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rcuscale: Dump grace-period statistics when rcu_scale_writer() stalls

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This commit adds a .stats function pointer to the rcu_scale_ops structure,
and if this is non-NULL, it is invoked after stack traces are dumped in
response to a rcu_scale_writer() stall.

Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
This commit is contained in:
Paul E. McKenney 2024-08-01 17:43:00 -07:00 committed by Neeraj Upadhyay
parent 42a8a2695c
commit 48c21c020f
1 changed files with 10 additions and 0 deletions
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10
kernel/rcu/rcuscale.c
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@ -145,6 +145,7 @@ struct rcu_scale_ops {
void (*sync)(void);
void (*exp_sync)(void);
struct task_struct *(*rso_gp_kthread)(void);
void (*stats)(void);
const char *name;
};
@ -226,6 +227,11 @@ static void srcu_scale_synchronize(void)
synchronize_srcu(srcu_ctlp);
}
static void srcu_scale_stats(void)
{
srcu_torture_stats_print(srcu_ctlp, scale_type, SCALE_FLAG);
}
static void srcu_scale_synchronize_expedited(void)
{
synchronize_srcu_expedited(srcu_ctlp);
@ -243,6 +249,7 @@ static struct rcu_scale_ops srcu_ops = {
.gp_barrier = srcu_rcu_barrier,
.sync = srcu_scale_synchronize,
.exp_sync = srcu_scale_synchronize_expedited,
.stats = srcu_scale_stats,
.name = "srcu"
};
@ -272,6 +279,7 @@ static struct rcu_scale_ops srcud_ops = {
.gp_barrier = srcu_rcu_barrier,
.sync = srcu_scale_synchronize,
.exp_sync = srcu_scale_synchronize_expedited,
.stats = srcu_scale_stats,
.name = "srcud"
};
@ -563,6 +571,8 @@ rcu_scale_writer(void *arg)
pr_info("%s: Task %ld flags writer %d:\n", __func__, me, i);
sched_show_task(writer_tasks[i]);
}
if (cur_ops->stats)
cur_ops->stats();
}
}
if (started && !alldone && i < MAX_MEAS - 1)