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no match while resolving probe point kernel.function("printk")
- From: Om <om dot turyx at gmail dot com>
- To: systemtap at sourceware dot org
- Date: Tue, 26 Aug 2008 13:41:58 -0700
- Subject: no match while resolving probe point kernel.function("printk")
I am trying to execute this script.
# printk : time printing toggle
#
global toggle
probe kernel.function("printk")
{
if(toggle == 1){
printf("printk_time: %d ", $printk_time)
$printk_time = 1 - $printk_time
printf("printk_time: %d", $printk_time)
}
exit()
}
probe begin
{
toggle = $1
}
# stap -v -u printk-time-toggle.stp 1
Pass 1: parsed user script and 38 library script(s) in
290usr/10sys/308real ms.
semantic error: write to target variable not permitted: identifier
'$printk_time' at printk-time-toggle.stp:8:4
semantic error: no match while resolving probe point
kernel.function("printk")
Pass 2: analyzed script: 1 probe(s), 1 function(s), 0 embed(s), 1
global(s) in 490usr/150sys/640real ms.
Pass 2: analysis failed. Try again with more '-v' (verbose) options.
When I comment out the statement $printk_time = 1 - $printk_time, it
compiles without complaining any semantic error.
# stap -v -u printk-time-toggle.stp 1
Pass 1: parsed user script and 38 library script(s) in
290usr/10sys/310real ms.
Pass 2: analyzed script: 2 probe(s), 7 function(s), 0 embed(s), 1
global(s) in 500usr/150sys/643real ms.
Pass 3: translated to C into
"/tmp/stapFgfNHR/stap_fc59a3f7e1709e761b6ba97c2107c611_2021.c" in
0usr/0sys/1real ms.
Pass 4: compiled C into "stap_fc59a3f7e1709e761b6ba97c2107c611_2021.ko"
in 2460usr/500sys/2874real ms.
Pass 5: starting run.
Pass 5: run completed in 60usr/70sys/5531real ms.
How can this happen?
# stap -V
SystemTap translator/driver (version 0.6.2/0.127 built 2008-03-27)
Copyright (C) 2005-2008 Red Hat, Inc. and others
This is free software; see the source for copying conditions.
# uname -a
Linux mpk12-etclab-158-187 2.6.23.17-88.fc7 #1 SMP Thu May 15 00:02:29
EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
Thanks,
Om.