perf c2c report: Add cacheline address count column

Adding the 'PA cnt' column grouped under data cacheline address.

It shows how many times the physical addresses changed for the hist
entry. It does not show the number of different physical addresses for
entry, because we don't store those. We only track the number of times
we got different address than we currently hold, which is not expensive
and gives similar info.

$ perf c2c report --stdio

# ----------- Cacheline ---------- Total Tot ----- LLC Load Hitm -----
# Index Address Node PA cnt records Hitm Total Lcl Rmt
# ..... .................. .... ...... ....... ....... ....... ....... .......
#
0 0xffff9ad56dca0a80 0 9 10 7.69% 2 2 0
1 0xffff9ad56dce0a80 0 9 9 7.69% 2 2 0
2 0xffff9ad37659ad80 0 1 2 3.85% 1 1 0

...

# ----- HITM ----- -- Store Refs -- --------- Data address ---------
# Num Rmt Lcl L1 Hit L1 Miss Offset Node PA cnt Pid
# ..... ....... ....... ....... ....... .................. .... ...... .......
#
-------------------------------------------------------------
0 0 2 3 0 0xffff9ad56dca0a80
-------------------------------------------------------------
0.00% 0.00% 33.33% 0.00% 0x0 0 1 2510
0.00% 0.00% 33.33% 0.00% 0x4 0 1 2476
0.00% 0.00% 33.33% 0.00% 0x20 0 1 0
0.00% 100.00% 0.00% 0.00% 0x38 0 1 0

Signed-off-by: Jiri Olsa <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: David Ahern <[e-mail]>
Cc: Joe Mario <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/builtin-c2c.c

···
 	return scnprintf(hpp->buf, hpp->size, "%*s", width, c2c_he->nodestr);
 }
 
+static int
+dcacheline_node_count(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
+		      struct hist_entry *he)
+{
+	struct c2c_hist_entry *c2c_he;
+	int width = c2c_width(fmt, hpp, he->hists);
+
+	c2c_he = container_of(he, struct c2c_hist_entry, he);
+	return scnprintf(hpp->buf, hpp->size, "%*lu", width, c2c_he->paddr_cnt);
+}
+
 static int offset_entry(struct perf_hpp_fmt *fmt, struct perf_hpp *hpp,
 			struct hist_entry *he)
 {
···
 	}
 
 static struct c2c_dimension dim_dcacheline = {
-	.header		= HEADER_SPAN("--- Cacheline ----", "Address", 1),
+	.header		= HEADER_SPAN("--- Cacheline ----", "Address", 2),
 	.name		= "dcacheline",
 	.cmp		= dcacheline_cmp,
 	.entry		= dcacheline_entry,
···
 	.width		= 4,
 };
 
-static struct c2c_header header_offset_tui = HEADER_SPAN("-----", "Off", 1);
+static struct c2c_dimension dim_dcacheline_count = {
+	.header		= HEADER_LOW("PA cnt"),
+	.name		= "dcacheline_count",
+	.cmp		= empty_cmp,
+	.entry		= dcacheline_node_count,
+	.width		= 6,
+};
+
+static struct c2c_header header_offset_tui = HEADER_SPAN("-----", "Off", 2);
 
 static struct c2c_dimension dim_offset = {
-	.header		= HEADER_SPAN("--- Data address -", "Offset", 1),
+	.header		= HEADER_SPAN("--- Data address -", "Offset", 2),
 	.name		= "offset",
 	.cmp		= offset_cmp,
 	.entry		= offset_entry,
···
 static struct c2c_dimension *dimensions[] = {
 	&dim_dcacheline,
 	&dim_dcacheline_node,
+	&dim_dcacheline_count,
 	&dim_offset,
 	&dim_offset_node,
 	&dim_iaddr,
···
 
 	/* Fix the zero line for dcacheline column. */
 	buf = fill_line("Cacheline", dim_dcacheline.width +
-				     dim_dcacheline_node.width + 2);
+				     dim_dcacheline_node.width +
+				     dim_dcacheline_count.width + 4);
 	if (!buf)
 		return -ENOMEM;
 
···
 
 	/* Fix the zero line for offset column. */
 	buf = fill_line(nodestr, dim_offset.width +
-			      dim_offset_node.width + 2);
+			         dim_offset_node.width +
+				 dim_dcacheline_count.width + 4);
 	if (!buf)
 		return -ENOMEM;
 
···
 		"percent_lcl_hitm,"
 		"percent_stores_l1hit,"
 		"percent_stores_l1miss,"
-		"offset,offset_node,",
+		"offset,offset_node,dcacheline_count,",
 		add_pid   ? "pid," : "",
 		add_tid   ? "tid," : "",
 		add_iaddr ? "iaddr," : "",
···
 			"cl_idx,"
 			"dcacheline,"
 			"dcacheline_node,"
+			"dcacheline_count,"
 			"tot_recs,"
 			"percent_hitm,"
 			"tot_hitm,lcl_hitm,rmt_hitm,"