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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 8/8] sched: Add explicit TASK_PARKED printing
Date: Mon, 25 Sep 2017 14:07:55 +0200	[thread overview]
Message-ID: <20170925121117.338783334@infradead.org> (raw)
In-Reply-To: 20170925120747.125098571@infradead.org

[-- Attachment #1: peterz-sched-state-8.patch --]
[-- Type: text/plain, Size: 2814 bytes --]

Currently TASK_PARKED is masqueraded as TASK_INTERRUPTIBLE, give it
its own print state because it will not in fact get woken by regular
wakeups and is a long-term state.

This requires moving TASK_PARKED into the TASK_REPORT mask, and since
that latter needs to be a contiguous bitmask, we need to shuffle the
bits around a bit.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
 fs/proc/array.c              |    3 ++-
 include/linux/sched.h        |   16 +++++++---------
 include/trace/events/sched.h |    2 +-
 3 files changed, 10 insertions(+), 11 deletions(-)

--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -127,9 +127,10 @@ static const char * const task_state_arr
 	"t (tracing stop)",	/* 0x08 */
 	"X (dead)",		/* 0x10 */
 	"Z (zombie)",		/* 0x20 */
+	"P (parked)",		/* 0x40 */
 
 	/* states beyond TASK_REPORT: */
-	"I (idle)",		/* 0x40 */
+	"I (idle)",		/* 0x80 */
 };
 
 static inline const char *get_task_state(struct task_struct *tsk)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -75,10 +75,10 @@ struct task_group;
 #define EXIT_ZOMBIE			0x0020
 #define EXIT_TRACE			(EXIT_ZOMBIE | EXIT_DEAD)
 /* Used in tsk->state again: */
-#define TASK_DEAD			0x0040
-#define TASK_WAKEKILL			0x0080
-#define TASK_WAKING			0x0100
-#define TASK_PARKED			0x0200
+#define TASK_PARKED			0x0040
+#define TASK_DEAD			0x0080
+#define TASK_WAKEKILL			0x0100
+#define TASK_WAKING			0x0200
 #define TASK_NOLOAD			0x0400
 #define TASK_NEW			0x0800
 #define TASK_STATE_MAX			0x1000
@@ -97,7 +97,8 @@ struct task_group;
 /* get_task_state(): */
 #define TASK_REPORT			(TASK_RUNNING | TASK_INTERRUPTIBLE | \
 					 TASK_UNINTERRUPTIBLE | __TASK_STOPPED | \
-					 __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE)
+					 __TASK_TRACED | EXIT_DEAD | EXIT_ZOMBIE | \
+					 TASK_PARKED)
 
 #define task_is_traced(task)		((task->state & __TASK_TRACED) != 0)
 
@@ -1252,9 +1253,6 @@ static inline unsigned int __get_task_st
 
 	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;
 
@@ -1263,7 +1261,7 @@ static inline unsigned int __get_task_st
 
 static inline char __task_state_to_char(unsigned int state)
 {
-	static const char state_char[] = "RSDTtXZI";
+	static const char state_char[] = "RSDTtXZPI";
 
 	BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != sizeof(state_char) - 1);
 
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -160,7 +160,7 @@ TRACE_EVENT(sched_switch,
 		  __print_flags(__entry->prev_state & (TASK_REPORT_MAX - 1), "|",
 				{ 0x01, "S" }, { 0x02, "D" }, { 0x04, "T" },
 				{ 0x08, "t" }, { 0x10, "X" }, { 0x20, "Z" },
-				{ 0x40, "I" }) :
+				{ 0x40, "P" }, { 0x80, "I" }) :
 		  "R",
 
 		__entry->prev_state & TASK_STATE_MAX ? "+" : "",

  parent reply	other threads:[~2017-09-25 12:12 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 ` [PATCH 6/8] sched: Add explicit TASK_IDLE printing Peter Zijlstra
2017-09-25 12:07 ` [PATCH 7/8] sched: Ignore TASK_IDLE for SysRq-W Peter Zijlstra
2017-09-25 12:07 ` Peter Zijlstra [this message]
2017-09-25 13:41 ` [PATCH 0/8] sched: Rework task state printing Thomas Gleixner

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