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Subject[PATCH v2 2/4] perf diff: Add diff.order config option
Date
In many cases, I need to look at differences between two data so I often
used the -o option to sort the result base on the difference first.
It'd be nice to have a config option to set it by default.

The diff.order config option is to set the default value of -o/--order
option.

Cc: Taeung Song <treeze.taeung@gmail.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/Documentation/perf-config.txt | 7 +++++++
tools/perf/Documentation/perf-diff.txt | 6 +++++-
tools/perf/builtin-diff.c | 14 ++++++++++++++
3 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/tools/perf/Documentation/perf-config.txt b/tools/perf/Documentation/perf-config.txt
index 9365b75fd04f..5b54d47ef713 100644
--- a/tools/perf/Documentation/perf-config.txt
+++ b/tools/perf/Documentation/perf-config.txt
@@ -498,6 +498,13 @@ Variables
But if this option is 'no-cache', it will not update the build-id cache.
'skip' skips post-processing and does not update the cache.

+diff.*::
+ diff.order::
+ This option sets the number of column to sort the result.
+ Default is 0 which means sorting by baseline.
+ Setting it to 1 will sort the result by delta (or other
+ compute method selected).
+
SEE ALSO
--------
linkperf:perf[1]
diff --git a/tools/perf/Documentation/perf-diff.txt b/tools/perf/Documentation/perf-diff.txt
index af80284cd2f6..6ba3bf582d79 100644
--- a/tools/perf/Documentation/perf-diff.txt
+++ b/tools/perf/Documentation/perf-diff.txt
@@ -99,7 +99,11 @@ OPTIONS

-o::
--order::
- Specify compute sorting column number.
+ Specify compute sorting column number. 0 means sorting by baseline
+ overhead (default) and 1 means sorting by computed value of column 1
+ (data from the first file other base baseline). Values more than 1
+ can be used only if enough data files are provided.
+ Default value can be set using diff.order config option.

--percentage::
Determine how to display the overhead percentage of filtered entries.
diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 781c9e60bd21..181ff996e039 100644
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -17,6 +17,7 @@
#include "util/symbol.h"
#include "util/util.h"
#include "util/data.h"
+#include "util/config.h"

#include <stdlib.h>
#include <math.h>
@@ -1291,6 +1292,17 @@ static int data_init(int argc, const char **argv)
return 0;
}

+static int diff__config(const char *var, const char *value,
+ void *cb __maybe_unused)
+{
+ if (!strcmp(var, "diff.order")) {
+ sort_compute = perf_config_int(var, value);
+ return 0;
+ }
+
+ return 0;
+}
+
int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
{
int ret = hists__init();
@@ -1298,6 +1310,8 @@ int cmd_diff(int argc, const char **argv, const char *prefix __maybe_unused)
if (ret < 0)
return ret;

+ perf_config(diff__config, NULL);
+
argc = parse_options(argc, argv, options, diff_usage, 0);

if (symbol__init(NULL) < 0)
--
2.11.0
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