mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 10:04:12 +08:00
325ea10c08
Do the following cleanups and simplifications: - sched/sched.h already includes <asm/paravirt.h>, so no need to include it in sched/core.c again. - order the <linux/sched/*.h> headers alphabetically - add all <linux/sched/*.h> headers to kernel/sched/sched.h - remove all unnecessary includes from the .c files that are already included in kernel/sched/sched.h. Finally, make all scheduler .c files use a single common header: #include "sched.h" ... which now contains a union of the relied upon headers. This makes the various .c files easier to read and easier to handle. Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
154 lines
4.0 KiB
C
154 lines
4.0 KiB
C
/*
|
|
* 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
|
|
* Copyright (C) 2017-2018 SUSE, Frederic Weisbecker
|
|
*
|
|
*/
|
|
#include "sched.h"
|
|
|
|
DEFINE_STATIC_KEY_FALSE(housekeeping_overriden);
|
|
EXPORT_SYMBOL_GPL(housekeeping_overriden);
|
|
static cpumask_var_t housekeeping_mask;
|
|
static unsigned int housekeeping_flags;
|
|
|
|
int housekeeping_any_cpu(enum hk_flags flags)
|
|
{
|
|
if (static_branch_unlikely(&housekeeping_overriden))
|
|
if (housekeeping_flags & flags)
|
|
return cpumask_any_and(housekeeping_mask, cpu_online_mask);
|
|
return smp_processor_id();
|
|
}
|
|
EXPORT_SYMBOL_GPL(housekeeping_any_cpu);
|
|
|
|
const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
|
|
{
|
|
if (static_branch_unlikely(&housekeeping_overriden))
|
|
if (housekeeping_flags & flags)
|
|
return housekeeping_mask;
|
|
return cpu_possible_mask;
|
|
}
|
|
EXPORT_SYMBOL_GPL(housekeeping_cpumask);
|
|
|
|
void housekeeping_affine(struct task_struct *t, enum hk_flags flags)
|
|
{
|
|
if (static_branch_unlikely(&housekeeping_overriden))
|
|
if (housekeeping_flags & flags)
|
|
set_cpus_allowed_ptr(t, housekeeping_mask);
|
|
}
|
|
EXPORT_SYMBOL_GPL(housekeeping_affine);
|
|
|
|
bool housekeeping_test_cpu(int cpu, enum hk_flags flags)
|
|
{
|
|
if (static_branch_unlikely(&housekeeping_overriden))
|
|
if (housekeeping_flags & flags)
|
|
return cpumask_test_cpu(cpu, housekeeping_mask);
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(housekeeping_test_cpu);
|
|
|
|
void __init housekeeping_init(void)
|
|
{
|
|
if (!housekeeping_flags)
|
|
return;
|
|
|
|
static_branch_enable(&housekeeping_overriden);
|
|
|
|
if (housekeeping_flags & HK_FLAG_TICK)
|
|
sched_tick_offload_init();
|
|
|
|
/* We need at least one CPU to handle housekeeping work */
|
|
WARN_ON_ONCE(cpumask_empty(housekeeping_mask));
|
|
}
|
|
|
|
static int __init housekeeping_setup(char *str, enum hk_flags flags)
|
|
{
|
|
cpumask_var_t non_housekeeping_mask;
|
|
int err;
|
|
|
|
alloc_bootmem_cpumask_var(&non_housekeeping_mask);
|
|
err = cpulist_parse(str, non_housekeeping_mask);
|
|
if (err < 0 || cpumask_last(non_housekeeping_mask) >= nr_cpu_ids) {
|
|
pr_warn("Housekeeping: nohz_full= or isolcpus= incorrect CPU range\n");
|
|
free_bootmem_cpumask_var(non_housekeeping_mask);
|
|
return 0;
|
|
}
|
|
|
|
if (!housekeeping_flags) {
|
|
alloc_bootmem_cpumask_var(&housekeeping_mask);
|
|
cpumask_andnot(housekeeping_mask,
|
|
cpu_possible_mask, non_housekeeping_mask);
|
|
if (cpumask_empty(housekeeping_mask))
|
|
cpumask_set_cpu(smp_processor_id(), housekeeping_mask);
|
|
} else {
|
|
cpumask_var_t tmp;
|
|
|
|
alloc_bootmem_cpumask_var(&tmp);
|
|
cpumask_andnot(tmp, cpu_possible_mask, non_housekeeping_mask);
|
|
if (!cpumask_equal(tmp, housekeeping_mask)) {
|
|
pr_warn("Housekeeping: nohz_full= must match isolcpus=\n");
|
|
free_bootmem_cpumask_var(tmp);
|
|
free_bootmem_cpumask_var(non_housekeeping_mask);
|
|
return 0;
|
|
}
|
|
free_bootmem_cpumask_var(tmp);
|
|
}
|
|
|
|
if ((flags & HK_FLAG_TICK) && !(housekeeping_flags & HK_FLAG_TICK)) {
|
|
if (IS_ENABLED(CONFIG_NO_HZ_FULL)) {
|
|
tick_nohz_full_setup(non_housekeeping_mask);
|
|
} else {
|
|
pr_warn("Housekeeping: nohz unsupported."
|
|
" Build with CONFIG_NO_HZ_FULL\n");
|
|
free_bootmem_cpumask_var(non_housekeeping_mask);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
housekeeping_flags |= flags;
|
|
|
|
free_bootmem_cpumask_var(non_housekeeping_mask);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int __init housekeeping_nohz_full_setup(char *str)
|
|
{
|
|
unsigned int flags;
|
|
|
|
flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU | HK_FLAG_MISC;
|
|
|
|
return housekeeping_setup(str, flags);
|
|
}
|
|
__setup("nohz_full=", housekeeping_nohz_full_setup);
|
|
|
|
static int __init housekeeping_isolcpus_setup(char *str)
|
|
{
|
|
unsigned int flags = 0;
|
|
|
|
while (isalpha(*str)) {
|
|
if (!strncmp(str, "nohz,", 5)) {
|
|
str += 5;
|
|
flags |= HK_FLAG_TICK;
|
|
continue;
|
|
}
|
|
|
|
if (!strncmp(str, "domain,", 7)) {
|
|
str += 7;
|
|
flags |= HK_FLAG_DOMAIN;
|
|
continue;
|
|
}
|
|
|
|
pr_warn("isolcpus: Error, unknown flag\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Default behaviour for isolcpus without flags */
|
|
if (!flags)
|
|
flags |= HK_FLAG_DOMAIN;
|
|
|
|
return housekeeping_setup(str, flags);
|
|
}
|
|
__setup("isolcpus=", housekeeping_isolcpus_setup);
|