--- linux-ia64-2.4/arch/ia64/kernel/perfmon.c.old	2003-09-10 11:36:15.000000000 -0700
+++ linux-ia64-2.4/arch/ia64/kernel/perfmon.c	2003-09-10 11:37:01.000000000 -0700
@@ -4013,6 +4013,10 @@
 	if (CTX_INHERIT_MODE(ctx) == PFM_FL_INHERIT_ONCE) {
 		nctx->ctx_fl_inherit = PFM_FL_INHERIT_NONE;
 		DBprintk(("downgrading to INHERIT_NONE for [%d]\n", task->pid));
+		/*
+		 * downgrade parent: once means only first child!
+		 */
+		ctx->ctx_fl_inherit = PFM_FL_INHERIT_NONE;
 	}
 	/*
 	 * task is not yet visible in the tasklist, so we do