linux-kernel - [PATCH 05/16] perf Documentation: add event parameters

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Message-Id: <1401236684-10579-6-git-send-email-dev@codyps.com>
Date:	Tue, 27 May 2014 17:22:00 -0700
From:	Cody P Schafer <dev@...yps.com>
To:	LKML <linux-kernel@...r.kernel.org>,
	Linux PPC <linuxppc-dev@...ts.ozlabs.org>,
	Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Cody P Schafer <dev@...yps.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Runzhen Wang <runzhen@...ux.vnet.ibm.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	linux-doc@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>
Subject: [PATCH 05/16] perf Documentation: add event parameters

Event parameters are a basic way for partial events to be specified in
sysfs with per-event names given to the fields that need to be filled in
when using a particular event.

It is intended for supporting cases where the single 'cpu' parameter is
insufficient. For example, POWER 8 has events for physical
sockets/cores/cpus that are accessible from with virtual machines. To
keep using the single 'cpu' parameter we'd need to perform a mapping
between Linux's cpus and the physical machine's cpus (in this case
Linux is running under a hypervisor). This isn't possible because
bindings between our cpus and physical cpus may not be fixed, and we
probably won't have a "cpu" on each physical cpu.

CC: Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Signed-off-by: Cody P Schafer <dev@...yps.com>
---
 Documentation/ABI/testing/sysfs-bus-event_source-devices-events | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
index 20979f8..c1f9850 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
@@ -52,12 +52,18 @@ Description:	Per-pmu performance monitoring events specific to the running syste
 			event=0x2abc
 			event=0x423,inv,cmask=0x3
 			domain=0x1,offset=0x8,starting_index=0xffff
+			domain=0x1,offset=0x8,starting_index=phys_cpu

 		Each of the assignments indicates a value to be assigned to a
 		particular set of bits (as defined by the format file
 		corresponding to the <term>) in the perf_event structure passed
 		to the perf_open syscall.

+		In the case of the last example, a value replacing "phys_cpu"
+		would need to be provided by the user selecting the particular
+		event. This is refered to as "event parameterization". All
+		non-numerical values indicate an event parameter.
+
 What: /sys/bus/event_source/devices/<pmu>/events/<event>.unit
 Date: 2014/02/24
 Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
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