perf tools: Allow sort dimensions to be registered more than once

So that the parent sort dimension can be registered twice: once
if we add it as an explicit sort dimension (-s parent) and twice
if we request a parent filter (-p foo).

We'll have only one parent sort dimension in the end but this
allows to override the default parent filter with we gave in "-p"
option. The goal of this is to prepare to allow the use of
"-s parent" and "-p foo" at the same time, ie: sort by filtered
parent.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Sam Liao <phyomh@gmail.com>

diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index f5dba56..401e220 100644 (file)
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -260,15 +260,9 @@ int sort_dimension__add(const char *tok)
        for (i = 0; i < ARRAY_SIZE(sort_dimensions); i++) {
                struct sort_dimension *sd = &sort_dimensions[i];
 
-               if (sd->taken)
-                       continue;
-
                if (strncasecmp(tok, sd->name, strlen(tok)))
                        continue;
 
-               if (sd->entry->se_collapse)
-                       sort__need_collapse = 1;
-
                if (sd->entry == &sort_parent) {
                        int ret = regcomp(&parent_regex, parent_pattern, REG_EXTENDED);
                        if (ret) {
@@ -281,6 +275,12 @@ int sort_dimension__add(const char *tok)
                        sort__has_parent = 1;
                }
 
+               if (sd->taken)
+                       return 0;
+
+               if (sd->entry->se_collapse)
+                       sort__need_collapse = 1;
+
                if (list_empty(&hist_entry__sort_list)) {
                        if (!strcmp(sd->name, "pid"))
                                sort__first_dimension = SORT_PID;