linux-kernel - Re: [PATCH 6/6][v3] perf: Document the ABI of perf sysfs entries

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Message-ID: <20130115185759.GG5826@ghostprotocols.net>
Date:	Tue, 15 Jan 2013 15:57:59 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Anton Blanchard <anton@....ibm.com>,
	Jiri Olsa <jolsa@...hat.com>, robert.richter@....com,
	linuxppc-dev@...abs.org, linux-kernel@...r.kernel.org,
	Stephane Eranian <eranian@...gle.com>,
	Andi Kleen <ak@...ux.intel.com>, Greg KH <greg@...ah.com>
Subject: Re: [PATCH 6/6][v3] perf: Document the ABI of perf sysfs entries

Em Wed, Jan 09, 2013 at 05:07:03PM -0800, Sukadev Bhattiprolu escreveu:
> [PATCH 6/6][v3] perf: Document the ABI of perf sysfs entries
> 
> This patchset addes two new sets of files to sysfs:
> 
> 	- generic and POWER-specific perf events in /sys/devices/cpu/events/
> 	- perf event config format in /sys/devices/cpu/format/event
> 
> Document the format of these files which would become part of the ABI.
> 
> Changelog[v3]:
> 	[Greg KH] Include ABI documentation.

Jiri, can I have your ack on this one too?

Greg, all ok now?

- Arnaldo
 
> Signed-off-by: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
> ---
>  Documentation/ABI/stable/sysfs-devices-cpu-events |   54 +++++++++++++++++++++
>  Documentation/ABI/stable/sysfs-devices-cpu-format |   27 ++++++++++
>  2 files changed, 81 insertions(+), 0 deletions(-)
>  create mode 100644 Documentation/ABI/stable/sysfs-devices-cpu-format
> 
> diff --git a/Documentation/ABI/stable/sysfs-devices-cpu-events b/Documentation/ABI/stable/sysfs-devices-cpu-events
> index e69de29..f37d542 100644
> --- a/Documentation/ABI/stable/sysfs-devices-cpu-events
> +++ b/Documentation/ABI/stable/sysfs-devices-cpu-events
> @@ -0,0 +1,54 @@
> +What:		/sys/devices/cpu/events/
> +		/sys/devices/cpu/events/branch-misses
> +		/sys/devices/cpu/events/cache-references
> +		/sys/devices/cpu/events/cache-misses
> +		/sys/devices/cpu/events/stalled-cycles-frontend
> +		/sys/devices/cpu/events/branch-instructions
> +		/sys/devices/cpu/events/stalled-cycles-backend
> +		/sys/devices/cpu/events/instructions
> +		/sys/devices/cpu/events/cpu-cycles
> +
> +Date:		2013/01/08
> +
> +Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
> +
> +Description:	Generic performance monitoring events
> +
> +		A collection of performance monitoring events that may be
> +		supported by many/most CPUs. These events can be monitored
> +		using the 'perf(1)' tool.
> +
> +		The contents of each file would look like:
> +
> +			event=0xNNNN
> +
> +		where 'N' is a hex digit.
> +
> +
> +What: 		/sys/devices/cpu/events/PM_LD_MISS_L1
> +		/sys/devices/cpu/events/PM_LD_REF_L1
> +		/sys/devices/cpu/events/PM_CYC
> +		/sys/devices/cpu/events/PM_BRU_FIN
> +		/sys/devices/cpu/events/PM_GCT_NOSLOT_CYC
> +		/sys/devices/cpu/events/PM_BRU_MPRED
> +		/sys/devices/cpu/events/PM_INST_CMPL
> +		/sys/devices/cpu/events/PM_CMPLU_STALL
> +
> +Date:		2013/01/08
> +
> +Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
> +		Linux Powerpc mailing list <linuxppc-dev@...abs.org>
> +
> +Description:	POWER specific performance monitoring events
> +
> +		A collection of performance monitoring events that may be
> +		supported by the POWER CPU. These events can be monitored
> +		using the 'perf(1)' tool.
> +
> +		These events may not be supported by other CPUs.
> +
> +		The contents of each file would look like:
> +
> +			event=0xNNNN
> +
> +		where 'N' is a hex digit.
> diff --git a/Documentation/ABI/stable/sysfs-devices-cpu-format b/Documentation/ABI/stable/sysfs-devices-cpu-format
> new file mode 100644
> index 0000000..b15cfb2
> --- /dev/null
> +++ b/Documentation/ABI/stable/sysfs-devices-cpu-format
> @@ -0,0 +1,27 @@
> +What:		/sys/devices/cpu/format/
> +		/sys/devices/cpu/format/event
> +
> +Date:		2013/01/08
> +
> +Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
> +
> +Description:	Format of performance monitoring events
> +
> +		Each CPU/architecture may use different format to represent
> +		the perf event.  The 'event' file describes the configuration
> +		format of the performance monitoring event on the CPU/system.
> +
> +		The contents of each file would look like:
> +
> +			config:m-n
> +
> +		where m and n are the starting and ending bits that are
> +		used to represent the event.
> +
> +		For example, on POWER,
> +
> +			$ cat /sys/devices/cpu/format/event
> +			config:0-20
> +
> +		meaning that POWER uses the first 20-bits to represent a perf
> +		event.
> -- 
> 1.7.1
--
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