From: Daniel Jacobowitz <dan@debian.org>
To: Renzo Davoli <renzo@cs.unibo.it>
Cc: Jeff Dike <jdike@addtoit.com>,
Alan Cox <alan@lxorguk.ukuu.org.uk>, Andi Kleen <ak@suse.de>,
Ulrich Drepper <drepper@gmail.com>,
osd@cs.unibo.it, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] 2-ptrace_multi
Date: Mon, 22 May 2006 11:26:08 -0400 [thread overview]
Message-ID: <20060522152608.GA21869@nevyn.them.org> (raw)
In-Reply-To: <20060522150544.GB11910@cs.unibo.it>
On Mon, May 22, 2006 at 05:05:44PM +0200, Renzo Davoli wrote:
> Then it would be inconsistent with ppc64 where it does exist, and ppc64
> has the very same problem.
> So the solution would be to patch also the ppc64 [GS]ETREGS breaking
> compatibility with existing applications.
Or use new ptrace operations for the full regsets; that is probably
wiser.
> The MULTI proposal was a way to have a fast, simple, safe support.
> Fast: one syscall does all
You've added copy_from_user to several operations which were previously
entirely register-based calling conventions. In at least some
configurations this will dwarf the cost of the system call trap.
> If you do not find this proposal interesting, I'll continue to support
> it as a specific patch for umview. I am not here to "sell" any solution.
> On the contrary I think it might be useful in many applications.
Well, I'm afraid that I don't find it interesting; and I don't think
GDB would make use of it.
--
Daniel Jacobowitz
CodeSourcery
next prev parent reply other threads:[~2006-05-22 15:26 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-05-18 15:53 ptrace enhancements for VM support (patch proposals follow in sep.msgs) Renzo Davoli
2006-05-18 15:56 ` [PATCH] 1-access_process_vm_user Renzo Davoli
2006-05-18 15:58 ` [PATCH] 2-ptrace_multi Renzo Davoli
2006-05-18 20:17 ` Andi Kleen
2006-05-18 21:13 ` Renzo Davoli
2006-05-19 2:23 ` Ulrich Drepper
2006-05-19 9:07 ` Renzo Davoli
2006-05-19 13:09 ` Daniel Jacobowitz
2006-05-19 17:45 ` Renzo Davoli
2006-05-19 19:15 ` Renzo Davoli
2006-05-19 20:15 ` Daniel Jacobowitz
2006-05-19 20:17 ` Andi Kleen
2006-05-20 6:44 ` Ulrich Drepper
2006-05-20 14:37 ` Alan Cox
2006-05-20 18:30 ` Renzo Davoli
2006-05-20 20:23 ` Ulrich Drepper
2006-05-20 21:39 ` Jeff Dike
2006-05-21 12:38 ` Avi Kivity
2006-05-21 15:28 ` Renzo Davoli
2006-05-22 13:02 ` Daniel Jacobowitz
2006-05-22 15:05 ` Renzo Davoli
2006-05-22 15:26 ` Daniel Jacobowitz [this message]
2006-05-18 16:07 ` [PATCH] 3-ptrace_vm Renzo Davoli
2006-05-21 8:03 ` ptrace enhancements for VM support (patch proposals follow in sep.msgs) Peter Chubb
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