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| $ cat ruby_mcache.stp | |
| probe process("/usr/bin/ruby").mark("method__cache__clear") | |
| { | |
| module = kernel_string($arg1) | |
| if ($arg2) | |
| file = kernel_string($arg2) | |
| else | |
| file = "<internal>" | |
| line = $arg3 | |
| printf("%s(%d) %s %s:%d cleared `%s'\n", execname(), pid(), $$name, file, line, module) | |
| } | |
| $ sudo stap ruby_mcache.stp | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:169 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:170 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:169 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:170 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:169 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:170 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:169 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:170 cleared `OpenStruct' | |
| ruby(25410) method__cache__clear lib/ruby/2.1.0/ostruct.rb:169 cleared `OpenStruct' |
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You'll want e.g. user_string_quoted() rather than kernel_string() throughout.
See man function::user_string_quoted. Then you don't even need the $arg2 null check.