linux/kernel/sched/isolation.c

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/*
* Housekeeping management. Manage the targets for routine code that can run on
* any CPU: unbound workqueues, timers, kthreads and any offloadable work.
*
* Copyright (C) 2017 Red Hat, Inc., Frederic Weisbecker
*
*/
#include <linux/sched/isolation.h>
#include <linux/tick.h>
#include <linux/init.h>
#include <linux/kernel.h>
cpumask_var_t housekeeping_mask;
void __init housekeeping_init(void)
{
if (!tick_nohz_full_enabled())
return;
if (!alloc_cpumask_var(&housekeeping_mask, GFP_KERNEL)) {
WARN(1, "NO_HZ: Can't allocate not-full dynticks cpumask\n");
cpumask_clear(tick_nohz_full_mask);
tick_nohz_full_running = false;
return;
}
cpumask_andnot(housekeeping_mask,
cpu_possible_mask, tick_nohz_full_mask);
/* We need at least one CPU to handle housekeeping work */
WARN_ON_ONCE(cpumask_empty(housekeeping_mask));
}