Commit f4fe11b7 authored by Alexey Budankov's avatar Alexey Budankov Committed by Arnaldo Carvalho de Melo
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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: default avatarAlexey 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: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
parent af63147c

tools/perf/Documentation/perf-record.txt

+5 −0
Original line number Diff line number Diff line
@@ -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.

tools/perf/builtin-record.c

+18 −0
Original line number Diff line number Diff line
@@ -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()

};

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