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Add a 'debug.witness_trace' sysctl (and tunable) when DDB is present.

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This causes LOR and could-sleep messages to come with a stack trace.
This commit is contained in:
peter 2003-02-13 01:35:56 +00:00
parent e6756cd99a
commit 30c571736e
1 changed files with 16 additions and 2 deletions
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18
sys/kern/subr_witness.c
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@ -170,6 +170,16 @@ int witness_ddb = 0;
#endif
TUNABLE_INT("debug.witness_ddb", &witness_ddb);
SYSCTL_INT(_debug, OID_AUTO, witness_ddb, CTLFLAG_RW, &witness_ddb, 0, "");
/*
* When DDB is enabled and witness_trace is set to 1, it will cause the system
* to print a stack trace:
* - a lock heirarchy violation occurs
* - locks are held when going to sleep.
*/
int witness_trace = 1;
TUNABLE_INT("debug.witness_trace", &witness_trace);
SYSCTL_INT(_debug, OID_AUTO, witness_trace, CTLFLAG_RW, &witness_trace, 0, "");
#endif /* DDB */
#ifdef WITNESS_SKIPSPIN
@ -717,8 +727,12 @@ witness_lock(struct lock_object *lock, int flags, const char *file, int line)
out:
#ifdef DDB
if (witness_ddb && go_into_ddb)
Debugger(__func__);
if (go_into_ddb) {
if (witness_trace)
backtrace();
if (witness_ddb)
Debugger(__func__);
}
#endif /* DDB */
w->w_file = file;
w->w_line = line;