Re: Query about the realtime processes scheduling.
On Thu, Aug 18, 2011 at 14:21, nilesh wrote: > Please ignore the post. > I should have looked into the code before posting the query. It looks > like the bonus/penalty is only for non-realtime tasks. Correct. Most (if not all) realtime priority scheduling is done in FIFO style and their priority is static. -- regards, Mulyadi Santosa Freelance Linux trainer and consultant blog: the-hydra.blogspot.com training: mulyaditraining.blogspot.com ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
Re: Query about the realtime processes scheduling.
On Thursday 18 August 2011 12:18 PM, nilesh wrote:
> Hi,
>
> I am not too familiar with Linux scheduler. What I could understand
> theoretically is - the interactive processes get advantage (-5) in priority.
> And hence the effective priority is higher.
>
> Query:
> Is this true for realtime processes ( with SCHED_FIFO/SCHED_RR policy)
> as well? Could the realtime processes be I/O bound or interactive?
>
Please ignore the post.
I should have looked into the code before posting the query. It looks
like the bonus/penalty is only for non-realtime tasks.
2101static int effective_prio(struct task_struct *p)
2102{
2103p->normal_prio = normal_prio(p);
2104/*
2105 * If we are RT tasks or we were boosted to RT priority,
2106 * keep the priority unchanged. Otherwise, update priority
2107 * to the normal priority:
2108 */
2109if (!rt_prio(p->prio))
2110return p->normal_prio;
2111return p->prio;
2112}
2113
--
Thanks,
Nilesh
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Query about the realtime processes scheduling.
Hi, I am not too familiar with Linux scheduler. What I could understand theoretically is - the interactive processes get advantage (-5) in priority. And hence the effective priority is higher. Query: Is this true for realtime processes ( with SCHED_FIFO/SCHED_RR policy) as well? Could the realtime processes be I/O bound or interactive? -- Thanks, Nilesh ___ Kernelnewbies mailing list Kernelnewbies@kernelnewbies.org http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
