linux-kernel - Re: [PATCH v1 4/5] perf: Introduce address range filtering

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Message-ID: <20160425142506.GJ3430@twins.programming.kicks-ass.net>
Date:	Mon, 25 Apr 2016 16:25:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	vince@...ter.net, eranian@...gle.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v1 4/5] perf: Introduce address range filtering

On Fri, Apr 22, 2016 at 07:19:11PM +0300, Alexander Shishkin wrote:
> +/*
> + * Address range filtering: limiting the data to certain
> + * instruction address ranges. Filters are ioctl()ed to us from
> + * userspace as ascii strings.
> + *
> + * Filter string format:
> + *
> + * ACTION SOURCE:RANGE_SPEC
> + * where ACTION is one of the
> + *  * "filter": limit the trace to this region
> + *  * "start": start tracing from this address
> + *  * "stop": stop tracing at this address/region;
> + * SOURCE is either "file" or "kernel"
> + * RANGE_SPEC is
> + *  * for "kernel": <start address>[/<size>]
> + *  * for "file":   <start address>[/<size>]@</path/to/object/file>

SOURCE seems entirely redundant

> + *
> + * if <size> is not specified, the range is treated as a single address.

single instruction, right?