From: "Frank Ch. Eigler" <fche@redhat.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
Kyle Moffett <kyle@moffetthome.net>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Peter Zijlstra <peterz@infradead.org>,
Fr??d??ric Weisbecker <fweisbec@gmail.com>,
Oleg Nesterov <oleg@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
LKML <linux-kernel@vger.kernel.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
linux-next@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
utrace-devel@redhat.com,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: linux-next: add utrace tree
Date: Sat, 23 Jan 2010 06:51:49 -0500 [thread overview]
Message-ID: <20100123115149.GB7828@redhat.com> (raw)
In-Reply-To: <20100123110121.1ce89bb9@lxorguk.ukuu.org.uk>
Hi -
On Sat, Jan 23, 2010 at 11:01:21AM +0000, Alan Cox wrote:
> [...]
> What I don't understand is why [libgdb?] doesn't solve 99% of your problem.
> ptrace is not perfect but most of the real ptrace limitations actually
> come about because either the CPU can't do something or because the
> supporting logic would be too expensive - things like having extra
> private debugger pages.
At least one reason is that ptrace is single-usage-only, so for
example you cannot concurrently debug & strace the same program.
OTOH, utrace is designed to permit clean nesting/sharing semantics for
concurrent debugger-type tools operating on the same processes.
- FChE
WARNING: multiple messages have this Message-ID (diff)
From: "Frank Ch. Eigler" <fche@redhat.com>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Kyle Moffett <kyle@moffetthome.net>,
Linus Torvalds <torvalds@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Peter Zijlstra <peterz@infradead.org>,
Fr??d??ric Weisbecker <fweisbec@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
linux-next@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
utrace-devel@redhat.com, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: linux-next: add utrace tree
Date: Sat, 23 Jan 2010 06:51:49 -0500 [thread overview]
Message-ID: <20100123115149.GB7828@redhat.com> (raw)
In-Reply-To: <20100123110121.1ce89bb9@lxorguk.ukuu.org.uk>
Hi -
On Sat, Jan 23, 2010 at 11:01:21AM +0000, Alan Cox wrote:
> [...]
> What I don't understand is why [libgdb?] doesn't solve 99% of your problem.
> ptrace is not perfect but most of the real ptrace limitations actually
> come about because either the CPU can't do something or because the
> supporting logic would be too expensive - things like having extra
> private debugger pages.
At least one reason is that ptrace is single-usage-only, so for
example you cannot concurrently debug & strace the same program.
OTOH, utrace is designed to permit clean nesting/sharing semantics for
concurrent debugger-type tools operating on the same processes.
- FChE
next prev parent reply other threads:[~2010-01-23 11:51 UTC|newest]
Thread overview: 158+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20100119211646.GF16096@redhat.com>
2010-01-20 0:12 ` linux-next: add utrace tree Stephen Rothwell
2010-01-20 5:49 ` Ingo Molnar
2010-01-20 6:15 ` Ananth N Mavinakayanahalli
2010-01-20 6:28 ` Ingo Molnar
2010-01-20 6:40 ` Ananth N Mavinakayanahalli
2010-01-20 10:43 ` Frederic Weisbecker
2010-01-20 6:59 ` Stephen Rothwell
2010-01-20 13:24 ` Frank Ch. Eigler
2010-01-20 13:24 ` Frank Ch. Eigler
2010-01-20 7:29 ` Ingo Molnar
2010-01-20 14:38 ` Stephen Rothwell
2010-01-21 1:22 ` Roland McGrath
2010-01-22 0:17 ` Stephen Rothwell
2010-01-22 0:30 ` Andrew Morton
2010-01-22 0:31 ` Andrew Morton
2010-01-22 0:31 ` Andrew Morton
2010-01-22 0:51 ` Frank Ch. Eigler
2010-01-22 0:51 ` Frank Ch. Eigler
2010-01-22 1:05 ` Andrew Morton
2010-01-22 1:25 ` Frank Ch. Eigler
2010-01-22 1:25 ` Frank Ch. Eigler
2010-01-22 1:32 ` Linus Torvalds
2010-01-22 2:22 ` Frank Ch. Eigler
2010-01-22 2:22 ` Frank Ch. Eigler
2010-01-22 2:35 ` Linus Torvalds
2010-01-22 20:51 ` Oleg Nesterov
2010-01-23 6:04 ` Ingo Molnar
2010-01-23 6:04 ` Ingo Molnar
2010-01-23 12:03 ` Frank Ch. Eigler
2010-01-24 16:36 ` Thomas Gleixner
2010-01-22 1:28 ` Linus Torvalds
2010-01-22 5:21 ` Ananth N Mavinakayanahalli
2010-01-22 13:43 ` Valdis.Kletnieks
2010-01-22 19:39 ` Oleg Nesterov
2010-01-22 19:39 ` Oleg Nesterov
2010-01-26 13:58 ` Pavel Machek
2010-01-22 18:28 ` Oleg Nesterov
2010-01-22 18:28 ` Oleg Nesterov
2010-01-22 20:01 ` Frank Ch. Eigler
2010-01-22 20:01 ` Frank Ch. Eigler
2010-01-22 20:16 ` Peter Zijlstra
2010-01-22 21:44 ` Frank Ch. Eigler
2010-01-22 21:44 ` Frank Ch. Eigler
2010-01-22 21:59 ` Linus Torvalds
2010-01-22 22:13 ` Frank Ch. Eigler
2010-01-23 0:11 ` Linus Torvalds
2010-01-23 0:22 ` Linus Torvalds
2010-01-23 0:22 ` Linus Torvalds
2010-01-23 6:20 ` Kyle Moffett
2010-01-23 11:01 ` Alan Cox
2010-01-23 11:51 ` Frank Ch. Eigler [this message]
2010-01-23 11:51 ` Frank Ch. Eigler
2010-01-23 15:57 ` Arnaldo Carvalho de Melo
2010-01-23 11:23 ` Ingo Molnar
2010-01-23 11:47 ` Frank Ch. Eigler
2010-01-23 11:47 ` Frank Ch. Eigler
2010-01-23 19:48 ` tytso
2010-01-24 18:01 ` Frank Ch. Eigler
2010-01-24 18:01 ` Frank Ch. Eigler
2010-01-25 1:42 ` Kyle Moffett
2010-01-25 1:42 ` Kyle Moffett
2010-01-25 4:55 ` tytso
2010-01-25 16:52 ` Linus Torvalds
2010-01-25 16:52 ` Linus Torvalds
2010-01-25 17:02 ` Frank Ch. Eigler
2010-01-25 17:36 ` Linus Torvalds
2010-01-25 17:45 ` Linus Torvalds
2010-01-25 17:54 ` Steven Rostedt
2010-01-25 18:03 ` Alan Cox
2010-01-25 18:12 ` Linus Torvalds
2010-01-25 18:30 ` Steven Rostedt
2010-01-25 18:45 ` Thomas Gleixner
2010-01-25 20:34 ` Ingo Molnar
2010-01-25 20:30 ` Mark Wielaard
2010-01-25 20:30 ` Mark Wielaard
2010-01-25 20:42 ` Linus Torvalds
2010-01-26 0:02 ` Renzo Davoli
2010-01-26 0:02 ` Renzo Davoli
2010-01-26 0:07 ` Linus Torvalds
2010-01-26 16:08 ` Johannes Stezenbach
2010-01-26 16:28 ` Linus Torvalds
2010-01-26 16:34 ` Christoph Hellwig
2010-01-28 23:53 ` Benjamin Herrenschmidt
2010-01-29 0:21 ` Linus Torvalds
2010-01-25 4:59 ` Ananth N Mavinakayanahalli
2010-01-25 10:13 ` Peter Zijlstra
2010-01-24 5:04 ` Linus Torvalds
2010-01-24 10:25 ` tytso
2010-01-24 13:20 ` Frank Ch. Eigler
2010-01-24 13:20 ` Frank Ch. Eigler
2010-01-25 21:05 ` Tom Tromey
2010-01-25 21:05 ` Tom Tromey
2010-01-25 21:41 ` Linus Torvalds
2010-01-25 21:41 ` Linus Torvalds
2010-01-26 14:21 ` Ananth N Mavinakayanahalli
2010-01-26 23:20 ` Tom Tromey
2010-01-26 23:20 ` Tom Tromey
2010-01-26 23:37 ` Linus Torvalds
2010-01-27 6:52 ` Peter Zijlstra
2010-01-27 8:54 ` Ingo Molnar
2010-01-28 1:52 ` Jim Keniston
2010-01-28 8:55 ` Ingo Molnar
2010-01-29 0:59 ` Jim Keniston
2010-01-29 7:39 ` Ingo Molnar
2010-01-29 7:52 ` Ananth N Mavinakayanahalli
2010-01-29 7:55 ` Ananth N Mavinakayanahalli
2010-01-29 9:16 ` Ingo Molnar
2010-01-29 9:11 ` Ingo Molnar
2010-01-29 9:31 ` Ananth N Mavinakayanahalli
2010-01-29 9:51 ` Ingo Molnar
2010-01-29 18:13 ` Frank Ch. Eigler
2010-01-29 18:13 ` Frank Ch. Eigler
2010-01-29 4:55 ` Ananth N Mavinakayanahalli
2010-01-29 7:42 ` Ingo Molnar
2010-01-30 17:49 ` Steven Rostedt
2010-01-30 17:59 ` Linus Torvalds
2010-02-02 6:47 ` Masami Hiramatsu
2010-02-02 6:47 ` Masami Hiramatsu
2010-01-27 10:43 ` Linus Torvalds
2010-01-27 10:55 ` Peter Zijlstra
2010-01-27 10:58 ` Peter Zijlstra
2010-01-27 11:04 ` Linus Torvalds
2010-01-27 16:01 ` Frederic Weisbecker
2010-01-27 11:05 ` Ananth N Mavinakayanahalli
2010-01-27 11:08 ` Peter Zijlstra
2010-01-27 11:20 ` Ananth N Mavinakayanahalli
2010-02-08 10:09 ` Avi Kivity
2010-02-08 10:09 ` Avi Kivity
2010-01-27 11:07 ` Srikar Dronamraju
2010-01-27 11:07 ` Srikar Dronamraju
2010-01-27 13:59 ` Steven Rostedt
2010-01-27 17:42 ` H. Peter Anvin
2010-01-27 17:42 ` H. Peter Anvin
2010-01-27 18:53 ` Steven Rostedt
2010-02-08 6:54 ` Pavel Machek
2010-02-08 9:30 ` H. Peter Anvin
2010-02-08 9:53 ` Arjan van de Ven
2010-02-08 9:53 ` Arjan van de Ven
2010-01-27 19:18 ` H. Peter Anvin
2010-01-27 19:18 ` H. Peter Anvin
2010-01-27 0:38 ` Frank Ch. Eigler
2010-01-27 0:38 ` Frank Ch. Eigler
2010-01-26 15:00 ` Frank Ch. Eigler
2010-01-26 17:33 ` Andi Kleen
2010-01-26 18:46 ` Linus Torvalds
2010-01-26 21:02 ` Andi Kleen
2010-01-26 21:53 ` Oleg Nesterov
2010-01-26 22:03 ` Andi Kleen
2010-01-26 23:32 ` Oleg Nesterov
2010-01-26 23:32 ` Oleg Nesterov
2010-01-26 21:30 ` Oleg Nesterov
2010-01-26 21:30 ` Oleg Nesterov
2010-01-26 23:27 ` Tom Tromey
2010-01-26 23:27 ` Tom Tromey
2010-01-23 8:05 ` Alexey Dobriyan
2010-01-22 17:45 ` Oleg Nesterov
2010-01-20 8:52 ` Peter Zijlstra
2010-01-20 13:01 ` Frank Ch. Eigler
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=20100123115149.GB7828@redhat.com \
--to=fche@redhat.com \
--cc=a.p.zijlstra@chello.nl \
--cc=acme@redhat.com \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=fweisbec@gmail.com \
--cc=hpa@zytor.com \
--cc=kyle@moffetthome.net \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-next@vger.kernel.org \
--cc=oleg@redhat.com \
--cc=peterz@infradead.org \
--cc=rostedt@goodmis.org \
--cc=sfr@canb.auug.org.au \
--cc=tglx@linutronix.de \
--cc=torvalds@linux-foundation.org \
--cc=utrace-devel@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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.