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From: "H. Peter Anvin" <hpa@zytor.com>
To: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David Sharp <dhsharp@google.com>,
	Vaibhav Nagarnaik <vnagarnaik@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Michael Rubin <mrubin@google.com>,
	x86@kernel.org,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Jiaying Zhang <jiayingz@google.com>
Subject: Re: [PATCH v2] trace: Add x86 irq vector entry/exit tracepoints
Date: Wed, 06 Jul 2011 17:30:18 -0700	[thread overview]
Message-ID: <4E14FE1A.9000003@zytor.com> (raw)
In-Reply-To: <20110707002512.GB21115@somewhere>

On 07/06/2011 05:25 PM, Frederic Weisbecker wrote:
> 
> I'm suggesting two things:
> 
> 1) If every arch implement a tracepoint for a generic event, then move the tracepoint
> to the generic code. I believe that part is not very controversial.
> 

Agreed -- as long as it doesn't mean breaking the flow for specific arches.

> 2) If every arch implement a common event that is not implemented in core code (I believe
> it was the case for reschedule_interrupt few times ago but changed lately) then try
> to have a common tracepoint for every archs if possible. So that we don't have
> thousand names for the same event, or different parameters name when those parameters and the
> event semantic are exactly the same amongst every architecture.

Agreed as well.

> Trace events are irresponsible anyway because they involve that "ABI not really stable but tools
> rely on it so...well...)". I'm not sure the above points make the situation worse though. Probably
> the cases that fit in 2) need to be carefully checked to ensure they really fit in 2).

Yes, it was much more of a generic concern.  However, it is very
important that people have a correct idea about what the stability of
something like tracepoint is -- or we'll end up in a situation where we
can never change the kernel because anything is suddenly "user space
visible."

	-hpa

  reply	other threads:[~2011-07-07  0:30 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-22 22:56 [PATCH] trace: Add special x86 irq entry/exit tracepoints Vaibhav Nagarnaik
2011-04-25 23:41 ` Vaibhav Nagarnaik
2011-04-28 23:16   ` Vaibhav Nagarnaik
2011-04-28 23:41   ` Steven Rostedt
2011-04-29 20:12   ` [PATCH] trace: Add x86 irq vector " Vaibhav Nagarnaik
2011-04-29 20:26     ` Thomas Gleixner
2011-04-29 22:04       ` Vaibhav Nagarnaik
2011-05-31 21:28     ` [PATCH v2] " Vaibhav Nagarnaik
2011-06-01  0:00       ` Frederic Weisbecker
2011-06-01 22:38         ` Vaibhav Nagarnaik
2011-06-01 23:30           ` David Sharp
2011-06-16  3:02             ` Frederic Weisbecker
2011-06-21 18:43               ` Vaibhav Nagarnaik
2011-07-06 23:43               ` H. Peter Anvin
2011-07-06 23:56                 ` Frederic Weisbecker
2011-07-07  0:02                   ` H. Peter Anvin
2011-07-07  0:25                     ` Frederic Weisbecker
2011-07-07  0:30                       ` H. Peter Anvin [this message]
2011-07-07  0:51                         ` Frederic Weisbecker
2011-07-07  9:57                         ` Ingo Molnar
2011-07-07 22:50                           ` David Sharp
2011-07-07 23:00                             ` Frederic Weisbecker
2011-06-21 18:45       ` [PATCH v3] " Vaibhav Nagarnaik
2011-07-06 21:50         ` Vaibhav Nagarnaik
2011-07-06 23:38           ` Andi Kleen
2011-07-07 23:34         ` Frederic Weisbecker
2011-07-08  0:54           ` David Sharp
2011-07-11 15:54             ` Frederic Weisbecker
2011-07-11 18:21               ` Vaibhav Nagarnaik
2011-07-12 18:09                 ` Frederic Weisbecker
2011-07-12 22:08                   ` Vaibhav Nagarnaik
2011-07-13 14:11                     ` Frederic Weisbecker
2011-07-13 18:18                       ` Vaibhav Nagarnaik
2011-04-29  0:14 ` [PATCH] trace: Add special x86 irq " Thomas Gleixner
2011-04-29 20:15   ` Vaibhav Nagarnaik

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