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To: "Stone, Joshua I" <joshua.i.stone@intel.com>
Cc: <david_list@boreham.org>, "SystemTap" <systemtap@sources.redhat.com>
Subject: Re: user mode backtrace
References: <C56DB814FAA30B418C75310AC4BB279DCC3D8B@scsmsx413.amr.corp.intel.com>
From: fche@redhat.com (Frank Ch. Eigler)
Date: Fri, 20 Oct 2006 00:09:00 -0000
In-Reply-To: <C56DB814FAA30B418C75310AC4BB279DCC3D8B@scsmsx413.amr.corp.intel.com>
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"Stone, Joshua I" <joshua.i.stone@intel.com> writes:

> [...]  Deadlock issues aside, there's not really a way for you to
> invoke a process (like pstack) from within a SystemTap script.  [...]

It turns out that quite some time ago, Martin implemented a clone of
the dtrace system() function for systemtap, which enqueues a string
for execution by the userspace staprun daemon.  (There is no
synchronization or data exchange though.)

- FChE