linux-kernel - Re: [PATCH 3/3] perf: Allow kernel filters on cpu events

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Date:   Fri, 10 Feb 2017 09:07:56 +0100
From:   Ingo Molnar <mingo@...nel.org>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        vince@...ter.net, eranian@...gle.com,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH 3/3] perf: Allow kernel filters on cpu events


* Alexander Shishkin <alexander.shishkin@...ux.intel.com> wrote:

> While supporting file-based address filters for cpu events requires some
> extra context switch handling, kernel address filters are easy, since the
> kernel mapping is preserved across address spaces. It is also useful as
> it permits tracing scheduling paths of the kernel.
> 
> This patch allows setting up kernel filters for cpu events.
> 
> Signed-off-by: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  include/linux/perf_event.h |  2 ++
>  kernel/events/core.c       | 42 ++++++++++++++++++++++++++++--------------
>  2 files changed, 30 insertions(+), 14 deletions(-)
> 
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index fcb37c81ca..f4ea0600b2 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -486,6 +486,7 @@ struct perf_addr_filter {
>   * @list:	list of filters for this event
>   * @lock:	spinlock that serializes accesses to the @list and event's
>   *		(and its children's) filter generations.
> + * @nr_file_filters:	number of file-based filters

I've applied the patch, but please for heaven's sake, when you add such a long, 
long argument name, at minimum re-tabulate the documentation section to look good 
again ...

Thanks,

	Ingo