Re: [RFC] perf probe: Fix offline module name missmatch issue

From: Ravi Bangoria
Date: Tue Apr 26 2016 - 05:01:06 EST


Thanks Masami,

On Tuesday 26 April 2016 07:49 AM, Masami Hiramatsu wrote:
On Tue, 26 Apr 2016 06:24:38 +0900
Masami Hiramatsu <mhiramat@xxxxxxxxxx> wrote:
+/*
+ * NOTE:
+ * '.gnu.linkonce.this_module' section of kernel module elf directly
+ * maps to 'struct module' from linux/module.h. This section contains
+ * actual module name which will be used by kernel after loading it.
+ * But, we cannot use 'struct module' here since linux/module.h is not
+ * exposed to user-space. Offset of 'name' has remained same from long
+ * time, so hardcoding it here.
+ */
BTW, is there no way to get the module name avoiding to access
this "hidden" data structure?
This looks very tricky way...

So this is the same approach kernel use to find module name when module is
loaded. Please refer this function for more detail:

kernel/module.c :: static struct module *setup_load_info(...)

Regards,
Ravi