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-rw-r--r--Documentation/trace/events.txt15
1 files changed, 12 insertions, 3 deletions
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index bb24c2a0e870..37732a220d33 100644
--- a/Documentation/trace/events.txt
+++ b/Documentation/trace/events.txt
@@ -183,13 +183,22 @@ The relational-operators depend on the type of the field being tested:
The operators available for numeric fields are:
-==, !=, <, <=, >, >=
+==, !=, <, <=, >, >=, &
And for string fields they are:
-==, !=
+==, !=, ~
-Currently, only exact string matches are supported.
+The glob (~) only accepts a wild card character (*) at the start and or
+end of the string. For example:
+
+ prev_comm ~ "*sh"
+ prev_comm ~ "sh*"
+ prev_comm ~ "*sh*"
+
+But does not allow for it to be within the string:
+
+ prev_comm ~ "ba*sh" <-- is invalid
5.2 Setting filters
-------------------