[tip:perf/core] perf c2c report: Add dimension support

[tip-bot for Jiri Olsa <tipbot@zytor.com>]

Commit-ID:  c75540e3160fb5867a3d88ea195cb300e66f22c3
Gitweb:     http://git.kernel.org/tip/c75540e3160fb5867a3d88ea195cb300e66f22c3
Author:     Jiri Olsa <jolsa@kernel.org>
AuthorDate: Thu, 22 Sep 2016 17:36:41 +0200
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Wed, 19 Oct 2016 13:18:31 -0300

perf c2c report: Add dimension support

Adding bare bones of dimension support for c2c report.

Main interface functions are:

  c2c_hists__init
  c2c_hists__reinit

which re/initialize 'struct c2c_hists' object with sort/display entries
string, in a similar way that setup_sorting function does.

We overload the dimension to provide multi line header support for
sort/display entries.

Also we overload base 'struct perf_hpp_fmt' object with 'struct c2c_fmt'
to define c2c specific functions to deal with multi line headers and
spans.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1474558645-19956-14-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-c2c.c | 239 ++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 238 insertions(+), 1 deletion(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 3fac3a2..63c0e2d 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -10,8 +10,14 @@
 #include "tool.h"
 #include "data.h"
 
+struct c2c_hists {
+	struct hists		hists;
+	struct perf_hpp_list	list;
+};
+
 struct perf_c2c {
-	struct perf_tool tool;
+	struct perf_tool	tool;
+	struct c2c_hists	hists;
 };
 
 static struct perf_c2c c2c;
@@ -28,6 +34,231 @@ static const char * const __usage_report[] = {
 
 static const char * const *report_c2c_usage = __usage_report;
 
+#define C2C_HEADER_MAX 2
+
+struct c2c_header {
+	struct {
+		const char *text;
+		int	    span;
+	} line[C2C_HEADER_MAX];
+};
+
+struct c2c_dimension {
+	struct c2c_header	 header;
+	const char		*name;
+	int			 width;
+
+	int64_t (*cmp)(struct perf_hpp_fmt *fmt,
+		       struct hist_entry *, struct hist_entry *);
+	int   (*entry)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		       struct hist_entry *he);
+	int   (*color)(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		       struct hist_entry *he);
+};
+
+struct c2c_fmt {
+	struct perf_hpp_fmt	 fmt;
+	struct c2c_dimension	*dim;
+};
+
+static int c2c_width(struct perf_hpp_fmt *fmt,
+		     struct perf_hpp *hpp __maybe_unused,
+		     struct hists *hists __maybe_unused)
+{
+	struct c2c_fmt *c2c_fmt;
+
+	c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
+	return c2c_fmt->dim->width;
+}
+
+static int c2c_header(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		      struct hists *hists __maybe_unused, int line, int *span)
+{
+	struct c2c_fmt *c2c_fmt;
+	struct c2c_dimension *dim;
+	int len = c2c_width(fmt, hpp, hists);
+	const char *text;
+
+	c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
+	dim = c2c_fmt->dim;
+
+	text = dim->header.line[line].text;
+	if (text == NULL)
+		text = "";
+
+	if (*span) {
+		(*span)--;
+		return 0;
+	} else {
+		*span = dim->header.line[line].span;
+	}
+
+	return scnprintf(hpp->buf, hpp->size, "%*s", len, text);
+}
+
+static struct c2c_dimension *dimensions[] = {
+	NULL,
+};
+
+static void fmt_free(struct perf_hpp_fmt *fmt)
+{
+	struct c2c_fmt *c2c_fmt;
+
+	c2c_fmt = container_of(fmt, struct c2c_fmt, fmt);
+	free(c2c_fmt);
+}
+
+static bool fmt_equal(struct perf_hpp_fmt *a, struct perf_hpp_fmt *b)
+{
+	struct c2c_fmt *c2c_a = container_of(a, struct c2c_fmt, fmt);
+	struct c2c_fmt *c2c_b = container_of(b, struct c2c_fmt, fmt);
+
+	return c2c_a->dim == c2c_b->dim;
+}
+
+static struct c2c_dimension *get_dimension(const char *name)
+{
+	unsigned int i;
+
+	for (i = 0; dimensions[i]; i++) {
+		struct c2c_dimension *dim = dimensions[i];
+
+		if (!strcmp(dim->name, name))
+			return dim;
+	};
+
+	return NULL;
+}
+
+static struct c2c_fmt *get_format(const char *name)
+{
+	struct c2c_dimension *dim = get_dimension(name);
+	struct c2c_fmt *c2c_fmt;
+	struct perf_hpp_fmt *fmt;
+
+	if (!dim)
+		return NULL;
+
+	c2c_fmt = zalloc(sizeof(*c2c_fmt));
+	if (!c2c_fmt)
+		return NULL;
+
+	c2c_fmt->dim = dim;
+
+	fmt = &c2c_fmt->fmt;
+	INIT_LIST_HEAD(&fmt->list);
+	INIT_LIST_HEAD(&fmt->sort_list);
+
+	fmt->cmp	= dim->cmp;
+	fmt->sort	= dim->cmp;
+	fmt->entry	= dim->entry;
+	fmt->header	= c2c_header;
+	fmt->width	= c2c_width;
+	fmt->collapse	= dim->cmp;
+	fmt->equal	= fmt_equal;
+	fmt->free	= fmt_free;
+
+	return c2c_fmt;
+}
+
+static int c2c_hists__init_output(struct perf_hpp_list *hpp_list, char *name)
+{
+	struct c2c_fmt *c2c_fmt = get_format(name);
+
+	if (!c2c_fmt)
+		return -1;
+
+	perf_hpp_list__column_register(hpp_list, &c2c_fmt->fmt);
+	return 0;
+}
+
+static int c2c_hists__init_sort(struct perf_hpp_list *hpp_list, char *name)
+{
+	struct c2c_fmt *c2c_fmt = get_format(name);
+
+	if (!c2c_fmt)
+		return -1;
+
+	perf_hpp_list__register_sort_field(hpp_list, &c2c_fmt->fmt);
+	return 0;
+}
+
+#define PARSE_LIST(_list, _fn)							\
+	do {									\
+		char *tmp, *tok;						\
+		ret = 0;							\
+										\
+		if (!_list)							\
+			break;							\
+										\
+		for (tok = strtok_r((char *)_list, ", ", &tmp);			\
+				tok; tok = strtok_r(NULL, ", ", &tmp)) {	\
+			ret = _fn(hpp_list, tok);				\
+			if (ret == -EINVAL) {					\
+				error("Invalid --fields key: `%s'", tok);	\
+				break;						\
+			} else if (ret == -ESRCH) {				\
+				error("Unknown --fields key: `%s'", tok);	\
+				break;						\
+			}							\
+		}								\
+	} while (0)
+
+static int hpp_list__parse(struct perf_hpp_list *hpp_list,
+			   const char *output_,
+			   const char *sort_)
+{
+	char *output = output_ ? strdup(output_) : NULL;
+	char *sort   = sort_   ? strdup(sort_) : NULL;
+	int ret;
+
+	PARSE_LIST(output, c2c_hists__init_output);
+	PARSE_LIST(sort,   c2c_hists__init_sort);
+
+	/* copy sort keys to output fields */
+	perf_hpp__setup_output_field(hpp_list);
+
+	/*
+	 * We dont need other sorting keys other than those
+	 * we already specified. It also really slows down
+	 * the processing a lot with big number of output
+	 * fields, so switching this off for c2c.
+	 */
+
+#if 0
+	/* and then copy output fields to sort keys */
+	perf_hpp__append_sort_keys(&hists->list);
+#endif
+
+	free(output);
+	free(sort);
+	return ret;
+}
+
+static int c2c_hists__init(struct c2c_hists *hists,
+			   const char *sort)
+{
+	__hists__init(&hists->hists, &hists->list);
+
+	/*
+	 * Initialize only with sort fields, we need to resort
+	 * later anyway, and that's where we add output fields
+	 * as well.
+	 */
+	perf_hpp_list__init(&hists->list);
+
+	return hpp_list__parse(&hists->list, NULL, sort);
+}
+
+__maybe_unused
+static int c2c_hists__reinit(struct c2c_hists *c2c_hists,
+			     const char *output,
+			     const char *sort)
+{
+	perf_hpp__reset_output_field(&c2c_hists->list);
+	return hpp_list__parse(&c2c_hists->list, output, sort);
+}
+
 static int perf_c2c__report(int argc, const char **argv)
 {
 	struct perf_session *session;
@@ -52,6 +283,12 @@ static int perf_c2c__report(int argc, const char **argv)
 
 	file.path = input_name;
 
+	err = c2c_hists__init(&c2c.hists, "dcacheline");
+	if (err) {
+		pr_debug("Failed to initialize hists\n");
+		goto out;
+	}
+
 	session = perf_session__new(&file, 0, &c2c.tool);
 	if (session == NULL) {
 		pr_debug("No memory for session\n");