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Subject[RFC PATCH 07/11] sched rename struct task in_iowait field to sched_in_iowait
Rename task struct in_iowait to sched_in_iowait, since it's only
scheduler-specific. Extracted from a patch originally from Peter Zijlstra.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
include/linux/sched.h | 7 +++----
kernel/sched.c | 8 ++++----
kernel/sched_fair.c | 2 +-
3 files changed, 8 insertions(+), 9 deletions(-)

Index: linux-2.6-lttng.git/include/linux/sched.h
===================================================================
--- linux-2.6-lttng.git.orig/include/linux/sched.h
+++ linux-2.6-lttng.git/include/linux/sched.h
@@ -1233,11 +1233,10 @@ struct task_struct {
unsigned did_exec:1;
unsigned in_execve:1; /* Tell the LSMs that the process is doing an
* execve */
- unsigned in_iowait:1;

-
- /* Revert to default priority/policy when forking */
- unsigned sched_reset_on_fork:1;
+ unsigned sched_in_iowait:1; /* Called io_schedule() */
+ unsigned sched_reset_on_fork:1; /* Revert to default
+ * priority/policy on fork */

pid_t pid;
pid_t tgid;
Index: linux-2.6-lttng.git/kernel/sched.c
===================================================================
--- linux-2.6-lttng.git.orig/kernel/sched.c
+++ linux-2.6-lttng.git/kernel/sched.c
@@ -4957,9 +4957,9 @@ void __sched io_schedule(void)

delayacct_blkio_start();
atomic_inc(&rq->nr_iowait);
- current->in_iowait = 1;
+ current->sched_in_iowait = 1;
schedule();
- current->in_iowait = 0;
+ current->sched_in_iowait = 0;
atomic_dec(&rq->nr_iowait);
delayacct_blkio_end();
}
@@ -4972,9 +4972,9 @@ long __sched io_schedule_timeout(long ti

delayacct_blkio_start();
atomic_inc(&rq->nr_iowait);
- current->in_iowait = 1;
+ current->sched_in_iowait = 1;
ret = schedule_timeout(timeout);
- current->in_iowait = 0;
+ current->sched_in_iowait = 0;
atomic_dec(&rq->nr_iowait);
delayacct_blkio_end();
return ret;
Index: linux-2.6-lttng.git/kernel/sched_fair.c
===================================================================
--- linux-2.6-lttng.git.orig/kernel/sched_fair.c
+++ linux-2.6-lttng.git/kernel/sched_fair.c
@@ -693,7 +693,7 @@ static void enqueue_sleeper(struct cfs_r
se->statistics.sum_sleep_runtime += delta;

if (tsk) {
- if (tsk->in_iowait) {
+ if (tsk->sched_in_iowait) {
se->statistics.iowait_sum += delta;
se->statistics.iowait_count++;
trace_sched_stat_iowait(tsk, delta);


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