diff options
| author | Brian Behlendorf <[email protected]> | 2015-09-01 13:19:10 -0700 |
|---|---|---|
| committer | Brian Behlendorf <[email protected]> | 2015-09-04 16:08:14 -0700 |
| commit | 3b36f8319d56842c85782e7842218a7499f3cf16 (patch) | |
| tree | dfb586465b239054d8cba80200059ea55882978f /man/man5 | |
| parent | 0500e835af3ea1f3abe27a572f7b2328b4cde386 (diff) | |
Add dbgmsg kstat
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 <[email protected]>
Signed-off-by: Ned Bass <[email protected]>
Closes #3728
Diffstat (limited to 'man/man5')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index 27b5346e2..6d4a8c304 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -610,6 +610,31 @@ Use \fB1\fR for yes (default) and \fB0\fR for no. .sp .ne 2 .na +\fBzfs_dbgmsg_enable\fR (int) +.ad +.RS 12n +Internally ZFS keeps a small log to facilitate debugging. By default the log +is disabled, to enable it set this option to 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. +.sp +Default value: \fB0\fR. +.RE + +.sp +.ne 2 +.na +\fBzfs_dbgmsg_maxsize\fR (int) +.ad +.RS 12n +The maximum size in bytes of the internal ZFS debug log. +.sp +Default value: \fB4M\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_dbuf_state_index\fR (int) .ad .RS 12n |