Top syscalls

[Hien Nguyen]

This script will list the top 20 system calls during the interval of 
2000 jiffies contineuosly. Run this script  with the latest systemtap 
from CVS. To run the script
stap -g topsys.stp

It takes a while for the system compiling the module, so be patient. The 
output would look like this

SYSCALL                                                 COUNT
sys_gettimeofday                                        191
sys_ioctl                                               67
sys_poll                                                67
sys_read                                                54
sys_select                                              50
sys_setitimer                                           43
sys_write                                               27
sys_sigreturn                                           21
sys_stat64                                              7
sys_lstat64                                             5
sys_rt_sigprocmask                                      4
sys_time                                                2
sys_rt_sigaction                                        1
sys_wait4                                               1
sys_exit_group                                          1
sys_exit                                                1
sys_waitpid                                             1
sys_fstat64                                             1
sys_writev                                              1
sys_open                                                1
----------------------------------------------------------------


Note: In order fro this script to run contineuosly I have to reset 
CONTEXT->actioncount every time I print the list, which breaks Frank's 
safety measure, otherwise I would get this error

ERROR: MAXACTION exceeded near identifier 'sys_cnt' at topsys.stp:33:3

I guess if you are running a script in guru mode such action is allowed.

Hien.
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