[PATCH v3 4/5] perf report: Support --percent-limit for total_cycles

[Jin Yao]

We have already supported the 'total_cycles' option in previous
patch. It's also useful to show entries only above a threshold
percent.

This patch enables '--percent-limit' for not showing entries
under that percent.

For example,

 perf report -s total_cycles --stdio --percent-limit 1

 # To display the perf.data header info, please use --header/--header-only options.
 #
 #
 # Total Lost Samples: 0
 #
 # Samples: 2M of event 'cycles'
 # Event count (approx.): 2753248
 #
 # Sampled Cycles%  Sampled Cycles  Avg Cycles%  Avg Cycles                                              [Program Block Range]         Shared Object
 # ...............  ..............  ...........  ..........  .................................................................  ....................
 #
            26.04%            2.8M        0.40%          18                                             [div.c:42 -> div.c:39]                   div
            15.17%            1.2M        0.16%           7                                 [random_r.c:357 -> random_r.c:380]          libc-2.27.so
             5.11%          402.0K        0.04%           2                                             [div.c:27 -> div.c:28]                   div
             4.87%          381.6K        0.04%           2                                     [random.c:288 -> random.c:291]          libc-2.27.so
             4.53%          381.0K        0.04%           2                                             [div.c:40 -> div.c:40]                   div
             3.85%          300.9K        0.02%           1                                             [div.c:22 -> div.c:25]                   div
             3.08%          241.1K        0.02%           1                                           [rand.c:26 -> rand.c:27]          libc-2.27.so
             3.06%          240.0K        0.02%           1                                     [random.c:291 -> random.c:291]          libc-2.27.so
             2.78%          215.7K        0.02%           1                                     [random.c:298 -> random.c:298]          libc-2.27.so
             2.52%          198.3K        0.02%           1                                     [random.c:293 -> random.c:293]          libc-2.27.so
             2.36%          184.8K        0.02%           1                                           [rand.c:28 -> rand.c:28]          libc-2.27.so
             2.33%          180.5K        0.02%           1                                     [random.c:295 -> random.c:295]          libc-2.27.so
             2.28%          176.7K        0.02%           1                                     [random.c:295 -> random.c:295]          libc-2.27.so
             2.20%          168.8K        0.02%           1                                         [rand@plt+0 -> rand@plt+0]                   div
             1.98%          158.2K        0.02%           1                                 [random_r.c:388 -> random_r.c:388]          libc-2.27.so
             1.57%          123.3K        0.02%           1                                             [div.c:42 -> div.c:44]                   div
             1.44%          116.0K        0.42%          19                                 [random_r.c:357 -> random_r.c:394]          libc-2.27.so

It only shows the entries which 'Sampled Cycles%' > 1%.

 v3:
 ---
 Minor change since the function name is changed:
 block_total_cycles_percent -> block_info__total_cycles_percent

Signed-off-by: Jin Yao <yao.jin@xxxxxxxxxxxxxxx>
---
 tools/perf/builtin-report.c  |  2 +-
 tools/perf/ui/stdio/hist.c   |  7 ++++++-
 tools/perf/util/block-info.c | 10 ++++++++++
 tools/perf/util/block-info.h |  2 ++
 4 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/tools/perf/builtin-report.c b/tools/perf/builtin-report.c
index 44aed40e9071..dbae1812ce47 100644
--- a/tools/perf/builtin-report.c
+++ b/tools/perf/builtin-report.c
@@ -794,7 +794,7 @@ static int hists__fprintf_all_blocks(struct hists *hists, struct report *rep)
 
 	get_block_hists(hists, bh, rep);
 	symbol_conf.report_individual_block = true;
-	hists__fprintf(&bh->block_hists, true, 0, 0, 0,
+	hists__fprintf(&bh->block_hists, true, 0, 0, rep->min_percent,
 		       stdout, true);
 	hists__delete_entries(&bh->block_hists);
 	return 0;
diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 655ef7708cd0..132056c7d5b7 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -15,6 +15,7 @@
 #include "../../util/srcline.h"
 #include "../../util/string2.h"
 #include "../../util/thread.h"
+#include "../../util/block-info.h"
 #include <linux/ctype.h>
 #include <linux/zalloc.h>
 
@@ -856,7 +857,11 @@ size_t hists__fprintf(struct hists *hists, bool show_header, int max_rows,
 		if (h->filtered)
 			continue;
 
-		percent = hist_entry__get_percent_limit(h);
+		if (symbol_conf.report_individual_block)
+			percent = block_info__total_cycles_percent(h);
+		else
+			percent = hist_entry__get_percent_limit(h);
+
 		if (percent < min_pcnt)
 			continue;
 
diff --git a/tools/perf/util/block-info.c b/tools/perf/util/block-info.c
index b9954a32b8f4..376632923f75 100644
--- a/tools/perf/util/block-info.c
+++ b/tools/perf/util/block-info.c
@@ -127,3 +127,13 @@ int block_info__process_sym(struct hist_entry *he, struct block_hist *bh,
 
 	return 0;
 }
+
+float block_info__total_cycles_percent(struct hist_entry *he)
+{
+	struct block_info *bi = he->block_info;
+
+	if (bi->total_cycles)
+		return bi->cycles * 100.0 / bi->total_cycles;
+
+	return 0.0;
+}
diff --git a/tools/perf/util/block-info.h b/tools/perf/util/block-info.h
index d55dfc2fda6f..b21057beed00 100644
--- a/tools/perf/util/block-info.h
+++ b/tools/perf/util/block-info.h
@@ -40,4 +40,6 @@ int64_t block_info__cmp(struct perf_hpp_fmt *fmt __maybe_unused,
 int block_info__process_sym(struct hist_entry *he, struct block_hist *bh,
 			    u64 *block_cycles_aggr, u64 total_cycles);
 
+float block_info__total_cycles_percent(struct hist_entry *he);
+
 #endif /* __PERF_BLOCK_H */
-- 
2.17.1