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Diffstat (limited to 'Documentation/trace/events.rst')
| -rw-r--r-- | Documentation/trace/events.rst | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/Documentation/trace/events.rst b/Documentation/trace/events.rst index 8b33850b8bf9..f5fcb8e1218f 100644 --- a/Documentation/trace/events.rst +++ b/Documentation/trace/events.rst @@ -207,6 +207,18 @@ field name:: As the kernel will have to know how to retrieve the memory that the pointer is at from user space. +You can convert any long type to a function address and search by function name:: + + call_site.function == security_prepare_creds + +The above will filter when the field "call_site" falls on the address within +"security_prepare_creds". That is, it will compare the value of "call_site" and +the filter will return true if it is greater than or equal to the start of +the function "security_prepare_creds" and less than the end of that function. + +The ".function" postfix can only be attached to values of size long, and can only +be compared with "==" or "!=". + 5.2 Setting filters ------------------- |