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@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/083f5422-ece9-10dd-8305-bf59c860f10f@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 02b4aa2..8f0c2be 100644 (file)
--- 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 3fdfbae..6c3719a 100644 (file)
--- 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()
 };