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Date: Tue, 4 Jun 2019 12:14:55 +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 v3 2/6] sched: add a new sched_trace_*() helper functions
The new functions allow modules to access internal data structures of
unexported struct cfs_rq and struct rq to extract important information
from the tracepoints to be introduced in later patches.
While at it fix alphabetical order of struct declarations in sched.h
Signed-off-by: Qais Yousef <qais.yousef@....com>
---
include/linux/sched.h | 16 ++++++-
kernel/sched/fair.c | 99 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 114 insertions(+), 1 deletion(-)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 11837410690f..5079ab584066 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -35,6 +35,7 @@ struct audit_context;
struct backing_dev_info;
struct bio_list;
struct blk_plug;
+struct capture_control;
struct cfs_rq;
struct fs_struct;
struct futex_pi_state;
@@ -47,8 +48,9 @@ struct pid_namespace;
struct pipe_inode_info;
struct rcu_node;
struct reclaim_state;
-struct capture_control;
struct robust_list_head;
+struct root_domain;
+struct rq;
struct sched_attr;
struct sched_param;
struct seq_file;
@@ -1919,4 +1921,16 @@ static inline void rseq_syscall(struct pt_regs *regs)
#endif
+const struct sched_avg *sched_trace_cfs_rq_avg(struct cfs_rq *cfs_rq);
+char *sched_trace_cfs_rq_path(struct cfs_rq *cfs_rq, char *str, int len);
+int sched_trace_cfs_rq_cpu(struct cfs_rq *cfs_rq);
+
+const struct sched_avg *sched_trace_rq_avg_rt(struct rq *rq);
+const struct sched_avg *sched_trace_rq_avg_dl(struct rq *rq);
+const struct sched_avg *sched_trace_rq_avg_irq(struct rq *rq);
+
+int sched_trace_rq_cpu(struct rq *rq);
+
+const struct cpumask *sched_trace_rd_span(struct root_domain *rd);
+
#endif
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f35930f5e528..18c89ebadfc7 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -275,6 +275,19 @@ 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)
+{
+ if (!path)
+ return;
+
+ if (cfs_rq && task_group_is_autogroup(cfs_rq->tg))
+ autogroup_path(cfs_rq->tg, path, len);
+ else if (cfs_rq && cfs_rq->tg->css.cgroup)
+ cgroup_path(cfs_rq->tg->css.cgroup, path, len);
+ else
+ strlcpy(path, "(null)", len);
+}
+
static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
struct rq *rq = rq_of(cfs_rq);
@@ -449,6 +462,12 @@ 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)
+ strlcpy(path, "(null)", len);
+}
+
static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)
{
return true;
@@ -10737,3 +10756,83 @@ __init void init_sched_fair_class(void)
#endif /* SMP */
}
+
+/*
+ * Helper functions to facilitate extracting info from tracepoints.
+ */
+
+const struct sched_avg *sched_trace_cfs_rq_avg(struct cfs_rq *cfs_rq)
+{
+#ifdef CONFIG_SMP
+ return cfs_rq ? &cfs_rq->avg : NULL;
+#else
+ return NULL;
+#endif
+}
+EXPORT_SYMBOL_GPL(sched_trace_cfs_rq_avg);
+
+char *sched_trace_cfs_rq_path(struct cfs_rq *cfs_rq, char *str, int len)
+{
+ if (!cfs_rq) {
+ if (str)
+ strlcpy(str, "(null)", len);
+ else
+ return NULL;
+ }
+
+ cfs_rq_tg_path(cfs_rq, str, len);
+ return str;
+}
+EXPORT_SYMBOL_GPL(sched_trace_cfs_rq_path);
+
+int sched_trace_cfs_rq_cpu(struct cfs_rq *cfs_rq)
+{
+ return cfs_rq ? cpu_of(rq_of(cfs_rq)) : -1;
+}
+EXPORT_SYMBOL_GPL(sched_trace_cfs_rq_cpu);
+
+const struct sched_avg *sched_trace_rq_avg_rt(struct rq *rq)
+{
+#ifdef CONFIG_SMP
+ return rq ? &rq->avg_rt : NULL;
+#else
+ return NULL;
+#endif
+}
+EXPORT_SYMBOL_GPL(sched_trace_rq_avg_rt);
+
+const struct sched_avg *sched_trace_rq_avg_dl(struct rq *rq)
+{
+#ifdef CONFIG_SMP
+ return rq ? &rq->avg_dl : NULL;
+#else
+ return NULL;
+#endif
+}
+EXPORT_SYMBOL_GPL(sched_trace_rq_avg_dl);
+
+const struct sched_avg *sched_trace_rq_avg_irq(struct rq *rq)
+{
+#if defined(CONFIG_SMP) && defined(CONFIG_HAVE_SCHED_AVG_IRQ)
+ return rq ? &rq->avg_irq : NULL;
+#else
+ return NULL;
+#endif
+}
+EXPORT_SYMBOL_GPL(sched_trace_rq_avg_irq);
+
+int sched_trace_rq_cpu(struct rq *rq)
+{
+ return rq ? cpu_of(rq) : -1;
+}
+EXPORT_SYMBOL_GPL(sched_trace_rq_cpu);
+
+const struct cpumask *sched_trace_rd_span(struct root_domain *rd)
+{
+#ifdef CONFIG_SMP
+ return rd ? rd->span : NULL;
+#else
+ return NULL;
+#endif
+}
+EXPORT_SYMBOL_GPL(sched_trace_rd_span);
--
2.17.1
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