From: fche@redhat.com (Frank Ch. Eigler)
To: mglt.biz@gmail.com
Cc: systemtap@sourceware.org
Subject: Re: Monitoring Modules
Date: Thu, 19 May 2011 17:54:00 -0000 [thread overview]
Message-ID: <y0m7h9mzidd.fsf@fche.csb> (raw)
In-Reply-To: <4DD552F6.8010803@gmail.com> (Daniel Migault's message of "Thu, 19 May 2011 19:27:18 +0200")
Hi, Daniel -
> To measure how IPsec influences the performances of our system, we
> would like to record the module of the current task. We use the
> probemod() function but it only returns " <unknown> ".
> Do you know how could we get the module's name performing the task?
> [probe timer.profile ... ]
> if (!user_mode()) {
> module=probemod()
> kticks[e,tid] <<< 1
probemod(), like probefunc(), work by parsing probe point strings,
which is not that helpful - as you've discovered. Sorry about that.
The symdata() function gives you module names for an arbitrary PC
address, but also gives you extra stuff (symbol + offset) that you'd
have to parse away with tokenize() or somesuch.
To get the PC address at the timer.profile interrupt site, stap 1.5
will have this tapset function added; you can transcribe it into your
script for the moment:
function addr:long ()
%{ /* pure */
THIS->__retvalue = (intptr_t)(CONTEXT->regs ? REG_IP(CONTEXT->regs) : 0);
%}
- FChE
next prev parent reply other threads:[~2011-05-19 17:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-19 17:27 Daniel Migault
2011-05-19 17:54 ` Frank Ch. Eigler [this message]
2011-06-01 7:04 ` Daniel Migault
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