Author: markj
Date: Sat Dec 10 03:13:11 2016
New Revision: 309786
URL: https://svnweb.freebsd.org/changeset/base/309786
Log:
Don't create FBT probes for lock owner methods.
These functions may be called in DTrace probe context, so they cannot be
safely traced. Moreover, they are currently only used by DTrace, so their
corresponding FBT probes are not particularly useful.
MFC after: 2 weeks
Modified:
head/sys/cddl/dev/fbt/fbt.c
Modified: head/sys/cddl/dev/fbt/fbt.c
==============================================================================
--- head/sys/cddl/dev/fbt/fbt.c Sat Dec 10 03:11:05 2016 (r309785)
+++ head/sys/cddl/dev/fbt/fbt.c Sat Dec 10 03:13:11 2016 (r309786)
@@ -127,6 +127,15 @@ fbt_excluded(const char *name)
}
/*
+ * Lock owner methods may be called from probe context.
+ */
+ if (strcmp(name, "owner_mtx") == 0 ||
+ strcmp(name, "owner_rm") == 0 ||
+ strcmp(name, "owner_rw") == 0 ||
+ strcmp(name, "owner_sx") == 0)
+ return (1);
+
+ /*
* When DTrace is built into the kernel we need to exclude
* the FBT functions from instrumentation.
*/
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