From: "Frank Ch. Eigler" <fche@redhat.com>
To: "Török Edwin" <edwintorok@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
fweisbec@gmail.com, mingo@elte.hu, srostedt@redhat.com,
sandmann@daimi.au.dk, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/4] Add support for userspace stacktraces in tracing/iter_ctrl
Date: Sun, 26 Oct 2008 09:49:05 -0400 [thread overview]
Message-ID: <20081026134904.GG8210@redhat.com> (raw)
In-Reply-To: <490472E5.2070207@gmail.com>
Hi -
On Sun, Oct 26, 2008 at 03:38:45PM +0200, Török Edwin wrote:
> [...] In userspace I can get a stacktrace using DWARF unwind info,
> but doing that in the kernel would be too expensive, right? [...]
We're experimenting with just that in systemtap. The expenses
(memory: megabytes of unwind data, time: running code to process it)
would be paid only for the duration of a systemtap script that needs
that particular sort of information.
- FChE
next prev parent reply other threads:[~2008-10-26 13:49 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-12 13:11 [PATCH 0/4] ftrace: add userspace stacktrace support and semaphore-latency tracer Török Edwin
2008-10-12 13:12 ` Török Edwin
2008-10-12 13:12 ` [PATCH 1/4] Add support for userspace stacktraces in tracing/iter_ctrl Török Edwin
2008-10-12 13:31 ` Frédéric Weisbecker
2008-10-12 13:53 ` Török Edwin
2008-10-13 8:02 ` Frédéric Weisbecker
2008-10-26 4:05 ` Frédéric Weisbecker
2008-10-26 7:03 ` Török Edwin
2008-10-26 15:06 ` Frédéric Weisbecker
2008-10-26 13:15 ` Frank Ch. Eigler
2008-10-26 13:29 ` Peter Zijlstra
2008-10-26 13:38 ` Török Edwin
2008-10-26 13:49 ` Frank Ch. Eigler [this message]
2008-10-27 16:03 ` Ingo Molnar
2008-10-27 16:16 ` Török Edwin
2008-10-12 13:12 ` [PATCH 2/4] Identify which executable object the userspace address belongs to Török Edwin
2008-10-12 13:12 ` [PATCH 3/4] add tracepoints in rwsem Török Edwin
2008-10-12 13:12 ` [PATCH 4/4] Implement semaphore latency tracer Török Edwin
2008-10-12 19:13 ` Peter Zijlstra
2008-10-12 20:10 ` Török Edwin
2008-10-22 15:28 ` Ingo Molnar
2008-10-22 15:41 ` Török Edwin
2008-10-22 15:48 ` Ingo Molnar
2008-10-22 17:22 ` Peter Zijlstra
2008-10-22 17:25 ` Török Edwin
2008-10-12 18:25 ` [PATCH 0/4] ftrace: add userspace stacktrace support and semaphore-latency tracer Steven Rostedt
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