linux-kernel - Re: [PATCH 2/6] tracing: increase size of number of possible events

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Date:	Fri, 24 Apr 2009 09:12:24 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 2/6] tracing: increase size of number of possible events


* Steven Rostedt <rostedt@...dmis.org> wrote:

> From: Steven Rostedt <srostedt@...hat.com>
> 
> With the new event tracing registration, we must increase the number
> of events that can be registered. Currently the type field is only
> one byte, which leaves us only 256 possible events.
> 
> Since we do not save the CPU number in the tracer anymore (it is determined
> by the per cpu ring buffer that is used) we have an extra byte to use.
> 
> This patch increases the size of type from 1 byte (256 events) to
> 2 bytes (65,536 events).
> 
> It also adds a WARN_ON_ONCE if we exceed that limit.
> 
> [ Impact: allow more than 255 events ]

> -	int			type;
> +	unsigned short		type;

Hm, the changelog is not valid anymore - as here we really cut it 
down from 4 billion to 64K, right?

	Ingo
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