From: Masami Hiramatsu <mhiramat@redhat.com>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, lkml <linux-kernel@vger.kernel.org>,
Roland McGrath <roland@redhat.com>,
Jason Baron <jbaron@redhat.com>,
systemtap <systemtap@sources.redhat.com>,
DLE <dle-develop@lists.sourceforge.net>
Subject: Re: [PATCH -tip v3 0/3] tracepoint: Add signal events
Date: Tue, 24 Nov 2009 21:45:00 -0000 [thread overview]
Message-ID: <4B0C53ED.8060808@redhat.com> (raw)
In-Reply-To: <20091124212247.GA11773@redhat.com>
Oleg Nesterov wrote:
> On 11/23, Ingo Molnar wrote:
>>
>> * Masami Hiramatsu<mhiramat@redhat.com> wrote:
>>
>>> Hi,
>>>
>>> These patches add signal related tracepoints including
>>> signal generation, delivery, and loss. First patch also
>>> moves signal-sending tracepoint from events/sched.h to
>>> events/signal.h.
>>>
>>> Changes in v3
>>> - Add Docbook style comments
>>>
>>> Changes in v2
>>> - Add siginfo arguments
>>>
>>> Thank you,
>>>
>>> ---
>>>
>>> Masami Hiramatsu (3):
>>> tracepoint: Add signal loss events
>>> tracepoint: Add signal deliver event
>>> tracepoint: Move signal sending tracepoint to events/signal.h
>>>
>>>
>>> Documentation/DocBook/tracepoint.tmpl | 5 +
>>> include/trace/events/sched.h | 25 -----
>>> include/trace/events/signal.h | 173 +++++++++++++++++++++++++++++++++
>>> kernel/signal.c | 27 ++++-
>>> 4 files changed, 198 insertions(+), 32 deletions(-)
>>> create mode 100644 include/trace/events/signal.h
>>
>> Would be nice to have Roland's and Oleg's Acked-by tags in the patches -
>> to show that this is a representative and useful looking set of signal
>> events.
>
> Sorry, I can't really comment these patches.
>
> I mean, I do not know which info is useful and which is not.
> For example, I am a bit surprized we report trace_signal_lose_info()
> but please do not consider this as if I think we shouldn't. Just I
> do not know.
>
> OTOH, we do not report if __send_signal() fails just because the
> legacy signal is already queued. We do not report who sends the signal,
> we do not report if it was private or shared. zap_process, complete_signal
> can "send" SIGKILL via sigaddset, this won't be noticed. But again, it is
> not that I think this should be reported.
>
> In short: I think any info may be useful, and these patches can help.
> But I do not understand what exactly should be reported to userspace.
Yeah, any comments are welcome:-) IMHO, these tracepoints are just for
providing options for users who care about who sent the signal, etc.
Thank you,
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com
next prev parent reply other threads:[~2009-11-24 21:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-20 21:29 Masami Hiramatsu
2009-11-20 21:29 ` [PATCH -tip v3 2/3] tracepoint: Add signal deliver event Masami Hiramatsu
2009-11-20 21:29 ` [PATCH -tip v3 1/3] tracepoint: Move signal sending tracepoint to events/signal.h Masami Hiramatsu
2009-11-24 20:55 ` Oleg Nesterov
2009-11-24 21:00 ` Masami Hiramatsu
2009-11-20 21:30 ` [PATCH -tip v3 3/3] tracepoint: Add signal loss events Masami Hiramatsu
2009-11-23 17:59 ` [PATCH -tip v3 0/3] tracepoint: Add signal events Ingo Molnar
2009-11-24 21:28 ` Oleg Nesterov
2009-11-24 21:45 ` Masami Hiramatsu [this message]
2009-11-24 21:56 ` Ingo Molnar
2009-11-25 17:46 ` Oleg Nesterov
2009-11-23 23:01 ` Jason Baron
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