From: Tom Tromey <tromey@redhat.com>
To: Pedro Alves <pedro@codesourcery.com>
Cc: gdb-patches@sourceware.org, Sergio Durigan Junior <sergiodj@redhat.com>
Subject: Re: [PATCH 3/6] Modify internalvar mechanism
Date: Tue, 19 Apr 2011 20:01:00 -0000 [thread overview]
Message-ID: <m3fwpe3tas.fsf@fleche.redhat.com> (raw)
In-Reply-To: <m3oc423x1y.fsf@fleche.redhat.com> (Tom Tromey's message of "Tue, 19 Apr 2011 12:39:37 -0600")
Pedro> I noticed that patch 4 does some changes to
Pedro> start_tracing to tweak the probes' semaphores, if any.
Pedro> What are these semaphores? How do other stap tools
Pedro> handle them? I ask because that bends a bit the definition
Pedro> of "trace" being a regular tracepoint at a given
Pedro> location, so I'd like to understand it.
While developing this, Sergio and I talked extensively to Roland and the
other SystemTap guys about the sdt.h implementation. Today I finally
got around to writing up our notes:
http://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation
There is already some documentation about adding probes:
http://sourceware.org/systemtap/wiki/AddingUserSpaceProbingToApps
.. though it seems to focus a bit too much (IMO) on the dtrace
compatibility aspect. You can see a simpler approach in the test suite
part of patch #4 -- you don't actually need anything more than the
#include.
Tom
prev parent reply other threads:[~2011-04-19 20:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-04 3:08 Sergio Durigan Junior
2011-04-11 21:08 ` Jan Kratochvil
2011-04-12 11:24 ` Pedro Alves
2011-04-12 20:40 ` Tom Tromey
2011-04-12 22:33 ` Sergio Durigan Junior
2011-04-19 17:53 ` Pedro Alves
2011-04-19 18:40 ` Tom Tromey
2011-04-19 20:01 ` Tom Tromey [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=m3fwpe3tas.fsf@fleche.redhat.com \
--to=tromey@redhat.com \
--cc=gdb-patches@sourceware.org \
--cc=pedro@codesourcery.com \
--cc=sergiodj@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox