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Operating Systems Linux Red Hat Could interrupt disabled cause "opreport error: No sample file found"? Post 302610449 by manustone on Wednesday 21st of March 2012 09:32:20 AM
Old 03-21-2012
Could interrupt disabled cause "opreport error: No sample file found"?

Hi All

I would like to profile my application with oprofile but I can't since no samples are collected.

The kernel of my app is 2.6 on RED HAT Enterprise 5.3 (Tikanga) so OProfile is setup in timer interrupt mode

Code:
        # opcontrol --list-events
        Using timer interrupt.

I cannot understand why this is happening. Could it be something related to the NMI interrupts?

Code:
       more /proc/interrupts |grep NMI
       NMI:   0  0  0 ..all zeros...  0  0  Non-maskable interrupts

Also reading this value I get 0

Code:
       cat /proc/sys/kernel/nmi_watchdog
       0

This is telling me that interrupts are disabled so, quoting Oprofile manual "this is not able to profile code that has interrupts disabled".
If I want to make oprofile running it is enough to edit the file /boot/grub/menu.lst and add nmi_watchdog=1?

Before doing this change do you know what could happen to the OS by adding this entry? I don't want to mess up the machine.

Thanks

Code:
        uname -a # details about my machine
        Linux lndbxdev01 2.6.24.7-108.el5rt #1 SMP PREEMPT RT Mon Mar 23 10:58:10 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux

 

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Locale::Codes::LangVar(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangVar(3pm)

NAME
Locale::Codes::LangVar - standard codes for language variation identification SYNOPSIS
use Locale::Codes::LangVar; $lvar = code2langvar('acm'); # $lvar gets 'Mesopotamian Arabic' $code = langvar2code('Mesopotamian Arabic'); # $code gets 'acm' @codes = all_langvar_codes(); @names = all_langvar_names(); DESCRIPTION
The "Locale::Codes::LangVar" module provides access to standard codes used for identifying language variations, such as those as defined in the IANA language registry. Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default IANA language registry codes will be used. SUPPORTED CODE SETS
There are several different code sets you can use for identifying language variations. A code set may be specified using either a name, or a constant that is automatically exported by this module. For example, the two are equivalent: $lvar = code2langvar('en','alpha-2'); $lvar = code2langvar('en',LOCALE_CODE_ALPHA_2); The codesets currently supported are: alpha This is the set of alphanumeric codes from the IANA language registry, such as 'arevela' for Eastern Armenian. This code set is identified with the symbol "LOCALE_LANGVAR_ALPHA". This is the default code set. ROUTINES
code2langvar ( CODE [,CODESET] ) langvar2code ( NAME [,CODESET] ) langvar_code2code ( CODE ,CODESET ,CODESET2 ) all_langvar_codes ( [CODESET] ) all_langvar_names ( [CODESET] ) Locale::Codes::LangVar::rename_langvar ( CODE ,NEW_NAME [,CODESET] ) Locale::Codes::LangVar::add_langvar ( CODE ,NAME [,CODESET] ) Locale::Codes::LangVar::delete_langvar ( CODE [,CODESET] ) Locale::Codes::LangVar::add_langvar_alias ( NAME ,NEW_NAME ) Locale::Codes::LangVar::delete_langvar_alias ( NAME ) Locale::Codes::LangVar::rename_langvar_code ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangVar::add_langvar_code_alias ( CODE ,NEW_CODE [,CODESET] ) Locale::Codes::LangVar::delete_langvar_code_alias ( CODE [,CODESET] ) These routines are all documented in the Locale::Codes::API man page. SEE ALSO
Locale::Codes The Locale-Codes distribution. Locale::Codes::API The list of functions supported by this module. http://www.iana.org/assignments/language-subtag-registry The IANA language subtag registry. AUTHOR
See Locale::Codes for full author history. Currently maintained by Sullivan Beck (sbeck@cpan.org). COPYRIGHT
Copyright (c) 2011-2013 Sullivan Beck This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.18.2 2014-01-06 Locale::Codes::LangVar(3pm)
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