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Message-ID: <20210319123527.173883-1-yangjihong1@huawei.com>
Date: Fri, 19 Mar 2021 20:35:27 +0800
From: Yang Jihong <yangjihong1@...wei.com>
To: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
<mark.rutland@....com>, <alexander.shishkin@...ux.intel.com>,
<jolsa@...hat.com>, <namhyung@...nel.org>,
<yao.jin@...ux.intel.com>, <gustavoars@...nel.org>,
<mliska@...e.cz>, <linux-kernel@...r.kernel.org>
CC: <yangjihong1@...wei.com>, <zhangjinhao2@...wei.com>
Subject: [PATCH v7] perf annotate: Fix sample events lost in stdio mode
In hist__find_annotations function, since different hist_entry may point to same
symbol, we free notes->src to signal already processed this symbol in stdio mode;
when annotate, entry will skipped if notes->src is NULL to avoid repeated output.
However, there is a problem, for example, run the following command:
# perf record -e branch-misses -e branch-instructions -a sleep 1
perf.data file contains different types of sample event.
If the same IP sample event exists in branch-misses and branch-instructions,
this event uses the same symbol. When annotate branch-misses events, notes->src
corresponding to this event is set to null, as a result, when annotate
branch-instructions events, this event is skipped and no annotate is output.
Solution of this patch is to remove zfree in hists__find_annotations and
change sort order to "dso,symbol" to avoid duplicate output when different
processes correspond to the same symbol.
Signed-off-by: Yang Jihong <yangjihong1@...wei.com>
---
Changes since v6:
- Remove separate setup_sorting() for branch mode.
Changes since v5:
- Add Signed-off-by tag.
Changes since v4:
- Use the same sort key "dso,symbol" in branch stack mode.
Changes since v3:
- Modify the first line of comments.
Changes since v2:
- Remove zfree in hists__find_annotations.
- Change sort order to avoid duplicate output.
Changes since v1:
- Change processed flag variable from u8 to bool.
tools/perf/builtin-annotate.c | 29 +++++++++++++++--------------
1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/tools/perf/builtin-annotate.c b/tools/perf/builtin-annotate.c
index a23ba6bb99b6..795c2ac7fcd1 100644
--- a/tools/perf/builtin-annotate.c
+++ b/tools/perf/builtin-annotate.c
@@ -374,13 +374,6 @@ static void hists__find_annotations(struct hists *hists,
} else {
hist_entry__tty_annotate(he, evsel, ann);
nd = rb_next(nd);
- /*
- * Since we have a hist_entry per IP for the same
- * symbol, free he->ms.sym->src to signal we already
- * processed this symbol.
- */
- zfree(¬es->src->cycles_hist);
- zfree(¬es->src);
}
}
}
@@ -619,14 +612,22 @@ int cmd_annotate(int argc, const char **argv)
setup_browser(true);
- if ((use_browser == 1 || annotate.use_stdio2) && annotate.has_br_stack) {
+ /*
+ * Events of different processes may correspond to the same
+ * symbol, we do not care about the processes in annotate,
+ * set sort order to avoid repeated output.
+ */
+ sort_order = "dso,symbol";
+
+ /*
+ * Set SORT_MODE__BRANCH so that annotate display IPC/Cycle
+ * if branch info is in perf data in TUI mode.
+ */
+ if ((use_browser == 1 || annotate.use_stdio2) && annotate.has_br_stack)
sort__mode = SORT_MODE__BRANCH;
- if (setup_sorting(annotate.session->evlist) < 0)
- usage_with_options(annotate_usage, options);
- } else {
- if (setup_sorting(NULL) < 0)
- usage_with_options(annotate_usage, options);
- }
+
+ if (setup_sorting(NULL) < 0)
+ usage_with_options(annotate_usage, options);
ret = __cmd_annotate(&annotate);
--
2.30.GIT
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