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ioprio: move io priority from task_struct to io_context

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This is where it belongs and then it doesn't take up space for a
process that doesn't do IO.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2008-01-24 08:52:45 +01:00
parent 91525300ba
commit fd0928df98
9 changed files with 178 additions and 122 deletions
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29
fs/ioprio.c
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@ -41,18 +41,29 @@ static int set_task_ioprio(struct task_struct *task, int ioprio)
return err;
task_lock(task);
do {
ioc = task->io_context;
/* see wmb() in current_io_context() */
smp_read_barrier_depends();
if (ioc)
break;
task->ioprio = ioprio;
ioc = alloc_io_context(GFP_ATOMIC, -1);
if (!ioc) {
err = -ENOMEM;
break;
}
task->io_context = ioc;
ioc->task = task;
} while (1);
ioc = task->io_context;
/* see wmb() in current_io_context() */
smp_read_barrier_depends();
if (ioc)
if (!err) {
ioc->ioprio = ioprio;
ioc->ioprio_changed = 1;
}
task_unlock(task);
return 0;
return err;
}
asmlinkage long sys_ioprio_set(int which, int who, int ioprio)
@ -148,7 +159,9 @@ static int get_task_ioprio(struct task_struct *p)
ret = security_task_getioprio(p);
if (ret)
goto out;
ret = p->ioprio;
ret = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, IOPRIO_NORM);
if (p->io_context)
ret = p->io_context->ioprio;
out:
return ret;
}