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Add dbgmsg kstat

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Internally ZFS keeps a small log to facilitate debugging.  By default
the log is disabled, to enable it set zfs_dbgmsg_enable=1.  The contents
of the log can be accessed by reading the /proc/spl/kstat/zfs/dbgmsg file.
Writing 0 to this proc file clears the log.

$ echo 1 >/sys/module/zfs/parameters/zfs_dbgmsg_enable
$ echo 0 >/proc/spl/kstat/zfs/dbgmsg
$ zpool import tank
$ cat /proc/spl/kstat/zfs/dbgmsg
1 0 0x01 -1 0 2492357525542 2525836565501
timestamp    message
1441141408   spa=tank async request task=1
1441141408   txg 70 open pool version 5000; software version 5000/5; ...
1441141409   spa=tank async request task=32
1441141409   txg 72 import pool version 5000; software version 5000/5; ...
1441141414   command: lt-zpool import tank

Note the zfs_dbgmsg() and dprintf() functions are both now mapped to
the same log.  As mentioned above the kernel debug log can be accessed
though the /proc/spl/kstat/zfs/dbgmsg kstat.  For user space consumers
log messages are immediately written to stdout after applying the
ZFS_DEBUG environment variable.

$ ZFS_DEBUG=on ./cmd/ztest/ztest -V

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ned Bass <bass6@llnl.gov>
Closes #3728
This commit is contained in:
Brian Behlendorf
2015-09-01 13:19:10 -07:00
parent 0500e835af
commit 3b36f8319d
6 changed files with 201 additions and 144 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/trace_dbgmsg.h
-26
View File
@@ -36,32 +36,6 @@
* be guarded separately.
*/
/*
* Generic support for one argument tracepoints of the form:
*
* DTRACE_PROBE1(...,
* const char *, ...);
*/
DECLARE_EVENT_CLASS(zfs_dbgmsg_class,
TP_PROTO(const char *msg),
TP_ARGS(msg),
TP_STRUCT__entry(
__string(msg, msg)
),
TP_fast_assign(
__assign_str(msg, msg);
),
TP_printk("%s", __get_str(msg))
);
#define DEFINE_DBGMSG_EVENT(name) \
DEFINE_EVENT(zfs_dbgmsg_class, name, \
TP_PROTO(const char *msg), \
TP_ARGS(msg))
DEFINE_DBGMSG_EVENT(zfs_zfs__dbgmsg);
/*
* Generic support for four argument tracepoints of the form:
*
include/sys/zfs_debug.h
+4 -8
View File
@@ -51,28 +51,24 @@ extern int zfs_free_leak_on_eio;
#define ZFS_DEBUG_ZIO_FREE (1<<6)
#define ZFS_DEBUG_HISTOGRAM_VERIFY (1<<7)
#if defined(HAVE_DECLARE_EVENT_CLASS) || !defined(_KERNEL)
extern void __dprintf(const char *file, const char *func,
int line, const char *fmt, ...);
#define dprintf(...) \
if (zfs_flags & ZFS_DEBUG_DPRINTF) \
__dprintf(__FILE__, __func__, __LINE__, __VA_ARGS__)
#else
#define dprintf(...) ((void)0)
#endif /* HAVE_DECLARE_EVENT_CLASS || !_KERNEL */
__dprintf(__FILE__, __func__, __LINE__, __VA_ARGS__)
#define zfs_dbgmsg(...) \
__dprintf(__FILE__, __func__, __LINE__, __VA_ARGS__)
extern void zfs_panic_recover(const char *fmt, ...);
typedef struct zfs_dbgmsg {
list_node_t zdm_node;
time_t zdm_timestamp;
int zdm_size;
char zdm_msg[1]; /* variable length allocation */
} zfs_dbgmsg_t;
extern void zfs_dbgmsg_init(void);
extern void zfs_dbgmsg_fini(void);
extern void zfs_dbgmsg(const char *fmt, ...);
extern void zfs_dbgmsg_print(const char *tag);
#ifndef _KERNEL
extern int dprintf_find_string(const char *string);