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From: Oleg Nesterov <oleg@redhat.com>
To: Denys Vlasenko <vda.linux@googlemail.com>
Cc: Tejun Heo <tj@kernel.org>, Roland McGrath <roland@redhat.com>,
	jan.kratochvil@redhat.com, linux-kernel@vger.kernel.org,
	torvalds@linux-foundation.org, akpm@linux-foundation.org
Subject: Re: [RFC] Proposal for ptrace improvements
Date: Fri, 4 Mar 2011 17:30:29 +0100	[thread overview]
Message-ID: <20110304163029.GB24871@redhat.com> (raw)
In-Reply-To: <20110304161321.GB23553@redhat.com>

On 03/04, Oleg Nesterov wrote:
>
> On 03/04, Denys Vlasenko wrote:
> >
> > # time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null'
> > exit_group(0)                           = ?
> > real	0m47.695s
> > user	0m3.965s
> > sys	0m29.047s
> >
> > strace with PTRACE_GETSIGINFO:
> >
> > # time sh -c './strace -e trace=exit_group ls -lR /usr/share >/dev/null'
> > exit_group(0)                           = ?
> > real	0m51.958s
> > user	0m3.899s
> > sys	0m31.584s
>
> I am wondering how much ptrace_check_attach()->wait_task_inactive()
> contributes... it can sleep.
>
> And note that many ptrace requests do not really need this,
> PTRACE_GETSIGINFO in particular.

could you replace the extra PTRACE_GETSIGINFO by invalid request?

Oleg.


  reply	other threads:[~2011-03-04 16:39 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-01 15:24 [RFC] Proposal for ptrace improvements Tejun Heo
2011-03-01 16:57 ` Denys Vlasenko
2011-03-01 17:09   ` Tejun Heo
2011-03-01 17:12     ` Tejun Heo
2011-03-01 17:21     ` Denys Vlasenko
2011-03-01 18:34       ` Tejun Heo
2011-03-01 23:51         ` Denys Vlasenko
2011-03-02  7:10           ` Tejun Heo
2011-03-02  5:07         ` Indan Zupancic
2011-03-02  7:44           ` Tejun Heo
2011-03-02 11:32             ` Indan Zupancic
2011-03-02 11:52               ` Denys Vlasenko
2011-03-02 14:50               ` Tejun Heo
2011-03-02 13:32             ` Oleg Nesterov
2011-03-03  0:47               ` Indan Zupancic
2011-03-03  1:30                 ` Denys Vlasenko
2011-03-03  1:55                   ` Indan Zupancic
2011-03-03  7:03                     ` Tejun Heo
2011-03-01 19:06 ` Jan Kratochvil
2011-03-01 22:14   ` Denys Vlasenko
2011-03-02  7:28     ` Tejun Heo
2011-03-02 10:58       ` Denys Vlasenko
2011-03-04 16:14     ` Jan Kratochvil
2011-03-04 16:41       ` Denys Vlasenko
2011-03-04 17:07       ` Oleg Nesterov
2011-03-04 18:12         ` Jan Kratochvil
2011-03-05  8:47           ` Tejun Heo
2011-03-01 22:59 ` Denys Vlasenko
2011-03-02  7:32   ` Tejun Heo
2011-03-02 11:02     ` Denys Vlasenko
2011-03-02 11:23       ` Tejun Heo
2011-03-03 19:26         ` Oleg Nesterov
2011-03-01 23:16 ` Denys Vlasenko
2011-03-02  7:37   ` Tejun Heo
2011-03-02 11:21     ` Denys Vlasenko
2011-03-02 11:27       ` Tejun Heo
2011-03-02 11:48         ` Denys Vlasenko
2011-03-02 14:43           ` Tejun Heo
2011-03-02 15:16             ` Denys Vlasenko
2011-03-02 15:25               ` Tejun Heo
2011-03-03 17:34 ` Oleg Nesterov
2011-03-03 20:22   ` Oleg Nesterov
2011-03-04  8:23     ` Tejun Heo
2011-03-04 18:16       ` Oleg Nesterov
2011-03-05  8:33         ` Tejun Heo
2011-03-04 13:01     ` Denys Vlasenko
2011-03-04 13:41       ` Tejun Heo
2011-03-04 13:59         ` Denys Vlasenko
2011-03-04 14:07           ` Tejun Heo
2011-03-04 14:31             ` Denys Vlasenko
2011-03-04 14:40               ` Tejun Heo
2011-03-04 17:05                 ` Denys Vlasenko
2011-03-04 17:12                   ` Linus Torvalds
2011-03-04 18:59                     ` Denys Vlasenko
2011-03-04 19:24                       ` Linus Torvalds
2011-03-04 16:13               ` Oleg Nesterov
2011-03-04 16:30                 ` Oleg Nesterov [this message]
2011-03-04  8:44   ` Tejun Heo
2011-03-04 16:01     ` Oleg Nesterov
2011-03-04 16:15       ` Tejun Heo
2011-03-04 16:26         ` Oleg Nesterov
2011-03-07 15:08 ` PTRACE_SEIZE/INTERRUPT: " Oleg Nesterov
2011-03-09  9:41   ` Tejun Heo
2011-03-09 17:30     ` Oleg Nesterov
2011-03-07 20:43 ` Roland McGrath
2011-03-09 10:28   ` Tejun Heo
2011-03-10 18:33     ` Steven Rostedt
2011-03-11  8:13       ` Tejun Heo
2011-03-11  8:22       ` Ingo Molnar
2011-03-11  9:35         ` Srikar Dronamraju
2011-03-11  9:43           ` Ingo Molnar
2011-03-14  1:03     ` Frank Ch. Eigler
2011-03-10 15:55   ` Steven Rostedt

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