linux-kernel - Re: [PATCH v2 4/4] clock: add perf

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Date:	Wed, 18 Feb 2015 20:00:16 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, acme@...hat.com,
	peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com,
	jolsa@...hat.com, namhyung@...nel.org, cel@...ibm.com,
	sukadev@...ux.vnet.ibm.com, sonnyrao@...omium.org,
	johnmccutchan@...gle.com, dsahern@...il.com,
	adrian.hunter@...el.com, pawell.moll@....com
Subject: Re: [PATCH v2 4/4] clock: add perf_clock posix clock

Whitespace trivialities follow.

On Wed, 2015-02-18 at 18:21 +0100, Stephane Eranian wrote:
> This patch is a re-packaging of David's Ahern
> posix perf clock available here:
> 
> 	https://github.com/dsahern/linux/blob/perf-full-monty/README.ahern
> 
> The patch itself is based on Pawel Moll's original post:
> 
> 	https://lkml.org/lkml/2013/3/14/523
> 
> The new clock is call PERF_CLOCK. To use it
> 
> 	#include <time.h>
> 	#include <linux/time.h>
> 
> 	struct timespec ts;
> 
> 	clock_gettime(PERF_CLOCK, &ts);
> 
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
>  include/uapi/linux/time.h      |  1 +
>  kernel/time/Kconfig            |  6 +++++
>  kernel/time/Makefile           |  1 +
>  kernel/time/perf_posix_clock.c | 54 ++++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 62 insertions(+)
>  create mode 100644 kernel/time/perf_posix_clock.c
> 
> diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
> index e75e1b6..9066bf0 100644
> --- a/include/uapi/linux/time.h
> +++ b/include/uapi/linux/time.h
> @@ -56,6 +56,7 @@ struct itimerval {
>  #define CLOCK_BOOTTIME_ALARM		9
>  #define CLOCK_SGI_CYCLE			10	/* Hardware specific */
>  #define CLOCK_TAI			11
> +#define CLOCK_PERF			12
>  
>  #define MAX_CLOCKS			16
>  #define CLOCKS_MASK			(CLOCK_REALTIME | CLOCK_MONOTONIC)
> diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
> index d626dc9..6e4b707 100644
> --- a/kernel/time/Kconfig
> +++ b/kernel/time/Kconfig
> @@ -201,5 +201,11 @@ config HIGH_RES_TIMERS
>  	  hardware is not capable then this option only increases
>  	  the size of the kernel image.
>  
> +config PERF_CLOCK
> +	tristate "Perf_events posix clock timer source"
> +	help
> +	  This option adds a new posix clock timer source which uses the same time
> +	  source as the perf_events subsystem. It makes it possible to correlate
> +          user level samples with perf_events samples.

Tab and two spaces followed by an empty line here, please.

>  endmenu
>  endif

Thanks,


Paul Bolle

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