README: Add predicates

a2a689b4 · Alastair Robertson · d9d1f691 · a2a689b4
Commit a2a689b4 authored Apr 29, 2018 by Alastair Robertson
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@@ -176,6 +176,11 @@ Some probe types allow wildcards to be used when attaching a probe:

 `kprobe:SyS_* { ... }`

+### Predicates
+Define conditions for which a probe should be executed:
+
+`kprobe:sys_open / uid == 0 / { ... }`
+
 ## Builtins
 The following variables and functions are available for use in bpftrace scripts: