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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
module/zfs/zfs_ioctl.c
-49
View File
@@ -247,55 +247,6 @@ static int zfs_fill_zplprops_root(uint64_t, nvlist_t *, nvlist_t *,
int zfs_set_prop_nvlist(const char *, zprop_source_t, nvlist_t *, nvlist_t *);
static int get_nvlist(uint64_t nvl, uint64_t size, int iflag, nvlist_t **nvp);
#if defined(HAVE_DECLARE_EVENT_CLASS)
void
__dprintf(const char *file, const char *func, int line, const char *fmt, ...)
{
const char *newfile;
size_t size = 4096;
char *buf = kmem_alloc(size, KM_SLEEP);
char *nl;
va_list adx;
/*
* Get rid of annoying prefix to filename.
*/
newfile = strrchr(file, '/');
if (newfile != NULL) {
newfile = newfile + 1; /* Get rid of leading / */
} else {
newfile = file;
}
va_start(adx, fmt);
(void) vsnprintf(buf, size, fmt, adx);
va_end(adx);
/*
* Get rid of trailing newline.
*/
nl = strrchr(buf, '\n');
if (nl != NULL)
*nl = '\0';
/*
* To get this data enable the zfs__dprintf trace point as shown:
*
* # Enable zfs__dprintf tracepoint, clear the tracepoint ring buffer
* $ echo 1 > /sys/module/zfs/parameters/zfs_flags
* $ echo 1 > /sys/kernel/debug/tracing/events/zfs/enable
* $ echo 0 > /sys/kernel/debug/tracing/trace
*
* # Dump the ring buffer.
* $ cat /sys/kernel/debug/tracing/trace
*/
DTRACE_PROBE4(zfs__dprintf,
char *, newfile, char *, func, int, line, char *, buf);
kmem_free(buf, size);
}
#endif /* HAVE_DECLARE_EVENT_CLASS */
static void
history_str_free(char *buf)
{