeper.c b/fs/ceph/bookkeeper.c
new file mode 100644
index 0000000..5f05509
--- /dev/null
+++ b/fs/ceph/bookkeeper.c
@@ -0,0 +1,117 @@
+#include <linux/spinlock.h>
+#include <linux/slab.h>
+#include <linux/kallsyms.h>
+
+#define CEPH_OVERRIDE_BOOKKEEPER /* avoid kmalloc/kfree recursion */
+
+#define CEPH_BK_MAGIC 0x140985AC
+
+#include "ceph_debug.h"
+
+int ceph_debug_tools __read_mostly = -1;
+#define DOUT_VAR ceph_debug_tools
+#define DOUT_MASK DOUT_MASK_TOOLS
+#include "super.h"
+
+static struct list_head _bk_allocs;
+
+static DEFINE_SPINLOCK(_bk_lock);
+
+static size_t _total_alloc;
+static size_t _total_free;
+
+struct alloc_data {
+ u32 prefix_magic;
+ struct list_head node;
+ size_t size;
+ char *fname;
+ int line;
+ u32 suffix_magic;
+};
+
+void *ceph_kmalloc(char *fname, int line, size_t size, gfp_t flags)
+{
+ struct alloc_data *p = kmalloc(size+sizeof(struct alloc_data), flags);
+
+ if (!p)
+ return NULL;
+
+ p->prefix_magic = CEPH_BK_MAGIC;
+ p->size = size;
+ p->fname = fname;
+ p->line = line;
+ p->suffix_magic = CEPH_BK_MAGIC;
+
+ spin_lock(&_bk_lock);
+ _total_alloc += size;
+
+ list_add_tail(&p->node, &_bk_allocs);
+ spin_unlock(&_bk_lock);
+
+ return ((void *)p)+sizeof(struct alloc_data);
+}
+
+void ceph_kfree(void *ptr)
+{
+ struct alloc_data *p = (struct alloc_data *)(ptr -
+ sizeof(struct alloc_data));
+ int overrun = 0;
+
+ if (!ptr)
+ return;
+
+ if (p->prefix_magic != CEPH_BK_MAGIC) {
+ derr(0, "ERROR: memory overrun (under)!\n");
+ overrun = 1;
+ }
+
+ if (p->suffix_magic != CEPH_BK_MAGIC) {
+ derr(0, "ERROR: Memory overrun (over)!\n");
+ overrun = 1;
+ }
+
+ if (overrun) {
+ derr(0, "Memory allocated at %s(%d): p=%p (%zu bytes)\n", p->fname,
+ p->line,
+ ((void *)p)+sizeof(struct alloc_data),
+ p->size);
+ }
+
+ BUG_ON(overrun);
+
+ spin_lock(&_bk_lock);
+ _total_free += p->size;
+ list_del(&p->node);
+ spin_unlock(&_bk_lock);
+
+ kfree(p);
+
+ return;
+}
+
+void ceph_bookkeeper_init(void)
+{
+ dout(10, "bookkeeper: start\n");
+ INIT_LIST_HEAD(&_bk_allocs);
+}
+
+void ceph_bookkeeper_finalize(void)
+{
+ struct list_head *p;
+ struct alloc_data *entry;
+
+ dout(1, "bookkeeper: total bytes alloc: %zu\n", _total_alloc);
+ dout(1, "bookkeeper: total bytes free: %zu\n", _total_free);
+
+ if (_total_alloc != _total_free) {
+ list_for_each(p, &_bk_allocs) {
+ entry = list_entry(p, struct alloc_data, node);
+ dout(1, "%s(%d): p=%p (%zu bytes)\n", entry->fname,
+ entry->line,
+ ((void *)entry)+sizeof(struct alloc_data),
+ entry->size);
+ }
+ } else {
+ dout(1, "No leaks found! Yay!\n");
+ }
+}
diff --git a/fs/ceph/bookkeeper.h b/fs/ceph/bookkeeper.h
new file mode 100644
index 0000000..e7124f1
--- /dev/null
+++ b/fs/ceph/bookkeeper.h
@@ -0,0 +1,19 @@
+#ifndef _FS_CEPH_BOOKKEEPER_H
+#define _FS_CEPH_BOOKKEEPER_H
+
+#ifdef CONFIG_CEPH_BOOKKEEPER
+extern void ceph_bookkeeper_init(void);
+extern void ceph_bookkeeper_finalize(void);
+extern void *ceph_kmalloc(char *fname, int line, size_t size, gfp_t flags);
+extern void ceph_kfree(void *ptr);
+
+#ifndef CEPH_OVERRIDE_BOOKKEEPER
+#define kmalloc(size, flags) ceph_kmalloc(__FILE__, __LINE__, size, flags)
+#define kzalloc(size, flags) ceph_kmalloc(__FILE__, __LINE__, size, \
+ flags | __GFP_ZERO)
+#define kfree ceph_kfree
+#endif
+
+#endif
+
+#endif
diff --git a/fs/ceph/ceph_debug.h b/fs/ceph/ceph_debug.h
new file mode 100644
index 0000000..e06ec3d
--- /dev/null
+++ b/fs/ceph/ceph_debug.h
@@ -0,0 +1,103 @@
+#ifndef _FS_CEPH_DEBUG_H
+#define _FS_CEPH_DEBUG_H
+
+#include <linux/string.h>
+
+#include "bookkeeper.h"
+
+extern int ceph_debug __read_mostly; /* debug level. */
+extern int ceph_debug_console __read_mostly; /* send debug output to console? */
+extern int ceph_debug_mask __read_mostly;
+
+/*
+ * different debug levels for different modules. These default to -1.
+ * If they are >= 0, then they override the global ceph_debug value.
+ */
+extern int ceph_debug_addr __read_mostly;
+extern int ceph_debug_caps __read_mostly;
+extern int ceph_debug_dir __read_mostly;
+extern int ceph_debug_export __read_mostly;
+extern int ceph_debug_file __read_mostly;
+extern int ceph_debug_inode __read_mostly;
+extern int ceph_debug_ioctl __read_mostly;
+extern int ceph_debug_mdsc __read_mostly;
+extern int ceph_debug_mdsmap __read_mostly;
+extern int ceph_debug_msgr __read_mostly;
+extern int ceph_debug_mon __read_mostly;
+extern int ceph_debug_osdc __read_mostly;
+extern int ceph_debug_osdmap __read_mostly;
+extern int ceph_debug_snap __read_mostly;
+extern int ceph_debug_super __read_mostly;
+extern int ceph_debug_protocol __read_mostly;
+extern int ceph_debug_proc __read_mostly;
+extern int ceph_debug_tools __read_mostly;
+
+#define DOUT_MASK_ADDR 0x00000001
+#define DOUT_MASK_CAPS 0x00000002
+#define DOUT_MASK_DIR 0x00000004
+#define DOUT_MASK_EXPORT 0x00000008
+#define DOUT_MASK_FILE 0x00000010
+#define DOUT_MASK_INODE 0x00000020
+#define DOUT_MASK_IOCTL 0x00000040
+#define DOUT_MASK_MDSC 0x00000080
+#define DOUT_MASK_MDSMAP 0x00000100
+#define DOUT_MASK_MSGR 0x00000200
+#define DOUT_MASK_MON 0x00000400
+#define DOUT_MASK_OSDC 0x00000800
+#define DOUT_MASK_OSDMAP 0x00001000
+#define DOUT_MASK_SNAP 0x00002000
+#define DOUT_MASK_SUPER 0x00004000
+#define DOUT_MASK_PROTOCOL 0x00008000
+#define DOUT_MASK_PROC 0x00010000
+#define DOUT_MASK_TOOLS 0x00020000
+
+#define DOUT_UNMASKABLE 0x80000000
+
+#define _STRINGIFY(x) #x
+#define STRINGIFY(x) _STRINGIFY(x)
+
+#define FMT_PREFIX "%-30.30s: "
+#define FMT_SUFFIX "%s"
+#define LOG_ARGS __FILE__ ":" STRINGIFY(__LINE__)
+#define TRAIL_PARAM ""
+
+#define LOG_LINE FMT_PREFIX fmt, LOG_ARGS, args
+
+#define dout_flag(x, mask, fmt, args...) do { \
+ if (((ceph_debug_mask | DOUT_UNMASKABLE) & mask) && \
+ ((DOUT_VAR >= 0 && x <= DOUT_VAR) || \
+ (DOUT_VAR < 0 && x <= ceph_debug))) { \
+ if (ceph_debug_console) \
+ printk(KERN_ERR FMT_PREFIX fmt, LOG_ARGS, args); \
+ else \
+ printk(KERN_DEBUG FMT_PREFIX fmt, LOG_ARGS, args); \
+ } \
+ } while (0)
+
+#define _dout(x, fmt, args...) dout_flag(x, DOUT_MASK, fmt FMT_SUFFIX, args)
+
+#define _derr(x, fmt, args...) do { \
+ printk(KERN_ERR FMT_PREFIX fmt FMT_SUFFIX, LOG_ARGS, args); \
+ } while (0)
+
+#define dout(x, args...) _dout(x, args, TRAIL_PARAM)
+#define derr(x, args...) _derr(x, args, TRAIL_PARAM)
+
+/* dcache d_count debugging */
+#if 0
+# define dput(dentry) \
+ do { \
+ dout(20, "dput %p %d -> %d\n", dentry, \
+ atomic_read(&dentry->d_count), \
+ atomic_read(&dentry->d_count)-1); \
+ dput(dentry); \
+ } while (0)
+# define d_drop(dentry) \
+ do { \
+ dout(20, "d_drop %p\n", dentry); \
+ d_drop(dentry); \
+ } while (0)
+#endif
+
+
+#endif
--
1.5.6.5
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