On Sat, Aug 06, 2011 at 12:31:21PM +0530, Rajat Sharma wrote:
> Hi All,
>
> What is the difference between io_schedule() and schedule(), is
> io_schedule() more restrictive to shedule only I/O bound processes or
> it just favours I/O bound processes. Any documentation link would be
> great help.
Have you even looked at the source code?
>From kernel/sched.c +5721:
/*
* This task is about to go to sleep on IO. Increment rq->nr_iowait so
* that process accounting knows that this is a task in IO wait state.
*/
void __sched io_schedule(void)
{
struct rq *rq = raw_rq();
delayacct_blkio_start();
atomic_inc(&rq->nr_iowait);
blk_flush_plug(current);
current->in_iowait = 1;
schedule();
current->in_iowait = 0;
atomic_dec(&rq->nr_iowait);
delayacct_blkio_end();
}
EXPORT_SYMBOL(io_schedule);
HTH,
Jonathan Neuschäfer
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