From: Cyrill Gorcunov <gorcunov@openvz.org>
To: Pedro Alves <palves@redhat.com>
Cc: Oleg Nesterov <oleg@redhat.com>,
Pavel Emelyanov <xemul@parallels.com>,
Jan Kratochvil <jan.kratochvil@redhat.com>,
Tejun Heo <tj@kernel.org>, Andrew Vagin <avagin@openvz.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] ptrace: add ability to get clear_tid_address
Date: Wed, 8 Feb 2012 00:56:39 +0400 [thread overview]
Message-ID: <20120207205639.GJ27437@moon> (raw)
In-Reply-To: <4F31848A.9070406@redhat.com>
On Tue, Feb 07, 2012 at 08:07:38PM +0000, Pedro Alves wrote:
> On 02/03/2012 04:51 PM, Oleg Nesterov wrote:
> > On 02/03, Pavel Emelyanov wrote:
>
> >> Because there's no need for current to get this value of himself, but can
> >> be useful for e.g. gdb.
> >
> > OK, perhaps this makes sense, I do not know.
> >
> > Jan, Pedro, do you think gdb can use PTRACE_GET_TID_ADDRESS (returns
> > tracee->clear_child_tid) ?
>
> Off hand, I'm not picturing a use. But that may well just mean I'm lacking
> imagination. Andrew, Pavel, did you have a particular idea in mind when you
> said it may be useful for debugging a multithreading program / gdb?
>
Might not we set up hw watchpoint on this address and get interrupt
before pthread-join will find it? (To be fair I'm not sure if such
trick will work, didn't test ;)
Cyrill
next prev parent reply other threads:[~2012-02-07 20:56 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-03 11:11 [PATCH] ptrace: add ability to get clear_tid_address Andrew Vagin
2012-02-03 16:25 ` Tejun Heo
2012-02-03 16:30 ` Cyrill Gorcunov
2012-02-03 16:41 ` Oleg Nesterov
2012-02-03 16:54 ` Cyrill Gorcunov
2012-02-03 16:45 ` Pavel Emelyanov
2012-02-03 16:51 ` Oleg Nesterov
2012-02-07 20:07 ` Pedro Alves
2012-02-07 20:56 ` Cyrill Gorcunov [this message]
2012-02-07 21:15 ` Pedro Alves
2012-02-07 21:51 ` Cyrill Gorcunov
2012-02-08 12:30 ` Pedro Alves
2012-02-08 12:42 ` Cyrill Gorcunov
2012-02-08 17:31 ` Oleg Nesterov
2012-02-08 18:04 ` Pedro Alves
2012-02-08 19:02 ` Oleg Nesterov
2012-02-08 19:20 ` Cyrill Gorcunov
2012-02-08 19:21 ` Jan Kratochvil
2012-02-08 19:42 ` Pedro Alves
2012-02-08 13:41 ` Andrew Vagin
2012-02-08 18:12 ` Jan Kratochvil
2012-02-10 3:02 ` Jamie Lokier
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