From: Peter Zijlstra <peterz@infradead.org>
To: Dmitry Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Will Deacon <will@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Matt Morehouse <mascasa@google.com>
Subject: Re: Process-wide watchpoints
Date: Thu, 4 Feb 2021 14:10:36 +0100 [thread overview]
Message-ID: <YBvyTDR+q0M62vKR@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <CACT4Y+a17L2pUY1kkRB_v_y3P_sbMpSLb6rVfXmGM7LkbAvj5Q@mail.gmail.com>
On Thu, Feb 04, 2021 at 01:53:59PM +0100, Dmitry Vyukov wrote:
> Humm... I was thinking of perf_event_open(pid == 0).
> It does not make sense to send SIGTRAP in a remote process, because it
> does not necessarily cooperate with us.
>
> But is there any problem with clone w/o CLONE_THREAD? Assuming the
> current process has setup the signal handler, the child will have the
> same handler and the same code/address space. So delivery of SIGTRAP
> should work the same way in the child.
Nothing should be doing CLONE_VM without CLONE_THREAD. Yes, it's
possible, but if you do so, you get to keep the pieces IMO.
Current libc either does a full clone (fork) or pthread_create,
pthread_create does CLONE_THREAD.
next prev parent reply other threads:[~2021-02-04 13:11 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-12 7:46 Process-wide watchpoints Dmitry Vyukov
2020-11-12 10:31 ` Peter Zijlstra
2020-11-12 10:43 ` Dmitry Vyukov
[not found] ` <CACT4Y+bW1gpv8bz0vswaVUt-OB07oJ3NBeTi+vchAe8TTWK+mg@mail.gmail.com>
[not found] ` <CACT4Y+ZsKXfAxrzJGQc5mJ+QiP5sAw7zKWtciS+07qZzSf33mw@mail.gmail.com>
2021-02-01 8:50 ` Dmitry Vyukov
2021-02-03 12:29 ` Peter Zijlstra
2021-02-03 12:49 ` Dmitry Vyukov
2021-02-03 12:50 ` Dmitry Vyukov
2021-02-03 13:37 ` Peter Zijlstra
2021-02-04 8:10 ` Dmitry Vyukov
2021-02-04 9:38 ` Peter Zijlstra
2021-02-04 9:54 ` Dmitry Vyukov
2021-02-04 12:09 ` Peter Zijlstra
2021-02-04 12:53 ` Dmitry Vyukov
2021-02-04 13:10 ` Peter Zijlstra [this message]
2021-02-04 13:35 ` Dmitry Vyukov
2021-02-04 13:45 ` Peter Zijlstra
2021-02-04 14:59 ` Peter Zijlstra
2021-02-04 13:33 ` Peter Zijlstra
2021-02-04 13:37 ` Dmitry Vyukov
2021-02-04 13:06 ` Peter Zijlstra
2021-02-03 5:38 ` Namhyung Kim
2021-02-04 8:10 ` Dmitry Vyukov
2021-02-03 12:22 ` Peter Zijlstra
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