linux-kernel - [RFC PATCH] perf tools: Add a place to put kernel config fragments for test runs

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Date:   Wed, 14 Jun 2023 15:02:19 +0100
From:   James Clark <james.clark@....com>
To:     linux-perf-users@...r.kernel.org
Cc:     broonie@...nel.org, Aishwarya.TCV@....com,
        James Clark <james.clark@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-kernel@...r.kernel.org
Subject: [RFC PATCH] perf tools: Add a place to put kernel config fragments for test runs

We are currently keeping something like this in our CI because defconfig
doesn't give full coverage. It's not complete yet, but is a starting
point as a place to add to when a specific test needs something extra to
run.

The RFC is for discussion on folder placement and file naming etc.

Signed-off-by: James Clark <james.clark@....com>
---
 tools/perf/tests/config-fragments/README  |  7 +++++++
 tools/perf/tests/config-fragments/aarch64 |  1 +
 tools/perf/tests/config-fragments/config  | 11 +++++++++++
 3 files changed, 19 insertions(+)
 create mode 100644 tools/perf/tests/config-fragments/README
 create mode 100644 tools/perf/tests/config-fragments/aarch64
 create mode 100644 tools/perf/tests/config-fragments/config

diff --git a/tools/perf/tests/config-fragments/README b/tools/perf/tests/config-fragments/README
new file mode 100644
index 000000000000..e816cfb1b96d
--- /dev/null
+++ b/tools/perf/tests/config-fragments/README
@@ -0,0 +1,7 @@
+This folder is for kernel config fragments that can be merged with
+defconfig to give full test coverage of a perf test run. This is only
+an optimistic set as some features require hardware support in order to
+pass and not skip.
+
+'config' is shared across all platforms, and for arch specific files,
+the file name should match that returned by 'uname -m'.
diff --git a/tools/perf/tests/config-fragments/aarch64 b/tools/perf/tests/config-fragments/aarch64
new file mode 100644
index 000000000000..64c4ab17cd58
--- /dev/null
+++ b/tools/perf/tests/config-fragments/aarch64
@@ -0,0 +1 @@
+CONFIG_CORESIGHT_SOURCE_ETM4X=y
diff --git a/tools/perf/tests/config-fragments/config b/tools/perf/tests/config-fragments/config
new file mode 100644
index 000000000000..c340b3195fca
--- /dev/null
+++ b/tools/perf/tests/config-fragments/config
@@ -0,0 +1,11 @@
+CONFIG_TRACEPOINTS=y
+CONFIG_STACKTRACE=y
+CONFIG_NOP_TRACER=y
+CONFIG_RING_BUFFER=y
+CONFIG_EVENT_TRACING=y
+CONFIG_CONTEXT_SWITCH_TRACER=y
+CONFIG_TRACING=y
+CONFIG_GENERIC_TRACER=y
+CONFIG_FTRACE=y
+CONFIG_FTRACE_SYSCALLS=y
+CONFIG_BRANCH_PROFILE_NONE=y
-- 
2.34.1