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Message-Id: <1586419076-6301-1-git-send-email-lirongqing@baidu.com>
Date: Thu, 9 Apr 2020 15:57:56 +0800
From: Li RongQing <lirongqing@...du.com>
To: peterz@...radead.org, frederic@...nel.org, tglx@...utronix.de,
mingo@...nel.org, linux-kernel@...r.kernel.org
Subject: [PATCH][RFC] sched/isolation: allow isolcpus and nohz_full for different cpus
when both isolcpus and nohz_full are set, their cpus must be
same now, in fact isolcpus and nohz_full are not related, and
different cpus are expected for some cases, for example, some
cores for polling threads wants to isolcpus, and some cores for
dedicated threads, only nohz_full is expected
Signed-off-by: Li RongQing <lirongqing@...du.com>
---
kernel/sched/isolation.c | 79 ++++++++++++++++++++++++++++++++----------------
1 file changed, 53 insertions(+), 26 deletions(-)
diff --git a/kernel/sched/isolation.c b/kernel/sched/isolation.c
index 008d6ac2342b..6e6be34bb796 100644
--- a/kernel/sched/isolation.c
+++ b/kernel/sched/isolation.c
@@ -11,7 +11,8 @@
DEFINE_STATIC_KEY_FALSE(housekeeping_overridden);
EXPORT_SYMBOL_GPL(housekeeping_overridden);
-static cpumask_var_t housekeeping_mask;
+static cpumask_var_t housekeeping_mask_isolcpus;
+static cpumask_var_t housekeeping_mask_nohz_full;
static unsigned int housekeeping_flags;
bool housekeeping_enabled(enum hk_flags flags)
@@ -20,12 +21,26 @@ bool housekeeping_enabled(enum hk_flags flags)
}
EXPORT_SYMBOL_GPL(housekeeping_enabled);
+static cpumask_var_t housekeeping_get_mask(enum hk_flags flags)
+{
+ if (flags & (HK_FLAG_DOMAIN | HK_FLAG_MANAGED_IRQ))
+ return housekeeping_mask_isolcpus;
+
+ /* set by isolcpus=nohz only */
+ if ((flags & HK_FLAG_TICK) && !(housekeeping_flags & HK_FLAG_RCU))
+ return housekeeping_mask_isolcpus;
+
+ return housekeeping_mask_nohz_full;
+}
+
int housekeeping_any_cpu(enum hk_flags flags)
{
+ cpumask_var_t housekeeping_mask;
int cpu;
if (static_branch_unlikely(&housekeeping_overridden)) {
if (housekeeping_flags & flags) {
+ housekeeping_mask = housekeeping_get_mask(flags);
cpu = sched_numa_find_closest(housekeeping_mask, smp_processor_id());
if (cpu < nr_cpu_ids)
return cpu;
@@ -41,7 +56,7 @@ const struct cpumask *housekeeping_cpumask(enum hk_flags flags)
{
if (static_branch_unlikely(&housekeeping_overridden))
if (housekeeping_flags & flags)
- return housekeeping_mask;
+ return housekeeping_get_mask(flags);
return cpu_possible_mask;
}
EXPORT_SYMBOL_GPL(housekeeping_cpumask);
@@ -49,16 +64,24 @@ EXPORT_SYMBOL_GPL(housekeeping_cpumask);
void housekeeping_affine(struct task_struct *t, enum hk_flags flags)
{
if (static_branch_unlikely(&housekeeping_overridden))
- if (housekeeping_flags & flags)
+ if (housekeeping_flags & flags) {
+ cpumask_var_t housekeeping_mask;
+
+ housekeeping_mask = housekeeping_get_mask(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_overridden))
- if (housekeeping_flags & flags)
+ if (housekeeping_flags & flags) {
+ cpumask_var_t housekeeping_mask;
+
+ housekeeping_mask = housekeeping_get_mask(flags);
return cpumask_test_cpu(cpu, housekeeping_mask);
+ }
return true;
}
EXPORT_SYMBOL_GPL(housekeeping_test_cpu);
@@ -74,10 +97,14 @@ void __init housekeeping_init(void)
sched_tick_offload_init();
/* We need at least one CPU to handle housekeeping work */
- WARN_ON_ONCE(cpumask_empty(housekeeping_mask));
+ if (housekeeping_mask_isolcpus)
+ WARN_ON_ONCE(cpumask_empty(housekeeping_mask_isolcpus));
+ if (housekeeping_mask_nohz_full)
+ WARN_ON_ONCE(cpumask_empty(housekeeping_mask_nohz_full));
}
-static int __init housekeeping_setup(char *str, enum hk_flags flags)
+static int __init housekeeping_setup(char *str, enum hk_flags flags,
+ cpumask_var_t *housekeeping_mask)
{
cpumask_var_t non_housekeeping_mask;
cpumask_var_t tmp;
@@ -92,25 +119,25 @@ static int __init housekeeping_setup(char *str, enum hk_flags flags)
}
alloc_bootmem_cpumask_var(&tmp);
- if (!housekeeping_flags) {
- alloc_bootmem_cpumask_var(&housekeeping_mask);
- cpumask_andnot(housekeeping_mask,
- cpu_possible_mask, non_housekeeping_mask);
-
- cpumask_andnot(tmp, cpu_present_mask, non_housekeeping_mask);
- if (cpumask_empty(tmp)) {
- pr_warn("Housekeeping: must include one present CPU, "
+ alloc_bootmem_cpumask_var(housekeeping_mask);
+ cpumask_andnot(*housekeeping_mask,
+ cpu_possible_mask, non_housekeeping_mask);
+
+ cpumask_andnot(tmp, cpu_present_mask, non_housekeeping_mask);
+ if (cpumask_empty(tmp)) {
+ pr_warn("Housekeeping: must include one present CPU, "
"using boot CPU:%d\n", smp_processor_id());
- __cpumask_set_cpu(smp_processor_id(), housekeeping_mask);
- __cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask);
- }
- } else {
- cpumask_andnot(tmp, cpu_present_mask, non_housekeeping_mask);
- if (cpumask_empty(tmp))
- __cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask);
- cpumask_andnot(tmp, cpu_possible_mask, non_housekeeping_mask);
- if (!cpumask_equal(tmp, housekeeping_mask)) {
- pr_warn("Housekeeping: nohz_full= must match isolcpus=\n");
+ __cpumask_set_cpu(smp_processor_id(), *housekeeping_mask);
+ __cpumask_clear_cpu(smp_processor_id(), non_housekeeping_mask);
+ }
+
+ /* cpus should match when both nohz_full and isolcpus
+ * with nohz are passed into kernel
+ */
+ if (housekeeping_flags & flags & HK_FLAG_TICK) {
+ if (!cpumask_equal(housekeeping_mask_nohz_full,
+ housekeeping_mask_isolcpus)) {
+ pr_warn("Housekeeping: nohz_full= must match isolcpus=nohz\n");
free_bootmem_cpumask_var(tmp);
free_bootmem_cpumask_var(non_housekeeping_mask);
return 0;
@@ -142,7 +169,7 @@ static int __init housekeeping_nohz_full_setup(char *str)
flags = HK_FLAG_TICK | HK_FLAG_WQ | HK_FLAG_TIMER | HK_FLAG_RCU | HK_FLAG_MISC;
- return housekeeping_setup(str, flags);
+ return housekeeping_setup(str, flags, &housekeeping_mask_nohz_full);
}
__setup("nohz_full=", housekeeping_nohz_full_setup);
@@ -177,6 +204,6 @@ static int __init housekeeping_isolcpus_setup(char *str)
if (!flags)
flags |= HK_FLAG_DOMAIN;
- return housekeeping_setup(str, flags);
+ return housekeeping_setup(str, flags, &housekeeping_mask_isolcpus);
}
__setup("isolcpus=", housekeeping_isolcpus_setup);
--
2.16.2
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