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ANDROID: sched: update is_cpu_allowed tracehook

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Currently, the trace hook for is_cpu_allowed only executes if the
cpu is not a kthread. Modules need to be able to reject cpus
regardless of whether the task is a kthread or not. Modules also
need to have the flexibility to execute, or not, the remainder of
is_cpu_allowed.

Move the tracepoint for is_cpu_allowed so that it is invoked
regardless of task's kthread status, but do not interfere with
per-cpu-kthread cpu assignment.

Bug: 222550772
Change-Id: Ide48a82a33129448bb22be28814267b0b76535a2
Signed-off-by: Stephen Dickey <quic_dickey@quicinc.com>
This commit is contained in:
Stephen Dickey
2022-03-02 16:46:49 -08:00
committed by Carlos Llamas
parent 16327a1367
commit 4345c3db84
1 changed files with 8 additions and 8 deletions
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16
kernel/sched/core.c
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@@ -2228,20 +2228,20 @@ static inline bool is_cpu_allowed(struct task_struct *p, int cpu)
if (is_migration_disabled(p))
return cpu_online(cpu);
/* check for all cases */
trace_android_rvh_is_cpu_allowed(cpu, &allowed);
/* Non kernel threads are not allowed during either online or offline. */
if (!(p->flags & PF_KTHREAD)) {
if (cpu_active(cpu) && task_cpu_possible(cpu, p)) {
trace_android_rvh_is_cpu_allowed(cpu, &allowed);
return allowed;
} else {
return false;
}
}
if (!(p->flags & PF_KTHREAD))
return cpu_active(cpu) && task_cpu_possible(cpu, p) && allowed;
/* KTHREAD_IS_PER_CPU is always allowed. */
if (kthread_is_per_cpu(p))
return cpu_online(cpu);
if (!allowed)
return false;
/* Regular kernel threads don't get to stay during offline. */
if (cpu_dying(cpu))
return false;