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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
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cmd/ztest/ztest.c
-6
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@@ -827,9 +827,6 @@ ztest_kill(ztest_shared_t *zs)
spa_config_sync(ztest_spa, B_FALSE, B_FALSE);
mutex_exit(&spa_namespace_lock);
if (ztest_opts.zo_verbose >= 3)
zfs_dbgmsg_print(FTAG);
(void) kill(getpid(), SIGKILL);
}
@@ -5894,9 +5891,6 @@ ztest_run(ztest_shared_t *zs)
zs->zs_alloc = metaslab_class_get_alloc(spa_normal_class(spa));
zs->zs_space = metaslab_class_get_space(spa_normal_class(spa));
if (ztest_opts.zo_verbose >= 3)
zfs_dbgmsg_print(FTAG);
umem_free(tid, ztest_opts.zo_threads * sizeof (kt_did_t));
/* Kill the resume thread */