From: Peter Zijlstra <peterz@infradead.org>
To: mingo@kernel.org, markus@trippelsdorf.de, rostedt@goodmis.org
Cc: tj@kernel.org, mcgrof@kernel.org, ebiederm@xmission.com,
paulmck@linux.vnet.ibm.com, torvalds@linux-foundation.org,
tglx@linutronix.de, peterz@infradead.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 6/8] sched: Add explicit TASK_IDLE printing
Date: Mon, 25 Sep 2017 14:07:53 +0200 [thread overview]
Message-ID: <20170925121117.224552932@infradead.org> (raw)
In-Reply-To: 20170925120747.125098571@infradead.org
[-- Attachment #1: peterz-sched-state-6.patch --]
[-- Type: text/plain, Size: 3264 bytes --]
Markus reported that kthreads that idle using TASK_IDLE instead of
TASK_INTERRUPTIBLE are reported in as TASK_UNINTERRUPTIBLE and things
like htop mark those red.
This is undesirable, so add an explicit state for TASK_IDLE.
Reported-by: Markus Trippelsdorf <markus@trippelsdorf.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
fs/proc/array.c | 21 +++++++++++++--------
include/linux/sched.h | 12 ++++++++++--
include/trace/events/sched.h | 7 ++++---
3 files changed, 27 insertions(+), 13 deletions(-)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -118,18 +118,23 @@ static inline void task_name(struct seq_
* simple bit tests.
*/
static const char * const task_state_array[] = {
- "R (running)", /* 0 */
- "S (sleeping)", /* 1 */
- "D (disk sleep)", /* 2 */
- "T (stopped)", /* 4 */
- "t (tracing stop)", /* 8 */
- "X (dead)", /* 16 */
- "Z (zombie)", /* 32 */
+
+ /* states in TASK_REPORT: */
+ "R (running)", /* 0x00 */
+ "S (sleeping)", /* 0x01 */
+ "D (disk sleep)", /* 0x02 */
+ "T (stopped)", /* 0x04 */
+ "t (tracing stop)", /* 0x08 */
+ "X (dead)", /* 0x10 */
+ "Z (zombie)", /* 0x20 */
+
+ /* states beyond TASK_REPORT: */
+ "I (idle)", /* 0x40 */
};
static inline const char *get_task_state(struct task_struct *tsk)
{
- BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != ARRAY_SIZE(task_state_array) - 1);
+ BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));
return task_state_array[__get_task_state(tsk)];
}
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1242,22 +1242,30 @@ static inline pid_t task_pgrp_nr(struct
return task_pgrp_nr_ns(tsk, &init_pid_ns);
}
+#define TASK_REPORT_IDLE (TASK_REPORT + 1)
+#define TASK_REPORT_MAX (TASK_REPORT_IDLE << 1)
+
static inline unsigned int __get_task_state(struct task_struct *tsk)
{
unsigned int tsk_state = READ_ONCE(tsk->state);
unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT;
+ BUILD_BUG_ON_NOT_POWER_OF_2(TASK_REPORT_MAX);
+
if (tsk_state == TASK_PARKED)
state = TASK_INTERRUPTIBLE;
+ if (tsk_state == TASK_IDLE)
+ state = TASK_REPORT_IDLE;
+
return fls(state);
}
static inline char __task_state_to_char(unsigned int state)
{
- static const char state_char[] = "RSDTtXZ";
+ static const char state_char[] = "RSDTtXZI";
- BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != sizeof(state_char) - 2);
+ BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1);
return state_char[state];
}
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -156,10 +156,11 @@ TRACE_EVENT(sched_switch,
TP_printk("prev_comm=%s prev_pid=%d prev_prio=%d prev_state=%s%s ==> next_comm=%s next_pid=%d next_prio=%d",
__entry->prev_comm, __entry->prev_pid, __entry->prev_prio,
- (__entry->prev_state & TASK_REPORT) ?
- __print_flags(__entry->prev_state & TASK_REPORT, "|",
+ (__entry->prev_state & (TASK_REPORT_MAX - 1)) ?
+ __print_flags(__entry->prev_state & (TASK_REPORT_MAX - 1), "|",
{ 0x01, "S" }, { 0x02, "D" }, { 0x04, "T" },
- { 0x08, "t" }, { 0x10, "X" }, { 0x20, "Z" }) :
+ { 0x08, "t" }, { 0x10, "X" }, { 0x20, "Z" },
+ { 0x40, "I" }) :
"R",
__entry->prev_state & TASK_STATE_MAX ? "+" : "",
next prev parent reply other threads:[~2017-09-25 12:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-25 12:07 [PATCH 0/8] sched: Rework task state printing Peter Zijlstra
2017-09-25 12:07 ` [PATCH 1/8] sched: Consistent task-state printing Peter Zijlstra
2017-09-25 20:01 ` Steven Rostedt
2017-09-29 11:50 ` Peter Zijlstra
2017-09-29 13:00 ` Steven Rostedt
2017-10-10 10:55 ` [tip:sched/core] sched/debug: Rename task-state printing helpers tip-bot for Peter Zijlstra
2017-09-25 12:07 ` [PATCH 2/8] sched: Convert TASK_state to hex Peter Zijlstra
2017-09-25 12:07 ` [PATCH 3/8] sched/debug: Remove unused variable Peter Zijlstra
2017-09-25 12:07 ` [PATCH 4/8] sched/trace: Fix trace_sched_switch task-state printing Peter Zijlstra
2017-09-25 12:07 ` [PATCH 5/8] sched/trace: Use common task-state helpers Peter Zijlstra
2017-09-25 12:07 ` Peter Zijlstra [this message]
2017-09-25 12:07 ` [PATCH 7/8] sched: Ignore TASK_IDLE for SysRq-W Peter Zijlstra
2017-09-25 12:07 ` [PATCH 8/8] sched: Add explicit TASK_PARKED printing Peter Zijlstra
2017-09-25 13:41 ` [PATCH 0/8] sched: Rework task state printing Thomas Gleixner
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