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sched/walt: limit the cpu selected by rto_next_cpu

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rto_next_cpu can select any rd->rto_mask cpu, which may be
halted. restrict rto_next_cpu to unhalted CPUs.

Change-Id: I1c41c4c72b630d00cca080ed73609f6fdfb7143d
Signed-off-by: Stephen Dickey <quic_dickey@quicinc.com>
This commit is contained in:
Stephen Dickey 2021-11-12 16:27:21 -08:00 committed by Rishabh Bhatnagar
parent a91f190651
commit dcbd6c7246
1 changed files with 18 additions and 0 deletions
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18
kernel/sched/walt/walt.c
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@ -4225,6 +4225,23 @@ static void android_rvh_set_cpus_allowed_ptr_locked(void *unused,
}
}
static void android_rvh_rto_next_cpu(void *unused,
int rto_cpu,
struct cpumask *rto_mask,
int *cpu)
{
cpumask_t allowed_cpus;
if (unlikely(walt_disabled))
return;
if (cpu_halted(*cpu)) {
/* remove halted cpus from the valid mask, and store locally */
cpumask_andnot(&allowed_cpus, rto_mask, cpu_halt_mask);
*cpu = cpumask_next(rto_cpu, &allowed_cpus);
}
}
static void register_walt_hooks(void)
{
register_trace_android_rvh_wake_up_new_task(android_rvh_wake_up_new_task, NULL);
@ -4255,6 +4272,7 @@ static void register_walt_hooks(void)
register_trace_android_vh_dump_throttled_rt_tasks(dump_throttled_rt_tasks, NULL);
register_trace_android_rvh_set_cpus_allowed_ptr_locked(
android_rvh_set_cpus_allowed_ptr_locked, NULL);
register_trace_android_rvh_rto_next_cpu(android_rvh_rto_next_cpu, NULL);
}
atomic64_t walt_irq_work_lastq_ws;