linux-kernel - [PATCH v2 3/7] sched: fair.h: add a new cfs_rq_tg

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Date:   Fri, 10 May 2019 12:30:09 +0100
From:   Qais Yousef <qais.yousef@....com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org,
        Pavankumar Kondeti <pkondeti@...eaurora.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Uwe Kleine-Konig <u.kleine-koenig@...gutronix.de>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Quentin Perret <quentin.perret@....com>,
        Qais Yousef <qais.yousef@....com>
Subject: [PATCH v2 3/7] sched: fair.h: add a new cfs_rq_tg_path()

The new function will be used in later patches when introducing the new
PELT tracepoints.

Signed-off-by: Qais Yousef <qais.yousef@....com>
---
 kernel/sched/fair.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/kernel/sched/fair.h b/kernel/sched/fair.h
index 2e5aefaf56de..109dd068be78 100644
--- a/kernel/sched/fair.h
+++ b/kernel/sched/fair.h
@@ -33,6 +33,18 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
 	return grp->my_q;
 }
 
+static inline void cfs_rq_tg_path(struct cfs_rq *cfs_rq, char *path, int len)
+{
+	int l = path ? len : 0;
+
+	if (cfs_rq && task_group_is_autogroup(cfs_rq->tg))
+		autogroup_path(cfs_rq->tg, path, l);
+	else if (cfs_rq && cfs_rq->tg->css.cgroup)
+		cgroup_path(cfs_rq->tg->css.cgroup, path, l);
+	else if (path)
+		strcpy(path, "(null)");
+}
+
 static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
 {
 	struct rq *rq = rq_of(cfs_rq);
@@ -175,6 +187,12 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp)
 	return NULL;
 }
 
+static inline void cfs_rq_tg_path(struct cfs_rq *cfs_rq, char *path, int len)
+{
+	if (path)
+		strcpy(path, "(null)");
+}
+
 static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
 {
 	return true;
-- 
2.17.1