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sched/walt: Add tracepoint to display select_task_rt fastpath

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Add tracepoint to help debug rt task placement decisions.

Change-Id: I95170b2b45adf3a614ba49d237c8ed6ca6e145aa
Signed-off-by: Shaleen Agrawal <quic_shalagra@quicinc.com>
Signed-off-by: Stephen Dickey <quic_dickey@quicinc.com>
This commit is contained in:
Shaleen Agrawal 2022-08-30 16:07:06 -07:00 committed by Sai Harshini Nimmala
parent 97bfb7d38f
commit c9410f348b
2 changed files with 40 additions and 3 deletions
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22
kernel/sched/walt/trace.h
View File

@ -1055,6 +1055,28 @@ TRACE_EVENT(sched_compute_energy,
__entry->cluster_first_cpu2, __entry->s2, __entry->m2, __entry->c2)
)
TRACE_EVENT(sched_select_task_rt,
TP_PROTO(struct task_struct *p, int fastpath),
TP_ARGS(p, fastpath),
TP_STRUCT__entry(
__field(int, pid)
__array(char, comm, TASK_COMM_LEN)
__field(int, fastpath)
),
TP_fast_assign(
__entry->pid = p->pid;
memcpy(__entry->comm, p->comm, TASK_COMM_LEN);
__entry->fastpath = fastpath;
),
TP_printk("pid=%d comm=%s fastpath=%u",
__entry->pid, __entry->comm, __entry->fastpath)
);
TRACE_EVENT(sched_task_util,
TP_PROTO(struct task_struct *p, unsigned long candidates,

21
kernel/sched/walt/walt_rt.c
View File

@ -225,6 +225,14 @@ static inline bool walt_should_honor_rt_sync(struct rq *rq, struct task_struct *
rq->rt.rt_nr_running <= 2;
}
enum rt_fastpaths {
NONE = 0,
NON_WAKEUP,
SYNC_WAKEUP,
CLUSTER_PACKING_FASTPATH,
};
static void walt_select_task_rq_rt(void *unused, struct task_struct *task, int cpu,
int sd_flag, int wake_flags, int *new_cpu)
{
@ -235,13 +243,16 @@ static void walt_select_task_rq_rt(void *unused, struct task_struct *task, int c
int ret, target = -1, this_cpu;
struct cpumask *lowest_mask;
int packing_cpu;
int fastpath = NONE;
if (unlikely(walt_disabled))
return;
/* For anything but wake ups, just return the task_cpu */
if (sd_flag != SD_BALANCE_WAKE && sd_flag != SD_BALANCE_FORK)
return;
if (sd_flag != SD_BALANCE_WAKE && sd_flag != SD_BALANCE_FORK) {
fastpath = NON_WAKEUP;
goto out;
}
this_cpu = raw_smp_processor_id();
this_cpu_rq = cpu_rq(this_cpu);
@ -252,8 +263,9 @@ static void walt_select_task_rq_rt(void *unused, struct task_struct *task, int c
if (sysctl_sched_sync_hint_enable && cpu_active(this_cpu) && !cpu_halted(this_cpu) &&
cpumask_test_cpu(this_cpu, task->cpus_ptr) &&
walt_should_honor_rt_sync(this_cpu_rq, task, sync)) {
fastpath = SYNC_WAKEUP;
*new_cpu = this_cpu;
return;
goto out;
}
*new_cpu = cpu; /* previous CPU as back up */
@ -292,6 +304,7 @@ static void walt_select_task_rq_rt(void *unused, struct task_struct *task, int c
/* create a fastpath for finding a packing cpu */
packing_cpu = walt_find_and_choose_cluster_packing_cpu(task_cpu(task), task);
if (packing_cpu >= 0) {
fastpath = CLUSTER_PACKING_FASTPATH;
*new_cpu = packing_cpu;
goto unlock;
}
@ -320,6 +333,8 @@ static void walt_select_task_rq_rt(void *unused, struct task_struct *task, int c
}
unlock:
rcu_read_unlock();
out:
trace_sched_select_task_rt(task, fastpath);
}