linux-kernel - Re: [PATCH 1/2] perf: Add persistent events

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Date:	Fri, 28 May 2010 17:17:40 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Borislav Petkov <bp@...en8.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Lin Ming <ming.m.lin@...el.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] perf: Add persistent events

On Fri, 2010-05-28 at 16:33 +0200, Ingo Molnar wrote:

> >  2) get these things a buffer, perf_events as created don't actually
> >     have an output buffer, normally that is created at mmap() time, but
> >     since you cannot mmap() a kernel side event, it doesn't get to have
> >     a buffer. This could be done by extracting perf_mmap_data_alloc()
> >     into a sensible interface.
> 
> #2 could be a new syscall: sys_create_ring_buffer or so?

No, they need a buffer in-kernel, syscalls aren't the ideal tool for
that :-)

I've got patches refactoring the whole buffer stuff to make it more a
self-contained entity.
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