Re: [lttng-dev] Regarding CtfTmfTrace reader in TMF and LTTng's new trace
Yes, it is working in TMF views. The index folders are shown separately
in TMF and contents of the new trace format are also complete.
I looked at the TmfStateSystemAnalysisModule class, and in particular
StateSystemEventRequest class in it at the end. I understand this class
StateSystemEventRequest but how is this ITmfStateProvider passed to the
constructor StateSystemEventRequest(ITmfState
Provider sp). I don't see any direct implementation of ITmfStateProvider
there.
Just to give a bit of context, in my scenario, I am interested in directly
reading traces from the hard disk without using the views in TMF. If there
are many traces in the hard disk, my program reads them one by one, perform
its analysis on them, and closes them. My program would pass the path of
the trace folder to a class implementing trace reader and would take the
contents (Events) one by one from that class.
Thanks,
Shariyar
Date: Mon, 20 Oct 2014 10:37:26 -0400
From: Genevi?ve Bastien gbastien+lt...@versatic.net
To: lttng-dev@lists.lttng.org
Subject: Re: [lttng-dev] Regarding CtfTmfTrace reader in TMF and
LTTng's new trace format
Message-ID: 54451e26.4090...@versatic.net
Content-Type: text/plain; charset=iso-8859-1
Hi Shariyar,
Can your trace be read all right if you import it in TMF (Trace Compass)
and open it normally in it? Do all events appear in the events table?
There were changes to improve the CTF reading part recently and somebody
reported a bug with traces taken on ARM where events are not read
correctly, but the bug is not due to the index files.
If the trace is read correctly by TMF, may I suggest that you use a
TmfEventRequest instead of your own iterator to read the trace events.
This is the preferred way for now, most analysis do that and you don't
have to bother about trace types, iterators, etc. For an example, see
the class TmfStateSystemAnalysisModule, at the end of the file is the
event request class and the build() method from the class that uses it.
Genevi?ve
On 14-10-17 11:31 AM, Shariyar wrote:
Hi,
I am trying to read the traces generated in the latest format by
LTTng--i.e., a trace having an index folder (with index files) and
the files for every channel. I am reading these type of traces in my
Java program by using the CtfTmfTrace class that exists in TMF. I have
been using this class and its associated classes (e.g., CtfIterator
and CtfTmfEvent) to successfully read the traces in previous trace
format of LTTng (i.e., the trace with only files for channels and no
index folder/files).
Now, I cannot read the latest trace format with these classes. In
fact, I am only able to read 10-20 events from the latest trace
format. These events are namely power_cpu_idle, exit_syscall, and
sys_ioctl. Can you kindly tell me which classes to use to read both
kind of trace formats; old ones and the new ones?
I have also pasted below my current source code to read LTTng traces.
/**
* Constructor to initialize the trace
* @param filePath file Name
* @throws TmfTraceException An exception during trace reading
*/
public CTFSystemCallIterator(String filePath) throws
TmfTraceException {
fTrace = new CtfTmfTrace();
fTrace.initTrace(null, filePath, CtfTmfEvent.class);
fTraceIterator = fTrace.createIterator();
}
/**
* Moves Iterator to the next event, and returns true if the iterator
* can advance or false if the iterator cannot advance
**/
@Override
public boolean advance() {
boolean isAdvance = true;
fSyscall = ; //$NON-NLS-1$
do {
CtfTmfEvent event = fTraceIterator.getCurrentEvent();
System.out.println(event);
fSyscall = handleSysEntryEvent(event);
isAdvance = fTraceIterator.advance();
} while (fSyscall.isEmpty() isAdvance);
if (!isAdvance) {
fIsDispose = true;
fTrace.dispose();
}
return isAdvance;
}
Thanks,
Shariyar
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Re: [lttng-dev] Regarding CtfTmfTrace reader in TMF and LTTng's new trace
Hi Genevive,
I have found the sollution. Actually, I have replaced the CtfEvent and
CtfIterator by ITmfEvent and ITmfContext. This allows me to read the both
the latest and old format. The sample code is attached below, in case if
some one comes across the same problem.
Best regards,
Shariyar
*private String fSyscall;private CtfTmfTrace fTrace;private
ITmfContext fCtxt;/** * Constructor to initialize the
trace * @param filePath file Name * @throws TmfTraceException An
exception during trace reading */public
CTFSystemCallIterator(String filePath) throws TmfTraceException {
fTrace = new CtfTmfTrace();fTrace.initTrace(null, filePath,
CtfTmfEvent.class);fCtxt=fTrace.seekEvent(0);
//fTraceIterator = fTrace.createIterator(); // don't use CtfIterator
}/** * Moves Iterator to the next event, and returns true if the
iterator * can advance or false if the iterator cannot advance
**/@Overridepublic boolean advance() {boolean isAdvance =
true;fSyscall = ; //$NON-NLS-1$ITmfEvent event;
do{if ((event=fTrace.getNext(fCtxt))!=null){fSyscall =
handleSysEntryEvent(event);//returns the sys call (entry) event
}elseisAdvance=false;} while
(fSyscall.isEmpty() isAdvance==true);if
(!isAdvance) close();return isAdvance;}*
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[lttng-dev] Regarding CtfTmfTrace reader in TMF and LTTng's new trace format
Hi,
I am trying to read the traces generated in the latest format by
LTTng--i.e., a trace having an index folder (with index files) and the
files for every channel. I am reading these type of traces in my Java
program by using the CtfTmfTrace class that exists in TMF. I have been
using this class and its associated classes (e.g., CtfIterator
and CtfTmfEvent) to successfully read the traces in previous trace format
of LTTng (i.e., the trace with only files for channels and no index
folder/files).
Now, I cannot read the latest trace format with these classes. In fact, I
am only able to read 10-20 events from the latest trace format. These
events are namely power_cpu_idle, exit_syscall, and sys_ioctl. Can you
kindly tell me which classes to use to read both kind of trace formats;
old ones and the new ones?
I have also pasted below my current source code to read LTTng traces.
/**
* Constructor to initialize the trace
* @param filePath file Name
* @throws TmfTraceException An exception during trace reading
*/
public CTFSystemCallIterator(String filePath) throws TmfTraceException {
fTrace = new CtfTmfTrace();
fTrace.initTrace(null, filePath, CtfTmfEvent.class);
fTraceIterator = fTrace.createIterator();
}
/**
* Moves Iterator to the next event, and returns true if the iterator
* can advance or false if the iterator cannot advance
**/
@Override
public boolean advance() {
boolean isAdvance = true;
fSyscall = ; //$NON-NLS-1$
do {
CtfTmfEvent event = fTraceIterator.getCurrentEvent();
System.out.println(event);
fSyscall = handleSysEntryEvent(event);
isAdvance = fTraceIterator.advance();
} while (fSyscall.isEmpty() isAdvance);
if (!isAdvance) {
fIsDispose = true;
fTrace.dispose();
}
return isAdvance;
}
Thanks,
Shariyar
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Re: [lttng-dev] LTTng not generating trace contents
No it didn't install correctly.It is generating a crash report and lttng-module-dkms exists in it too. Regards, Shariyar On Mon, Jul 7, 2014 at 2:04 PM, Alexandre Montplaisir alexmon...@voxpopuli.im wrote: Hi, Could you just do $ sudo apt-get install --reinstall lttng-modules-dkms and check in the output if you have any errors, or if it really installs successfully? Maybe Ubuntu's patches already trickled down to 12.04 and you might be hitting https://bugs.lttng.org/issues/814 Thanks, Alexandre On 07/07/2014 01:43 PM, Shariyar wrote: lttng --version, lttng (LTTng Trace Control) 2.4.1 - Époque Opaque lttng-sessiond --version 2.4.1 I removed all LTTng packages from the system by manually searching in dpkg and reinstalled it as follows: sudo apt-get install lttng-tools lttng-modules-dkms babeltrace The ppa in the system is: http://ppa.launchpad.net/lttng/ppa/ubuntu Now, I get the following error: sudo lttng list -k Error: Unable to list kernel events: Kernel tracer not available Error: Command error I have encountered this problem on two different systems running Ubuntu 12.04, after the update of system and LTTng Regards, Shariyar On Mon, Jul 7, 2014 at 11:42 AM, Thibault, Daniel daniel.thiba...@drdc-rddc.gc.ca wrote: -- Date: Sun, 6 Jul 2014 18:49:51 -0400 From: Shariyar syed.shari...@gmail.com syed.shari...@gmail.com I am having a problem in generating a kernel trace using the latest LTTng on Ubuntu 12.04. It was working fine previously but when I updated LTTng it stopped generating the trace contents. I did an uninstall and reinstall but it didn't work either. -- Please define what you mean by the latest LTTng. What are the versions? ($ lttng --version, $ lttng-sessiond --version) Daniel U. Thibault Protection des systèmes et contremesures (PSC) | Systems Protection Countermeasures (SPC) Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS) RDDC - Centre de recherches de Valcartier | DRDC - Valcartier Research Centre 2459 route de la Bravoure Québec QC G3J 1X5 CANADA Vox : (418) 844-4000 x4245 Fax : (418) 844-4538 NAC : 918V QSDJ http://www.travelgis.com/map.asp?addr=918V%20QSDJ http://www.travelgis.com/map.asp?addr=918V%20QSDJ Gouvernement du Canada | Government of Canadahttp://www.valcartier.drdc-rddc.gc.ca/ http://www.valcartier.drdc-rddc.gc.ca/ ___ lttng-dev mailing listlttng-dev@lists.lttng.orghttp://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
[lttng-dev] LTTng not generating trace contents
Hi, I am having a problem in generating a kernel trace using the latest LTTng on Ubuntu 12.04. It was working fine previously but when I updated LTTng it stopped generating the trace contents. I did an uninstall and reinstall but it didn't work either. In particular, I am able to create a session, list all kernel events, start a trace and stop a trace. My user is also in the tracing group. However, there are no contents in the trace files generated for every CPU in the system. Initially, the Babeltrace and the TMF both gave errors and when I explored the trace folder I found out that they are empty files.The metadata and index files do show some contents; however, nothing exists in the channelx_x files. What would be wrong? Please let me know. Regards, Shariyar ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
Re: [lttng-dev] liblttng-ust-cyg-profile.so not found
Download and install the following UST packages but first remove the already installed versions. For other LTTng packages, you can reinstall from your previous repository or from here. http://packages.debian.org/sid/liblttng-ust-ctl2 http://packages.debian.org/sid/liblttng-ust0 http://packages.debian.org/unstable/liblttng-ust-dev On Wed, Jan 29, 2014 at 9:26 AM, Thibault, Daniel daniel.thiba...@drdc-rddc.gc.ca wrote: -- Date: Tue, 28 Jan 2014 11:37:20 -0500 From: Shariyar syed.shari...@gmail.com I am trying to collect function entry and exit points in a trace. I have followed the instructions written on the following man page: http://manpages.ubuntu.com/manpages/trusty/man3/lttng-ust-cyg-profile.3.html . In my system, UST tracepoint tracing is working fine and I am able to collect traces with the statically typed tracepoints in the code. However, there is no liblttng-ust-cyg-profile.so in my system and I get an error when I execute the following: *LD_PRELOAD=liblttng-ust-cyg-profile.so* appname -- Date: Tue, 28 Jan 2014 12:29:43 -0500 From: Suchakrapani Datt Sharma suchakrapani.sha...@polymtl.ca Check if the liblttng-ust-cyg-profile.so is present in system using 'locate'. On my system its in /usr/lib64 Then give the absolute path - *LD_PRELOAD=/usr/lib64/liblttng-ust-cyg-profile.so* appname -- Date: Tue, 28 Jan 2014 12:32:14 -0500 From: Shariyar syed.shari...@gmail.com It is not present in the system even after reinstalling ust libs from PPA. I am working on Ubuntu 12.04.1 LTS, 64 bit. -- Date: Tue, 28 Jan 2014 12:45:34 -0500 From: Alexandre Montplaisir alexmon...@voxpopuli.im On Ubuntu/Debian, there is no lib64, it's /usr/lib/x86_64-linux-gnu/ If you installed UST from the distro package, it should be at: /usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so.0 (the .so symlink is only installed by the -dev package) If you installed from source, it would be at: /usr/local/lib/liblttng-ust-cyg-profile.so Quick tip: you can use: dpkg -L liblttng-ust0 to list the files installed by a package. -- Date: Tue, 28 Jan 2014 16:19:09 -0500 From: Shariyar syed.shari...@gmail.com dpkg -L liblttng-ust0 gives the following; i.e., no liblttng-ust-cyg-profile.so /usr/share/man/man3/lttng-ust-cyg-profile.3.gz Which package did you install, and whence came it? Daniel U. Thibault Protection des systèmes et contremesures (PSC) | Systems Protection Countermeasures (SPC) Cyber sécurité pour les missions essentielles (CME) | Mission Critical Cyber Security (MCCS) R D pour la défense Canada - Valcartier (RDDC Valcartier) | Defence RD Canada - Valcartier (DRDC Valcartier) 2459 route de la Bravoure Québec QC G3J 1X5 CANADA Vox : (418) 844-4000 x4245 Fax : (418) 844-4538 NAC : 918V QSDJ http://www.travelgis.com/map.asp?addr=918V%20QSDJ Gouvernement du Canada | Government of Canada http://www.valcartier.drdc-rddc.gc.ca/ ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
[lttng-dev] liblttng-ust-cyg-profile.so not found
Hi, I am trying to collect function entry and exit points in a trace. I have followed the instructions written on the following man page: http://manpages.ubuntu.com/manpages/trusty/man3/lttng-ust-cyg-profile.3.html. In my system, UST tracepoint tracing is working fine and I am able to collect traces with the statically typed tracepoints in the code. However, there is no liblttng-ust-cyg-profile.so in my system and I get an error when I execute the following: *LD_PRELOAD=liblttng-ust-cyg-profile.so* appname Please let me know how to get it to work? Thanks, Shariyar ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
Re: [lttng-dev] liblttng-ust-cyg-profile.so not found
It is not present in the system even after reinstalling ust libs from PPA. I am working on Ubuntu 12.04.1 LTS, 64 bit. Regards, Shariyar On Tue, Jan 28, 2014 at 12:29 PM, Suchakrapani Datt Sharma suchakrapani.sha...@polymtl.ca wrote: Check if the liblttng-ust-cyg-profile.so is present in system using 'locate'. On my system its in /usr/lib64 Then give the absolute path - *LD_PRELOAD=/usr/lib64/liblttng-ust-cyg-profile.so* appname This works for me. -- Suchakra Quoting Shariyar syed.shari...@gmail.com: Hi, I am trying to collect function entry and exit points in a trace. I have followed the instructions written on the following man page: http://manpages.ubuntu.com/manpages/trusty/man3/lttng-ust-cyg-profile.3.html . In my system, UST tracepoint tracing is working fine and I am able to collect traces with the statically typed tracepoints in the code. However, there is no liblttng-ust-cyg-profile.so in my system and I get an error when I execute the following: *LD_PRELOAD=liblttng-ust-cyg-profile.so* appname Please let me know how to get it to work? Thanks, Shariyar ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
Re: [lttng-dev] liblttng-ust-cyg-profile.so not found
dpkg -L liblttng-ust0 gives the following; i.e., no liblttng-ust-cyg-profile.so /. /usr /usr/share /usr/share/doc /usr/share/doc/liblttng-ust0 /usr/share/doc/liblttng-ust0/changelog.gz /usr/share/doc/liblttng-ust0/copyright /usr/share/man /usr/share/man/man3 /usr/share/man/man3/lttng-ust.3.gz /usr/share/man/man3/lttng-ust-cyg-profile.3.gz /usr/lib /usr/lib/x86_64-linux-gnu /usr/lib/x86_64-linux-gnu/liblttng-ust-tracepoint.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-fork.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-libc-wrapper.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-ctl.so.2.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-tracepoint.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-libc-wrapper.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-fork.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-ctl.so.2 On Tue, Jan 28, 2014 at 12:45 PM, Alexandre Montplaisir alexmon...@voxpopuli.im wrote: On Ubuntu/Debian, there is no lib64, it's /usr/lib/x86_64-linux-gnu/ If you installed UST from the distro package, it should be at: /usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so.0 (the .so symlink is only installed by the -dev package) If you installed from source, it would be at: /usr/local/lib/liblttng-ust-cyg-profile.so Quick tip: you can use: dpkg -L liblttng-ust0 to list the files installed by a package. Cheers, Alexandre On 14-01-28 12:32 PM, Shariyar wrote: It is not present in the system even after reinstalling ust libs from PPA. I am working on Ubuntu 12.04.1 LTS, 64 bit. Regards, Shariyar On Tue, Jan 28, 2014 at 12:29 PM, Suchakrapani Datt Sharma suchakrapani.sha...@polymtl.ca wrote: Check if the liblttng-ust-cyg-profile.so is present in system using 'locate'. On my system its in /usr/lib64 Then give the absolute path - *LD_PRELOAD=/usr/lib64/liblttng-ust-cyg-profile.so* appname This works for me. -- Suchakra Quoting Shariyar syed.shari...@gmail.com: Hi, I am trying to collect function entry and exit points in a trace. I have followed the instructions written on the following man page: http://manpages.ubuntu.com/manpages/trusty/man3/lttng-ust-cyg-profile.3.html . In my system, UST tracepoint tracing is working fine and I am able to collect traces with the statically typed tracepoints in the code. However, there is no liblttng-ust-cyg-profile.so in my system and I get an error when I execute the following: *LD_PRELOAD=liblttng-ust-cyg-profile.so* appname Please let me know how to get it to work? Thanks, Shariyar ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
Re: [lttng-dev] liblttng-ust-cyg-profile.so not found
Okay. I have found the solution: I used another Debain repository to download and install all the packages. I am wondering, is there any tool/script that matches function addresses with the symbol names from nm, and generates a new CTF file? Regards, Shariyar On Tue, Jan 28, 2014 at 4:19 PM, Shariyar syed.shari...@gmail.com wrote: dpkg -L liblttng-ust0 gives the following; i.e., no liblttng-ust-cyg-profile.so /. /usr /usr/share /usr/share/doc /usr/share/doc/liblttng-ust0 /usr/share/doc/liblttng-ust0/changelog.gz /usr/share/doc/liblttng-ust0/copyright /usr/share/man /usr/share/man/man3 /usr/share/man/man3/lttng-ust.3.gz /usr/share/man/man3/lttng-ust-cyg-profile.3.gz /usr/lib /usr/lib/x86_64-linux-gnu /usr/lib/x86_64-linux-gnu/liblttng-ust-tracepoint.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-fork.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-libc-wrapper.so.0.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-ctl.so.2.0.0 /usr/lib/x86_64-linux-gnu/liblttng-ust.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-tracepoint.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-libc-wrapper.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-fork.so.0 /usr/lib/x86_64-linux-gnu/liblttng-ust-ctl.so.2 On Tue, Jan 28, 2014 at 12:45 PM, Alexandre Montplaisir alexmon...@voxpopuli.im wrote: On Ubuntu/Debian, there is no lib64, it's /usr/lib/x86_64-linux-gnu/ If you installed UST from the distro package, it should be at: /usr/lib/x86_64-linux-gnu/liblttng-ust-cyg-profile.so.0 (the .so symlink is only installed by the -dev package) If you installed from source, it would be at: /usr/local/lib/liblttng-ust-cyg-profile.so Quick tip: you can use: dpkg -L liblttng-ust0 to list the files installed by a package. Cheers, Alexandre On 14-01-28 12:32 PM, Shariyar wrote: It is not present in the system even after reinstalling ust libs from PPA. I am working on Ubuntu 12.04.1 LTS, 64 bit. Regards, Shariyar On Tue, Jan 28, 2014 at 12:29 PM, Suchakrapani Datt Sharma suchakrapani.sha...@polymtl.ca wrote: Check if the liblttng-ust-cyg-profile.so is present in system using 'locate'. On my system its in /usr/lib64 Then give the absolute path - *LD_PRELOAD=/usr/lib64/liblttng-ust-cyg-profile.so* appname This works for me. -- Suchakra Quoting Shariyar syed.shari...@gmail.com: Hi, I am trying to collect function entry and exit points in a trace. I have followed the instructions written on the following man page: http://manpages.ubuntu.com/manpages/trusty/man3/lttng-ust-cyg-profile.3.html . In my system, UST tracepoint tracing is working fine and I am able to collect traces with the statically typed tracepoints in the code. However, there is no liblttng-ust-cyg-profile.so in my system and I get an error when I execute the following: *LD_PRELOAD=liblttng-ust-cyg-profile.so* appname Please let me know how to get it to work? Thanks, Shariyar ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
Re: [lttng-dev] What are sys calls starting with compat?
What does sys_unknown mean and why doe it occur? Does it mean that LTTng can not find the name of system call? Regards, Shariyar -- Message: 2 Date: Tue, 10 Dec 2013 15:31:19 + (UTC) From: Mathieu Desnoyers mathieu.desnoy...@efficios.com To: Daniel Thibault daniel.thiba...@drdc-rddc.gc.ca Cc: lttng-dev@lists.lttng.org Subject: Re: [lttng-dev] What are sys calls starting with compat? Message-ID: 1571110803.82672.1386689479225.javamail.zim...@efficios.com Content-Type: text/plain; charset=utf-8 - Original Message - From: Daniel Thibault daniel.thiba...@drdc-rddc.gc.ca To: lttng-dev@lists.lttng.org Cc: Mathieu Desnoyers mathieu.desnoy...@efficios.com Sent: Tuesday, December 10, 2013 9:57:21 AM Subject: Re: [lttng-dev] What are sys calls starting with compat? Date: Tue, 10 Dec 2013 01:55:48 + (UTC) System calls with compat prefix are for e.g. 32-bit processes running on a 64-bit kernel: those processes are using a different system call table (ia32 for Intel) than 64-bit processes, and therefore those system calls are named compat_* by LTTng. Mathieu I presume the LTTng event names will also be prefixed with compat_. Yes. For instance, compat_sys_rmdir. Yes. Or would it be sys_compat_rmdir? No. And what of the exit_syscall and sys_unknown events? exit_syscall has no compat prefix as I recall. compat_sys_unknown. Thanks, Mathieu ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
[lttng-dev] What are sys calls starting with compat?
Can someone kindly explain the difference between system calls starting with compat prefix and regular system calls? Compat system calls do not appear in the system call table: http://syscalls.kernelgrok.com/. However, I did found them in the source code of Linux. Thanks, Shariyar ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
Re: [lttng-dev] Extracting System Call IDs By Using TMF
Hi Matthew: In that case I need to create a map myself. I was looking for the system call ids for the following reasons: 1. In LTTng 1.0, there were several occasions when only the system call id was found in a trace but not the names. If such is the case with LTTng 2.0, then my concern is that it would be better to extract ids. 2. Trained models need to be stored in database and ids will take lesser sapce as the model grows with time. Regards, Shariyar Message: 1 Date: Fri, 29 Nov 2013 10:39:54 -0500 From: Matthew Khouzam matthew.khou...@ericsson.com To: lttng-dev@lists.lttng.org Subject: Re: [lttng-dev] Extracting System Call IDs By Using TMF Message-ID: 5298b54a.5080...@ericsson.com Content-Type: text/plain; charset=ISO-8859-1 Hi Shariyar, I would like to know what is the need for the syscall id? I looked at kernel events, and they store the system call name, not the id? Is it for performance reasons, or is there some functionality that can be achieved from a call ID that cannot from a name? ___ lttng-dev mailing list lttng-dev@lists.lttng.org http://lists.lttng.org/cgi-bin/mailman/listinfo/lttng-dev
[lttng-dev] Extracting System Call IDs By Using TMF
Hi,
I need information on how to extract system call ids from a kernel level
trace by using TMF.
For example, a sample code to iterate through a kernel trace in CTF format
is given below.
In this code, I am able to extract the system call name and its return
value. However, from the *event.getContent()* function, I could not get the
system call id for the corresponding system call name.
Kindly let me know, how to extract the system call id? By system call id I
mean the actual system call id assigned by Linux to a system call as shown
on this site: http://syscalls.kernelgrok.com/
///Code
//
public void readTrace(){
CtfIterator traceIterator=trace.createIterator();
while (traceIterator.advance()){
CtfTmfEvent event = traceIterator.getCurrentEvent();
ITmfEventField content = event.getContent();
String eventName=event.getEventName();
ITmfEventField sys_exit=content.getField(ret);
if (sys_exit != null)
System.out.println(Ret: +sys_exit.getValue());
if (eventName.startsWith(LttngStrings.SYSCALL_PREFIX)
||
eventName.startsWith(LttngStrings.COMPAT_SYSCALL_PREFIX)) {
System.out.println(eventName);
}
}
}
///Code
//
Regards,
Shariyar
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