LKML Archive on
 help / color / Atom feed
From: Sebastian Andrzej Siewior <>
Cc: Peter Zijlstra <>,
	Ingo Molnar <>, Jens Axboe <>,,
	Sebastian Andrzej Siewior <>
Subject: [PATCH 1/2] sched/rt: Add a helper to test for a RT task
Date: Wed,  4 Oct 2017 17:49:00 +0200
Message-ID: <> (raw)

This helper returns true if a task has elevated priority which is true
for RT tasks (SCHED_RR and SCHED_FIFO) and also for SCHED_DEADLINE.
A task which runs at RT priority due to PI-boosting is not considered as
one with elevated priority.

Signed-off-by: Sebastian Andrzej Siewior <>
 include/linux/sched/rt.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/sched/rt.h b/include/linux/sched/rt.h
index f93329aba31a..30a86b8178f8 100644
--- a/include/linux/sched/rt.h
+++ b/include/linux/sched/rt.h
@@ -17,6 +17,17 @@ static inline int rt_task(struct task_struct *p)
 	return rt_prio(p->prio);
+static inline bool task_is_elevated(struct task_struct *tsk)
+	int policy = tsk->policy;
+	if (policy == SCHED_FIFO || policy == SCHED_RR)
+		return true;
+	if (policy == SCHED_DEADLINE)
+		return true;
+	return false;
  * Must hold either p->pi_lock or task_rq(p)->lock.

             reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-04 15:49 Sebastian Andrzej Siewior [this message]
2017-10-04 15:49 ` [PATCH 2/2] block/ioprio: use a helper to check for RT prio Sebastian Andrzej Siewior
2017-10-10 11:01   ` [tip:sched/core] block/ioprio: Use " tip-bot for Sebastian Andrzej Siewior
2017-10-06  8:19 ` [PATCH 1/2] sched/rt: Add a helper to test for a RT task Peter Zijlstra
2017-10-06  8:51   ` Sebastian Andrzej Siewior
2017-10-10 11:01 ` [tip:sched/core] " tip-bot for Sebastian Andrzej Siewior

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on

Archives are clonable:
	git clone --mirror lkml/git/0.git
	git clone --mirror lkml/git/1.git
	git clone --mirror lkml/git/2.git
	git clone --mirror lkml/git/3.git
	git clone --mirror lkml/git/4.git
	git clone --mirror lkml/git/5.git
	git clone --mirror lkml/git/6.git
	git clone --mirror lkml/git/7.git
	git clone --mirror lkml/git/8.git
	git clone --mirror lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ \
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone