linux-kernel - [tip:perf/urgent] perf hists: Reimplement hists__has

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Date:   Wed, 13 Jun 2018 23:20:42 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     namhyung@...nel.org, dsahern@...il.com, jolsa@...nel.org,
        tglx@...utronix.de, hpa@...or.com, wangnan0@...wei.com,
        linux-kernel@...r.kernel.org, acme@...hat.com,
        yao.jin@...ux.intel.com, mingo@...nel.org, adrian.hunter@...el.com
Subject: [tip:perf/urgent] perf hists: Reimplement hists__has_callchains()

Commit-ID:  c9d366287042489090da0391318df528bdce9941
Gitweb:     https://git.kernel.org/tip/c9d366287042489090da0391318df528bdce9941
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Thu, 7 Jun 2018 14:42:27 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Thu, 7 Jun 2018 14:42:27 -0300

perf hists: Reimplement hists__has_callchains()

There are places where we have only access to struct hists and need to
know if any of its hist_entries has callchains, like when drawing
headers for the various output modes (stdio, TUI, etc), so, when adding
a new hist_entry, check if it has callchains, storing this info for
later use by hists__has_callchains().

This reimplementation is necessary because not always a 'struct hists'
is allocated together with a 'struct perf evsel', so we can't go from
'hists' to 'perf_event_attr.sample_type & PERF_SAMPLE_CALLCHAIN'.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Wang Nan <wangnan0@...wei.com>
Link: https://lkml.kernel.org/n/tip-hg5g7yddjio3ljwyqnnaj5dt@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/hist.c | 6 ++++--
 tools/perf/util/hist.h | 4 ++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 0441a92b855f..828cb9794c76 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -621,9 +621,11 @@ __hists__add_entry(struct hists *hists,
 		.raw_data = sample->raw_data,
 		.raw_size = sample->raw_size,
 		.ops = ops,
-	};
+	}, *he = hists__findnew_entry(hists, &entry, al, sample_self);
 
-	return hists__findnew_entry(hists, &entry, al, sample_self);
+	if (!hists->has_callchains && he && he->callchain_size != 0)
+		hists->has_callchains = true;
+	return he;
 }
 
 struct hist_entry *hists__add_entry(struct hists *hists,
diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h
index 06607c434949..73049f7f0f60 100644
--- a/tools/perf/util/hist.h
+++ b/tools/perf/util/hist.h
@@ -85,6 +85,7 @@ struct hists {
 	struct events_stats	stats;
 	u64			event_stream;
 	u16			col_len[HISTC_NR_COLS];
+	bool			has_callchains;
 	int			socket_filter;
 	struct perf_hpp_list	*hpp_list;
 	struct list_head	hpp_formats;
@@ -222,8 +223,7 @@ static inline struct hists *evsel__hists(struct perf_evsel *evsel)
 
 static __pure inline bool hists__has_callchains(struct hists *hists)
 {
-	const struct perf_evsel *evsel = hists_to_evsel(hists);
-	return evsel__has_callchain(evsel);
+	return hists->has_callchains;
 }
 
 int hists__init(void);