linux-kernel - Re: [RFC][PATCH] tracing: Remove useless 4 bytes of padding from every event

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Message-ID: <CA+55aFzVngkixn-t0mK8QqgnPhCzN2AsUtzfZ3BkLiJAcjNOzQ@mail.gmail.com>
Date:	Wed, 16 May 2012 12:33:59 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Sharp <dsharp@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][PATCH] tracing: Remove useless 4 bytes of padding from
 every event

On Wed, May 16, 2012 at 6:44 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
>
> But this change will break PowerTop v1. Thus my question is, how long do
> we need to keep this wasted space in the ring buffers to satisfy an out
> of date tool?

The wasted space seems of limited importance.

More important is to check which distros have the new powertop.

F16 and F17 seem to have powertop-1.98, which I assume is the new
world order already. But maybe I assume incorrectly.

F14 (which I personally still use, since it doesn't have gnome3) is 1.13.

SuSE, Ubuntu?

                    Linus
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