Add a new sched_clear_name() method to the scheduler interface to clear

the cached name used for KTR_SCHED traces when a thread's name changes.
This way KTR_SCHED traces (and thus schedgraph) will notice when a thread's
name changes, most commonly via execve().

MFC after:	2 weeks

1 files changed, 6 insertions, 0 deletions

diff --git a/sys/kern/kern_kthread.c b/sys/kern/kern_kthread.c
index dc3fdab..9dcdeb0 100644
--- a/sys/kern/kern_kthread.c
+++ b/sys/kern/kern_kthread.c
@@ -115,6 +115,9 @@ kproc_create(void (*func)(void *), void *arg,
 	va_start(ap, fmt);
 	vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap);
 	va_end(ap);
+#ifdef KTR
+	sched_clear_tdname(td);
+#endif
 
 	/* call the processes' main()... */
 	cpu_set_fork_handler(td, func, arg);
@@ -453,6 +456,9 @@ kproc_kthread_add(void (*func)(void *), void *arg,
 		va_start(ap, fmt);
 		vsnprintf(td->td_name, sizeof(td->td_name), fmt, ap);
 		va_end(ap);
+#ifdef KTR
+		sched_clear_tdname(td);
+#endif
 		return (0); 
 	}
 	va_start(ap, fmt);