linux-kernel - [PATCH RFC v5 08/13] perf evlist: Change perf_evlist__splice_list

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Date:   Fri, 6 Nov 2020 20:35:48 +0800
From:   John Garry <john.garry@...wei.com>
To:     <acme@...nel.org>, <will@...nel.org>, <mark.rutland@....com>,
        <jolsa@...hat.com>, <irogers@...gle.com>, <leo.yan@...aro.org>,
        <peterz@...radead.org>, <mingo@...hat.com>,
        <alexander.shishkin@...ux.intel.com>, <namhyung@...nel.org>,
        <mathieu.poirier@...aro.org>
CC:     <linuxarm@...wei.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <qiangqing.zhang@....com>,
        <zhangshaokun@...ilicon.com>, <linux-imx@....com>,
        <kjain@...ux.ibm.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH RFC v5 08/13] perf evlist: Change perf_evlist__splice_list_tail() ordering

Function find_evsel_group() expects events to be ordered such that they
are grouped after their leader.

Modify perf_evlist__splice_list_tail() to guarantee this (ordering).

[Should prob also change the function name]

Signed-off-by: John Garry <john.garry@...wei.com>
---
 tools/perf/util/evlist.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 8bdf3d2c907c..b7e4e6d85d59 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -180,11 +180,22 @@ void evlist__remove(struct evlist *evlist, struct evsel *evsel)
 void perf_evlist__splice_list_tail(struct evlist *evlist,
 				   struct list_head *list)
 {
-	struct evsel *evsel, *temp;
+	while (!list_empty(list)) {
+		struct evsel *evsel, *temp, *leader = NULL;
 
-	__evlist__for_each_entry_safe(list, temp, evsel) {
-		list_del_init(&evsel->core.node);
-		evlist__add(evlist, evsel);
+		__evlist__for_each_entry_safe(list, temp, evsel) {
+			list_del_init(&evsel->core.node);
+			evlist__add(evlist, evsel);
+			leader = evsel;
+			break;
+		}
+
+		__evlist__for_each_entry_safe(list, temp, evsel) {
+			if (evsel->leader == leader) {
+				list_del_init(&evsel->core.node);
+				evlist__add(evlist, evsel);
+			}
+		}
 	}
 }
 
-- 
2.26.2