From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <systemtap-return-21920-listarch-systemtap=sources.redhat.com@sourceware.org>
Received: (qmail 11673 invoked by alias); 10 Jan 2014 21:30:03 -0000
Mailing-List: contact systemtap-help@sourceware.org; run by ezmlm
Precedence: bulk
List-Id: <systemtap.sourceware.org>
List-Subscribe: <mailto:systemtap-subscribe@sourceware.org>
List-Post: <mailto:systemtap@sourceware.org>
List-Help: <mailto:systemtap-help@sourceware.org>, <http://sourceware.org/lists.html#faqs>
Sender: systemtap-owner@sourceware.org
Received: (qmail 11630 invoked by uid 89); 10 Jan 2014 21:30:01 -0000
Authentication-Results: sourceware.org; auth=none
X-Virus-Found: No
X-Spam-SWARE-Status: No, score=-1.8 required=5.0 tests=AWL,BAYES_00,RP_MATCHES_RCVD,SPF_HELO_PASS,SPF_PASS autolearn=ham version=3.3.2
X-HELO: mx4-phx2.redhat.com
Received: from mx4-phx2.redhat.com (HELO mx4-phx2.redhat.com) (209.132.183.25) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Fri, 10 Jan 2014 21:29:59 +0000
Received: from zmail11.collab.prod.int.phx2.redhat.com (zmail11.collab.prod.int.phx2.redhat.com [10.5.83.13])	by mx4-phx2.redhat.com (8.13.8/8.13.8) with ESMTP id s0ALTwkp020972	for <systemtap@sourceware.org>; Fri, 10 Jan 2014 16:29:58 -0500
Date: Fri, 10 Jan 2014 21:30:00 -0000
From: Jonathan Lebon <jlebon@redhat.com>
To: systemtap@sourceware.org
Message-ID: <1598992413.6664177.1389389398354.JavaMail.root@redhat.com>
In-Reply-To: <1769953313.6141568.1389303043384.JavaMail.root@redhat.com>
References: <1769953313.6141568.1389303043384.JavaMail.root@redhat.com>
Subject: Re: SystemTap upcoming feature: boot-time probing
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
X-IsSubscribed: yes
X-SW-Source: 2014-q1/txt/msg00018.txt.bz2

> procmod_watcher.stp
> ===================

Here's a nicer version which also doesn't require debuginfo nor guru-mode for exec() args:

procmod_watcher.stp
===================
function print_time() {
   timer = read_stopwatch_us("timer")
   printf("%4d.%.6d: ", timer/1000000, timer%1000000)
}

probe begin {
   start_stopwatch("timer")
   printf("   0.000000: Started module_watcher on %s\n",
          ctime(gettimeofday_s()))
}

probe nd_syscall.execve {
   print_time()
   printf("EXEC: (%4d) %s: file %s\n",
          pid(), execname(), argstr)
}

probe nd_syscall.fork.return {
   print_time()
   printf("FORK: (%4d) %s: pid %s\n",
          pid(), execname(), retstr)
}

probe nd_syscall.exit {
   print_time()
   sig = status & 0x7F
   code = sig ? sig : status >> 8
   printf("EXIT: (%4d) %s: %s %d\n",
          pid(), execname(),
          sig ? "signal" : "exit code", code)
}

probe kernel.trace("module_load") {
   print_time()
   printf("LOAD: (%4d) %s: module %s",
          pid(), execname(),
          kernel_string(@cast($mod, "struct module", "kernel<linux/module.h>")->name))
   args = kernel_string(@cast($mod, "struct module", "kernel<linux/module.h>")->args)
   if (args != "")
      printf(" with args \"%s\"", args)
   println("")
}

probe nd_syscall.delete_module {
   print_time()
   printf("UNLD: (%4d) %s: module %s with flags 0x%x\n",
          pid(), execname(), name_user, flags);
}

probe end {
   print_time()
   printf("Exiting module_watcher on %s\n",
          ctime(gettimeofday_s()))
}