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 1/8] sched: Consistent task-state printing
Date: Mon, 25 Sep 2017 14:07:48 +0200 [thread overview]
Message-ID: <20170925121116.927982688@infradead.org> (raw)
In-Reply-To: 20170925120747.125098571@infradead.org
[-- Attachment #1: peterz-sched-state-1.patch --]
[-- Type: text/plain, Size: 2397 bytes --]
Currently get_task_state() and task_state_to_char() report different
states, create a number of common helpers and unify the reported state
space.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
---
fs/proc/array.c | 15 ++-------------
include/linux/sched.h | 26 +++++++++++++++++++-------
2 files changed, 21 insertions(+), 20 deletions(-)
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -129,19 +129,8 @@ static const char * const task_state_arr
static inline const char *get_task_state(struct task_struct *tsk)
{
- unsigned int state = (tsk->state | tsk->exit_state) & TASK_REPORT;
-
- /*
- * Parked tasks do not run; they sit in __kthread_parkme().
- * Without this check, we would report them as running, which is
- * clearly wrong, so we report them as sleeping instead.
- */
- if (tsk->state == TASK_PARKED)
- state = TASK_INTERRUPTIBLE;
-
- BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != ARRAY_SIZE(task_state_array)-1);
-
- return task_state_array[fls(state)];
+ BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != ARRAY_SIZE(task_state_array) - 1);
+ return task_state_array[__get_task_state(tsk)];
}
static inline int get_task_umask(struct task_struct *tsk)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1244,17 +1244,29 @@ static inline pid_t task_pgrp_nr(struct
return task_pgrp_nr_ns(tsk, &init_pid_ns);
}
-static inline char task_state_to_char(struct task_struct *task)
+static inline unsigned int __get_task_state(struct task_struct *tsk)
{
- const char stat_nam[] = TASK_STATE_TO_CHAR_STR;
- unsigned long state = task->state;
+ unsigned int tsk_state = READ_ONCE(tsk->state);
+ unsigned int state = (tsk_state | tsk->exit_state) & TASK_REPORT;
- state = state ? __ffs(state) + 1 : 0;
+ if (tsk_state == TASK_PARKED)
+ state = TASK_INTERRUPTIBLE;
- /* Make sure the string lines up properly with the number of task states: */
- BUILD_BUG_ON(sizeof(TASK_STATE_TO_CHAR_STR)-1 != ilog2(TASK_STATE_MAX)+1);
+ return fls(state);
+}
+
+static inline char __task_state_to_char(unsigned int state)
+{
+ static const char state_char[] = "RSDTtXZ";
+
+ BUILD_BUG_ON(1 + ilog2(TASK_REPORT) != sizeof(state_char) - 2);
- return state < sizeof(stat_nam) - 1 ? stat_nam[state] : '?';
+ return state_char[state];
+}
+
+static inline char task_state_to_char(struct task_struct *tsk)
+{
+ return __task_state_to_char(__get_task_state(tsk));
}
/**
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 ` Peter Zijlstra [this message]
2017-09-25 20:01 ` [PATCH 1/8] sched: Consistent task-state printing 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 ` [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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