linux-kernel - [RFC 4/4] perf Documentation: Document the per PMU perf_event

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Message-Id: <20180626153642.5587-5-tvrtko.ursulin@linux.intel.com>
Date:   Tue, 26 Jun 2018 16:36:42 +0100
From:   Tvrtko Ursulin <tursulin@...ulin.net>
To:     linux-kernel@...r.kernel.org
Cc:     Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        x86@...nel.org
Subject: [RFC 4/4] perf Documentation: Document the per PMU perf_event_paranoid interface

From: Tvrtko Ursulin <tvrtko.ursulin@...el.com>

Explain behaviour of the new control knob along side the existing perf
event documentation.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Madhavan Srinivasan <maddy@...ux.vnet.ibm.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Cc: x86@...nel.org
---
 .../testing/sysfs-bus-event_source-devices-events  | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
index 505f080d20a1..b3096ae9be6f 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
@@ -92,3 +92,17 @@ Description:	Perf event scaling factors
 
 		This is provided to avoid performing floating point arithmetic
 		in the kernel.
+
+What: /sys/bus/event_source/devices/<pmu>/perf_event_paranoid
+Date: 2018/06/26
+Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
+Description:	Per PMU access control file
+
+		This is the per PMU version of the perf_event_paranoid sysctl
+		which allows controlling the access control level for each
+		individual PMU.
+
+		Writes to the sysctl will propagate to all PMU providers.
+
+		For explanation of supported values please consult the sysctl
+		documentation.
-- 
2.17.1