linux-kernel - [RFC PATCH 3/3] libtraceevent: sync with latest sched

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Date:   Tue, 25 Jul 2023 15:22:54 +0800
From:   Ze Gao <zegao2021@...il.com>
To:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, Ze Gao <zegao@...cent.com>
Subject: [RFC PATCH 3/3] libtraceevent: sync with latest sched_switch tracepoint definition

Since tracepoint sched_switch changes its reported task state type,
update the parsing logic accordingly.

Signed-off-by: Ze Gao <zegao@...cent.com>
---
 plugins/plugin_sched_switch.c | 23 +----------------------
 1 file changed, 1 insertion(+), 22 deletions(-)

diff --git a/plugins/plugin_sched_switch.c b/plugins/plugin_sched_switch.c
index 8752cae..37c1be2 100644
--- a/plugins/plugin_sched_switch.c
+++ b/plugins/plugin_sched_switch.c
@@ -9,27 +9,6 @@
 #include "event-parse.h"
 #include "trace-seq.h"
 
-static void write_state(struct trace_seq *s, int val)
-{
-	const char states[] = "SDTtZXxW";
-	int found = 0;
-	int i;
-
-	for (i = 0; i < (sizeof(states) - 1); i++) {
-		if (!(val & (1 << i)))
-			continue;
-
-		if (found)
-			trace_seq_putc(s, '|');
-
-		found = 1;
-		trace_seq_putc(s, states[i]);
-	}
-
-	if (!found)
-		trace_seq_putc(s, 'R');
-}
-
 static void write_and_save_comm(struct tep_format_field *field,
 				struct tep_record *record,
 				struct trace_seq *s, int pid)
@@ -100,7 +79,7 @@ static int sched_switch_handler(struct trace_seq *s,
 		trace_seq_printf(s, "[%d] ", (int) val);
 
 	if (tep_get_field_val(s,  event, "prev_state", record, &val, 1) == 0)
-		write_state(s, val);
+		trace_seq_putc(s, (char) val);
 
 	trace_seq_puts(s, " ==> ");
 
-- 
2.40.1