Re: [Crash-utility] crash extensions help
----- Original Message -----
Hi Dave,
I found you from https://www.redhat.com/mailman/listinfo/crash-utility.
I was really impressed with your contribution to the crash utility.
I tried subscribing to the crash utility mailing list. But no luck.
Sorry about that -- I was on vacation for a couple of weeks until today.
You're on the list now.
I started writing the crash extensions,
I am unable to read the all the members of task_struct and mm_struct structures.
I am trying to read mm->hiwater_vm, the defs.h header file do not have
struct_mm_hiwater_mm variable as a offset_table member.
Could you please suggest me the ways that I could read all the members of
the task_struct and mm_struct.
Thanks in Advance.
--
Thanks & Regards
Rupesh P
For structure members that are not in the built-in offset_table, you can just
use MEMBER_OFFSET() directly, for example:
MEMBER_OFFSET("mm_struct", "hiwater_rss")
which returns a long offset value. But be aware that it returns -1 on a failure,
so you should check for success/failure before using the return value.
The built-in OFFSET() macro verifies that the the pre-initialized offset value
read by MEMBER_OFFSET() and stored in the offset_table is not a -1, and if it is,
it will generate a FATAL error. In an extension module, it's up to you to do the
verification.
Dave