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Re: Discussion at Linux Foundation Japan Symposium
- From: "Frank Ch. Eigler" <fche at redhat dot com>
- To: Theodore Tso <tytso at mit dot edu>
- Cc: Jason Baron <jbaron at redhat dot com>, Masami Hiramatsu <mhiramat at redhat dot com>, Roland McGrath <roland at redhat dot com>, systemtap at sources dot redhat dot com
- Date: Mon, 12 Jan 2009 15:31:28 -0500
- Subject: Re: Discussion at Linux Foundation Japan Symposium
- References: <20081221003831.GG24081@redhat.com> <20081222181921.GH23723@mit.edu> <20081222203747.GA4195@redhat.com> <20081223211306.67D29FC3B7@magilla.sf.frob.com> <20081223223217.GW23723@mit.edu> <49518856.80907@redhat.com> <20090110024810.GL23869@mit.edu> <20090112190401.GE3107@redhat.com> <20090112195159.GJ21793@mit.edu>
HI -
On Mon, Jan 12, 2009 at 02:51:59PM -0500, Theodore Tso wrote:
> [...]
> > We have been actively looking at and adding tracepoints to the lttng
> > kernel tree via the ltt-dev list to support Systemtap. [...]
> Huh? Last I checked Systemtap didn't support tracepoints at all. Did
> I miss something?
Not *directly*. Just like lttng, systemtap can currently use
tracepoints via a hand-written intermediary module that maps them to
markers.
> Also, the trace points won't necessarily be helpd up for merge until
> lttng is proposed for merge. [...]
>
> So what Linus Torvalds and other senior kernel developers proposed at
> the Kernel Summit was a simple debugfs/proc interface which would
> allow individual activation of a tracepoint/marker, and which would
> dump out the data collected by that marker as a simple text file
> accessed via a pseudo-filesystem.
Consider acking http://lkml.org/lkml/2008/12/30/297, a widget that
aims to connect generic markers to ftrace.
- FChE