Re: [linuxtools-dev] Q: control flow view

[Bernd Hufmann <bhufmann@xxxxxxxxx>]

Hi

The Bug332905 was created for this reported problem. I've posted some 
investigation results. Please refer to this bug for more details.
https://bugs.eclipse.org/bugs/show_bug.cgi?id=332905

Thanks
Bernd

On Thu, Dec 16, 2010 at 6:36 PM, Tony Jones <tonyj@xxxxxxx> wrote:

Hi.

I'm having some issues with the control flow view.

2.6.36 lttng enabled kernel, svn r27050 of the plugin.

I ran the following steps in single user with maxcpus=1

cc -o open-write open-write.c
lttctl -C -p <path> traceK
./open-write foo
lttctl -D traceK

This generated what seems to be a good trace.

lttv -m textDump -t <path> | grep "syscall_.*open-write" shows all the expected
syscalls.

My issue is that the eclipse plugin doesn't show what I expected it would.
Selecting the task in the control view and iterating the events with NextEv,
all I see is:

kernel/0/process_fork
kernel/0/sched_schedule
kernel/0/syscall_entry
[then nothing]

If I adjust the trace to 206.000 I can see two gantt entries for open-write,
one WAIT and another for SYSCALL but the later states that the stop time is
undefined which is consistent with it failing to see a syscall_exit event.

Trace is at:  http://ftp.suse.com/pub/people/tonyj/temp/trace.tar.bz2

Tony

---- open-write.c ----
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{
       int fd, cnt;
       pid_t pid=getpid();

       char *s="this is a sample string!";
       char buf[512];

       if (argc != 2) {
               fprintf(stderr, "usage: %s filename\n", argv[0]);
               return 1;
       }

       fd = open(argv[1], O_RDWR|O_CREAT, 0600);

       if (fd == -1) {
               perror("open");
               return 1;
       }

       if (write(fd, s, strlen(s)) != strlen(s)) {
               perror("write");
               return 1;
       }

       lseek(fd, SEEK_SET, 0);

       cnt=read(fd, buf, sizeof(buf));
       buf[cnt] = 0;


       printf("%u: %s\n", pid, buf);

       close(fd);
}
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