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Message-ID: <20090424071224.GD24912@elte.hu> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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