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Commit 3c93a0c0 authored by Qais Yousef's avatar Qais Yousef Committed by Ingo Molnar
Browse files

sched/debug: 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: default avatarQais Yousef <qais.yousef@arm.com>
Signed-off-by: default avatarPeter 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: default avatarIngo Molnar <mingo@kernel.org>
parent 9ba5090a

include/linux/sched.h

+15 −1
Original line number Original line Diff line number Diff line
@@ -35,6 +35,7 @@ struct audit_context; 
struct backing_dev_info;

struct backing_dev_info;

struct bio_list;

struct bio_list;

struct blk_plug;

struct blk_plug;

struct capture_control;

struct cfs_rq;

struct cfs_rq;

struct fs_struct;

struct fs_struct;

struct futex_pi_state;

struct futex_pi_state;
@@ -47,8 +48,9 @@ struct pid_namespace; 
struct pipe_inode_info;

struct pipe_inode_info;

struct rcu_node;

struct rcu_node;

struct reclaim_state;

struct reclaim_state;

struct capture_control;

struct robust_list_head;

struct robust_list_head;

struct root_domain;

struct rq;

struct sched_attr;

struct sched_attr;

struct sched_param;

struct sched_param;

struct seq_file;

struct seq_file;
@@ -1920,4 +1922,16 @@ static inline void rseq_syscall(struct pt_regs *regs) 




#endif

#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
 
#endif

kernel/sched/fair.c

+99 −0
Original line number Original line Diff line number Diff line
@@ -275,6 +275,19 @@ static inline struct cfs_rq *group_cfs_rq(struct sched_entity *grp) 
	return grp->my_q;

	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)

static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)

{

{

	struct rq *rq = rq_of(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;

	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)

static inline bool list_add_leaf_cfs_rq(struct cfs_rq *cfs_rq)

{

{

	return true;

	return true;
@@ -10408,3 +10427,83 @@ __init void init_sched_fair_class(void) 
#endif /* SMP */

#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);