linux-kernel - [tip:perf/core] perf record: Implement --affinity=node|cpu option

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Date:   Fri, 15 Feb 2019 01:25:06 -0800
From:   tip-bot for Alexey Budankov <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org, hpa@...or.com,
        peterz@...radead.org, alexander.shishkin@...ux.intel.com,
        alexey.budankov@...ux.intel.com, namhyung@...nel.org,
        jolsa@...hat.com, mingo@...nel.org, acme@...hat.com,
        ak@...ux.intel.com
Subject: [tip:perf/core] perf record: Implement --affinity=node|cpu option

Commit-ID:  f4fe11b7bf7ff6a1ccf15d7a9484f0ff7d1e92ae
Gitweb:     https://git.kernel.org/tip/f4fe11b7bf7ff6a1ccf15d7a9484f0ff7d1e92ae
Author:     Alexey Budankov <alexey.budankov@...ux.intel.com>
AuthorDate: Tue, 22 Jan 2019 20:52:03 +0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 11 Feb 2019 12:32:21 -0300

perf record: Implement --affinity=node|cpu option

Implement --affinity=node|cpu option for the record mode defaulting
to system affinity mask bouncing.

Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/083f5422-ece9-10dd-8305-bf59c860f10f@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Documentation/perf-record.txt |  5 +++++
 tools/perf/builtin-record.c              | 18 ++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 02b4aa2621e7..8f0c2be34848 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -454,6 +454,11 @@ Use <n> control blocks in asynchronous (Posix AIO) trace writing mode (default:
 Asynchronous mode is supported only when linking Perf tool with libc library
 providing implementation for Posix AIO API.
 
+--affinity=mode::
+Set affinity mask of trace reading thread according to the policy defined by 'mode' value:
+  node - thread affinity mask is set to NUMA node cpu mask of the processed mmap buffer
+  cpu  - thread affinity mask is set to cpu of the processed mmap buffer
+
 --all-kernel::
 Configure all used events to run in kernel space.
 
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 3fdfbaebd95e..6c3719ac901d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1656,6 +1656,21 @@ static int parse_clockid(const struct option *opt, const char *str, int unset)
 	return -1;
 }
 
+static int record__parse_affinity(const struct option *opt, const char *str, int unset)
+{
+	struct record_opts *opts = (struct record_opts *)opt->value;
+
+	if (unset || !str)
+		return 0;
+
+	if (!strcasecmp(str, "node"))
+		opts->affinity = PERF_AFFINITY_NODE;
+	else if (!strcasecmp(str, "cpu"))
+		opts->affinity = PERF_AFFINITY_CPU;
+
+	return 0;
+}
+
 static int record__parse_mmap_pages(const struct option *opt,
 				    const char *str,
 				    int unset __maybe_unused)
@@ -1964,6 +1979,9 @@ static struct option __record_options[] = {
 		     &nr_cblocks_default, "n", "Use <n> control blocks in asynchronous trace writing mode (default: 1, max: 4)",
 		     record__aio_parse),
 #endif
+	OPT_CALLBACK(0, "affinity", &record.opts, "node|cpu",
+		     "Set affinity mask of trace reading thread to NUMA node cpu mask or cpu of processed mmap buffer",
+		     record__parse_affinity),
 	OPT_END()
 };