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sched/walt: limited the dest_cpu with set_cpus_allowed_ptr_locked

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When set_cpus_allowed_ptr_locked runs, it chooses a new destination
cpu for the task based upon the new mask for the task. Unfortunately
this means that halted cpus can be included.

Register for a trace hook such that dest_cpu can be recomputed, and
a dest_cpu that is not halted, chosen.

Change-Id: I0ab072eb395bece8c0ab896d7a1008f9cf55f468
Signed-off-by: Stephen Dickey <quic_dickey@quicinc.com>
This commit is contained in:
Stephen Dickey 2021-11-12 16:27:18 -08:00 committed by Rishabh Bhatnagar
parent 80676560d2
commit a91f190651
1 changed files with 19 additions and 0 deletions
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19
kernel/sched/walt/walt.c
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@ -4208,6 +4208,23 @@ static void dump_throttled_rt_tasks(void *unused, int cpu, u64 clock,
BUG_ON(sysctl_sched_bug_on_rt_throttle);
}
static void android_rvh_set_cpus_allowed_ptr_locked(void *unused,
const struct cpumask *cpu_valid_mask,
const struct cpumask *new_mask,
unsigned int *dest_cpu)
{
cpumask_t allowed_cpus;
if (unlikely(walt_disabled))
return;
if (cpu_halted(*dest_cpu)) {
/* remove halted cpus from the valid mask, and store locally */
cpumask_andnot(&allowed_cpus, cpu_valid_mask, cpu_halt_mask);
*dest_cpu = cpumask_any_and_distribute(&allowed_cpus, new_mask);
}
}
static void register_walt_hooks(void)
{
register_trace_android_rvh_wake_up_new_task(android_rvh_wake_up_new_task, NULL);
@ -4236,6 +4253,8 @@ static void register_walt_hooks(void)
register_trace_android_rvh_build_perf_domains(android_rvh_build_perf_domains, NULL);
register_trace_cpu_frequency_limits(walt_cpu_frequency_limits, NULL);
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);
}
atomic64_t walt_irq_work_lastq_ws;