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accessing target globals with systemtap
- From: Jeff Haran <Jeff dot Haran at citrix dot com>
- To: "'systemtap at sourceware dot org'" <systemtap at sourceware dot org>
- Date: Tue, 11 Sep 2012 15:12:38 -0700
- Subject: accessing target globals with systemtap
Hi,
After reading the documentation, I assumed the following would result in the display of the address of the kernel global named arp_tbl:
[root@s01b06 jharan]# cat temp.stp
probe begin
{
printf("arp_tbl %p\n", @var("arp_tbl@net/ipv4/arp.c"))
}
But when I try to compile it, I get this:
[root@s01b06 jharan]# stap -v -r 2.6.32-220.el6.x86_64 temp.stp -m temp -p 4
parse error: unknown statistic operator @var
saw: identifier '@var' at temp.stp:3:25
source: printf("arp_tbl %p\n", @var("arp_tbl@net/ipv4/arp.c"))
^
parse error: expected statement
saw: temp.stp EOF
2 parse errors.
Pass 1: parsed user script and 77 library script(s) using 97284virt/22908res/2984shr kb, in 140usr/0sys/144real ms.
Pass 1: parse failed. Try again with another '--vp 1' option.
[root@s01b06 jharan]#
I am guessing that's because of my older version of stap:
[root@s01b06 jharan]# stap --version
Systemtap translator/driver (version 1.6/0.152 non-git sources)
Copyright (C) 2005-2011 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
enabled features: AVAHI LIBRPM LIBSQLITE3 NSS BOOST_SHARED_PTR TR1_UNORDERED_MAP NLS
[root@s01b06 jharan]#
Is there a way for me to get access to a kernel global in my version of stap?
Or do I need to upgrade in order to do this?
Or am I missing something more basic?
Thanks,
Jeff Haran