linux-kernel - [PATCH v1 07/11] perf session: Add host_env argument to perf_session_

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Message-ID: <20250527064153.149939-8-irogers@google.com>
Date: Mon, 26 May 2025 23:41:49 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, John Garry <john.g.garry@...cle.com>, 
	Will Deacon <will@...nel.org>, James Clark <james.clark@...aro.org>, 
	Mike Leach <mike.leach@...aro.org>, Leo Yan <leo.yan@...ux.dev>, 
	Charlie Jenkins <charlie@...osinc.com>, Colin Ian King <colin.i.king@...il.com>, 
	Andi Kleen <ak@...ux.intel.com>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Ravi Bangoria <ravi.bangoria@....com>, Graham Woodward <graham.woodward@....com>, 
	Ilkka Koskinen <ilkka@...amperecomputing.com>, Zhongqiu Han <quic_zhonhan@...cinc.com>, 
	Yicong Yang <yangyicong@...ilicon.com>, Howard Chu <howardchu95@...il.com>, 
	"Dr. David Alan Gilbert" <linux@...blig.org>, Levi Yun <yeoreum.yun@....com>, 
	Weilin Wang <weilin.wang@...el.com>, Michael Petlan <mpetlan@...hat.com>, 
	"Krzysztof Łopatowski" <krzysztof.m.lopatowski@...il.com>, 
	Christophe Leroy <christophe.leroy@...roup.eu>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, Chun-Tse Shao <ctshao@...gle.com>, Ben Gainey <ben.gainey@....com>, 
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v1 07/11] perf session: Add host_env argument to perf_session__new

When creating a perf_session the host perf_env may or may not want to
be used. For example, `perf top` uses a host perf_env while `perf
inject` does not. Add a host_env argument to perf_session__new so that
sessions requiring a host perf_env can pass it in. Currently if none
is specified the global perf_env variable is used, but this will
change in later patches.

Signed-off-by: Ian Rogers <irogers@...gle.com>
---
 tools/perf/builtin-inject.c | 3 ++-
 tools/perf/util/session.c   | 5 +++--
 tools/perf/util/session.h   | 5 +++--
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index 1b8c4ff39124..e6f1bf093bc3 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -2532,7 +2532,8 @@ int cmd_inject(int argc, const char **argv)
 	inject.tool.auxtrace		= perf_event__repipe_auxtrace;
 	inject.tool.dont_split_sample_group = true;
 	inject.session = __perf_session__new(&data, &inject.tool,
-					     /*trace_event_repipe=*/inject.output.is_pipe);
+					     /*trace_event_repipe=*/inject.output.is_pipe,
+					     /*host_env=*/NULL);
 
 	if (IS_ERR(inject.session)) {
 		ret = PTR_ERR(inject.session);
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index beb74d9fcc07..9b477cc73c85 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -137,7 +137,8 @@ static int ordered_events__deliver_event(struct ordered_events *oe,
 
 struct perf_session *__perf_session__new(struct perf_data *data,
 					 struct perf_tool *tool,
-					 bool trace_event_repipe)
+					 bool trace_event_repipe,
+					 struct perf_env *host_env)
 {
 	int ret = -ENOMEM;
 	struct perf_session *session = zalloc(sizeof(*session));
@@ -191,7 +192,7 @@ struct perf_session *__perf_session__new(struct perf_data *data,
 				symbol_conf.kallsyms_name = perf_data__kallsyms_name(data);
 		}
 	} else  {
-		session->machines.host.env = &perf_env;
+		session->machines.host.env = host_env ?: &perf_env;
 	}
 	if (session->evlist)
 		session->evlist->session = session;
diff --git a/tools/perf/util/session.h b/tools/perf/util/session.h
index 088868f1004a..baa59fab761b 100644
--- a/tools/perf/util/session.h
+++ b/tools/perf/util/session.h
@@ -109,12 +109,13 @@ struct perf_tool;
 
 struct perf_session *__perf_session__new(struct perf_data *data,
 					 struct perf_tool *tool,
-					 bool trace_event_repipe);
+					 bool trace_event_repipe,
+					 struct perf_env *host_env);
 
 static inline struct perf_session *perf_session__new(struct perf_data *data,
 						     struct perf_tool *tool)
 {
-	return __perf_session__new(data, tool, /*trace_event_repipe=*/false);
+	return __perf_session__new(data, tool, /*trace_event_repipe=*/false, /*host_env=*/NULL);
 }
 
 void perf_session__delete(struct perf_session *session);
-- 
2.49.0.1151.ga128411c76-goog