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sched/debug: Add a new sched_trace_*() helper functions

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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@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Pavankumar Kondeti <pkondeti@codeaurora.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Perret <quentin.perret@arm.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Uwe Kleine-Konig <u.kleine-koenig@pengutronix.de>
Link: https://lkml.kernel.org/r/20190604111459.2862-3-qais.yousef@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Qais Yousef 2019-06-04 12:14:55 +01:00 committed by Ingo Molnar
parent 9ba5090aec
commit 3c93a0c04d
2 changed files with 114 additions and 1 deletions
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16
include/linux/sched.h
View File

@ -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;
@ -1920,4 +1922,16 @@ 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

99
kernel/sched/fair.c
View File

@ -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;
@ -10408,3 +10427,83 @@ __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);