linux-kernel - Re: [PATCH v2 5/7] perf: Introduce address range filtering

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Message-ID: <20160503085651.GL3430@twins.programming.kicks-ass.net>
Date:	Tue, 3 May 2016 10:56:51 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Borislav Petkov <bp@...en8.de>, 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>,
	"Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Subject: Re: [PATCH v2 5/7] perf: Introduce address range filtering

On Wed, Apr 27, 2016 at 06:44:46PM +0300, Alexander Shishkin wrote:
> Many instruction trace pmus out there support address range-based
> filtering, which would, for example, generate trace data only for a
> given range of instruction addresses, which is useful for tracing
> individual functions, modules or libraries. Other pmus may also
> utilize this functionality to allow filtering to or filtering out
> code at certain address ranges.
> 
> This patch introduces the interface for userspace to specify these
> filters and for the pmu drivers to apply these filters to hardware
> configuration.
> 
> The user interface is an ascii string that is passed via an ioctl
> and specifies (in the form of an ascii string) address ranges within
> certain object files or within kernel. There is no special treatment
> for kernel modules yet, but it might be a worthy pursuit.
> 
> The pmu driver interface basically add two extra callbacks to the
> pmu driver structure, one of which validates the filter configuration
> proposed by the user against what the hardware is actually capable of
> doing and the other one translates hardware-independent filter
> configuration into something that can be programmed into the
> hardware.

Alexander, could you please write a manpage patch for this new API?