[PATCH v2 3/7] perf tools: Fix command line filters in hierarchy mode

[Namhyung Kim <namhyung@kernel.org>]

When a command-line filter was applied in hierarchy mode, output was
broken especially when filtering on lower level.  The higher level
entries didn't show up so it's hard to see the result.

Also it needs to handle multi sort keys in a single level of hierarchy.

Before:

  $ perf report --hierarchy -s 'cpu,{dso,comm}' --comms swapper --stdio
  ...
  #    Overhead  CPU / Shared Object+Command
  # ...........  ...........................
  #
         13.79%     [kernel.vmlinux]  swapper
      31.71%     000
         13.80%     [kernel.vmlinux]  swapper
          0.43%     [e1000e]          swapper
         11.89%     [kernel.vmlinux]  swapper
          9.18%     [kernel.vmlinux]  swapper

After:

  #    Overhead  CPU / Shared Object+Command
  # ...........  ...............................
  #
      33.09%     003
         13.79%     [kernel.vmlinux]  swapper
      31.71%     000
         13.80%     [kernel.vmlinux]  swapper
          0.43%     [e1000e]          swapper
      21.90%     002
         11.89%     [kernel.vmlinux]  swapper
      13.30%     001
          9.18%     [kernel.vmlinux]  swapper

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
 tools/perf/util/hist.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 97 insertions(+), 3 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 29da9e0d8db9..a98f9345f686 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -1087,10 +1087,103 @@ int hist_entry__snprintf_alignment(struct hist_entry *he, struct perf_hpp *hpp,
  */
 
 static void hists__apply_filters(struct hists *hists, struct hist_entry *he);
+static void hists__remove_entry_filter(struct hists *hists, struct hist_entry *he,
+				       enum hist_filter type);
+
+typedef bool (*fmt_chk_fn)(struct perf_hpp_fmt *fmt);
+
+static bool check_thread_entry(struct perf_hpp_fmt *fmt)
+{
+	return perf_hpp__is_thread_entry(fmt) || perf_hpp__is_comm_entry(fmt);
+}
+
+static void hist_entry__check_and_remove_filter(struct hist_entry *he,
+						enum hist_filter type,
+						fmt_chk_fn check)
+{
+	struct perf_hpp_fmt *fmt;
+	bool type_match = false;
+	struct hist_entry *parent = he->parent_he;
+
+	switch (type) {
+	case HIST_FILTER__THREAD:
+		if (symbol_conf.comm_list == NULL &&
+		    symbol_conf.pid_list == NULL &&
+		    symbol_conf.tid_list == NULL)
+			return;
+		break;
+	case HIST_FILTER__DSO:
+		if (symbol_conf.dso_list == NULL)
+			return;
+		break;
+	case HIST_FILTER__SYMBOL:
+		if (symbol_conf.sym_list == NULL)
+			return;
+		break;
+	case HIST_FILTER__PARENT:
+	case HIST_FILTER__GUEST:
+	case HIST_FILTER__HOST:
+	case HIST_FILTER__SOCKET:
+	default:
+		return;
+	}
+
+	/* if it's filtered by own fmt, it has to have filter bits */
+	perf_hpp_list__for_each_format(he->hpp_list, fmt) {
+		if (check(fmt)) {
+			type_match = true;
+			break;
+		}
+	}
+
+	if (type_match) {
+		/*
+		 * If the filter is for current level entry, propagate
+		 * filter marker to parents.  The marker bit was
+		 * already set by default so it only needs to clear
+		 * non-filtered entries.
+		 */
+		if (!(he->filtered & (1 << type))) {
+			while (parent) {
+				parent->filtered &= ~(1 << type);
+				parent = parent->parent_he;
+			}
+		}
+	} else {
+		/*
+		 * If current entry doesn't have matching formats, set
+		 * filter marker for upper level entries.  it will be
+		 * cleared if its lower level entries is not filtered.
+		 *
+		 * For lower-level entries, it inherits parent's
+		 * filter bit so that lower level entries of a
+		 * non-filtered entry won't set the filter marker.
+		 */
+		if (parent == NULL)
+			he->filtered |= (1 << type);
+		else
+			he->filtered |= (parent->filtered & (1 << type));
+	}
+}
+
+static void hist_entry__apply_hierarchy_filters(struct hist_entry *he)
+{
+	hist_entry__check_and_remove_filter(he, HIST_FILTER__THREAD,
+					    check_thread_entry);
+
+	hist_entry__check_and_remove_filter(he, HIST_FILTER__DSO,
+					    perf_hpp__is_dso_entry);
+
+	hist_entry__check_and_remove_filter(he, HIST_FILTER__SYMBOL,
+					    perf_hpp__is_sym_entry);
+
+	hists__apply_filters(he->hists, he);
+}
 
 static struct hist_entry *hierarchy_insert_entry(struct hists *hists,
 						 struct rb_root *root,
 						 struct hist_entry *he,
+						 struct hist_entry *parent_he,
 						 struct perf_hpp_list *hpp_list)
 {
 	struct rb_node **p = &root->rb_node;
@@ -1125,11 +1218,13 @@ static struct hist_entry *hierarchy_insert_entry(struct hists *hists,
 	if (new == NULL)
 		return NULL;
 
-	hists__apply_filters(hists, new);
 	hists->nr_entries++;
 
 	/* save related format list for output */
 	new->hpp_list = hpp_list;
+	new->parent_he = parent_he;
+
+	hist_entry__apply_hierarchy_filters(new);
 
 	/* some fields are now passed to 'new' */
 	perf_hpp_list__for_each_sort_list(hpp_list, fmt) {
@@ -1170,14 +1265,13 @@ static int hists__hierarchy_insert_entry(struct hists *hists,
 			continue;
 
 		/* insert copy of 'he' for each fmt into the hierarchy */
-		new_he = hierarchy_insert_entry(hists, root, he, &node->hpp);
+		new_he = hierarchy_insert_entry(hists, root, he, parent, &node->hpp);
 		if (new_he == NULL) {
 			ret = -1;
 			break;
 		}
 
 		root = &new_he->hroot_in;
-		new_he->parent_he = parent;
 		new_he->depth = depth++;
 		parent = new_he;
 	}
-- 
2.7.2