From: Oleg Nesterov <oleg@redhat.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Ingo Molnar <mingo@redhat.com>,
Masami Hiramatsu <mhiramat@redhat.com>,
Seiji Aguchi <saguchi@redhat.com>,
linux-kernel@vger.kernel.org,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Subject: Re: [GIT PULL] tracing: make signal tracepoints more useful
Date: Tue, 17 Jan 2012 15:04:08 +0100 [thread overview]
Message-ID: <20120117140408.GA10197@redhat.com> (raw)
In-Reply-To: <20120117124023.GA13969@elte.hu>
On 01/17, Ingo Molnar wrote:
>
> Any tool that requests the signal trace event, and copies the
> full (and now larger) record it got in the ring-buffer, without
> expanding the target record's size accordingly will *BREAK*.
>
> I do not claim that tools will break in practice - i'm raising
> the *possibility* out of caution and i'm frustrated that you
> *STILL* don't understand how ABIs are maintained in Linux.
OK, but what if we rename the tracepoint?
IOW, add the new tracepoint and remove the old one. Of course,
this can confuse the users of the current "signal_generate", but
this is safe. b413d48a does this...
Or this is not allowed too?
Oleg.
next prev parent reply other threads:[~2012-01-17 14:10 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-10 17:45 [PATCH 0/2] tracing: make signal tracepoints more useful Oleg Nesterov
2012-01-10 17:45 ` [PATCH 1/2] tracing: let trace_signal_generate() report more info, kill overflow_fail/lose_info Oleg Nesterov
2012-01-10 17:45 ` [PATCH 2/2] tracing: send_sigqueue() needs trace_signal_generate() too Oleg Nesterov
2012-01-10 18:59 ` [PATCH 0/2] tracing: make signal tracepoints more useful Steven Rostedt
2012-01-10 21:09 ` Seiji Aguchi
2012-01-13 18:20 ` [GIT PULL] " Oleg Nesterov
2012-01-15 18:24 ` Oleg Nesterov
2012-01-16 7:45 ` Ingo Molnar
2012-01-16 12:31 ` Steven Rostedt
2012-01-16 12:53 ` Ingo Molnar
2012-01-16 15:10 ` Oleg Nesterov
2012-01-17 18:50 ` Linus Torvalds
2012-01-18 9:39 ` Ingo Molnar
2012-01-16 15:52 ` Steven Rostedt
2012-01-17 10:02 ` Ingo Molnar
2012-01-17 12:03 ` Steven Rostedt
2012-01-17 12:40 ` Ingo Molnar
2012-01-17 14:04 ` Oleg Nesterov [this message]
2012-01-18 11:59 ` Ingo Molnar
2012-01-17 14:37 ` Steven Rostedt
2012-01-17 14:55 ` Oleg Nesterov
2012-01-20 18:01 ` Jason Baron
2012-01-17 19:52 ` Steven Rostedt
2012-01-16 15:03 ` Oleg Nesterov
2012-01-16 15:42 ` Seiji Aguchi
2012-01-16 15:58 ` Steven Rostedt
2012-01-26 10:10 ` Ingo Molnar
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