[RFC PATCH v2 3/3] libtraceevent: use the new prev_state_char instead in tracepoint sched_switch
From: Ze Gao <hidden>
Date: 2023-07-26 12:16:53
Also in:
linux-perf-users, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
Since the sched_switch tracepoint introduces a new variable to report sched-out task state in symbolic char, we switch to use that instead to spare from knowing internal implementations in kernel. Signed-off-by: Ze Gao <redacted> --- plugins/plugin_sched_switch.c | 29 ++++------------------------- 1 file changed, 4 insertions(+), 25 deletions(-)
diff --git a/plugins/plugin_sched_switch.c b/plugins/plugin_sched_switch.c
index 8752cae..5dbdc28 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)
@@ -97,10 +76,10 @@ static int sched_switch_handler(struct trace_seq *s, trace_seq_printf(s, "%lld ", val); if (tep_get_field_val(s, event, "prev_prio", record, &val, 1) == 0) - trace_seq_printf(s, "[%d] ", (int) val); + trace_seq_printf(s, "[%d] ", (short) val); - if (tep_get_field_val(s, event, "prev_state", record, &val, 1) == 0) - write_state(s, val); + if (tep_get_field_val(s, event, "prev_state_char", record, &val, 1) == 0) + trace_seq_putc(s, (char) val); trace_seq_puts(s, " ==> ");
@@ -115,7 +94,7 @@ static int sched_switch_handler(struct trace_seq *s, trace_seq_printf(s, "%lld", val); if (tep_get_field_val(s, event, "next_prio", record, &val, 1) == 0) - trace_seq_printf(s, " [%d]", (int) val); + trace_seq_printf(s, " [%d]", (short) val); return 0; }
--
2.40.1