Sometimes "ps -m" options cannot display all processes with timestamp value.
crash> ps -m
ps: last-run timestamps do not exist in this kernel
Usage:
ps [-k|-u|-G] [-s] [-p|-c|-t|-[l|m][-C cpu]|-a|-g|-r|-S]
[pid | task | command] ...
Enter "help ps" for details.
This is because output of 'ps -m' depends on task_struct.sched_info.last_arrival.
Without CONFIG_SCHED_STAT or CONFIG_SCHED_INFO, 'sched_info.last_arrival' field
is not included in task_struct.
So we make 'ps -m' option to access 'exec_start' field of sched_entity.
where 'exec_start' is task_struct.se.exec_start.
With this patch, "ps -m" option works well without CONFIG_SCHED_STAT or
CONFIG_SCHED_INFO.
The history of CONFIG_SCHED_INFO and CONFIG_SCHED_STAT is as below;
- CONFIG_SCHED_INFO: KERNEL_VERSION >= LINUX(4,2,0)
- CONFIG_SCHED_STAT: KERNEL_VERSION < LINUX(4,2,0)
Signed-off-by: Austin Kim <austindh.kim@xxxxxxxxx>
---
task.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/task.c b/task.c
index e6fde74..55e2312 100644
--- a/task.c
+++ b/task.c
@@ -3565,7 +3565,8 @@ cmd_ps(void)
case 'm':
if (INVALID_MEMBER(task_struct_last_run) &&
INVALID_MEMBER(task_struct_timestamp) &&
- INVALID_MEMBER(sched_info_last_arrival)) {
+ INVALID_MEMBER(sched_info_last_arrival) &&
+ INVALID_MEMBER(se_exec_start)) {
error(INFO,
"last-run timestamps do not exist in this kernel\n");
argerrs++;
--
2.20.1
--
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