kernel/sched/fair.c:9246:53: error: use of undeclared identifier 'select_idle_mask'

From: kernel test robot
Date: Wed Jun 22 2022 - 00:14:09 EST

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tree: https://github.com/intel-lab-lkp/linux/commits/Vincent-Donnefort/feec-energy-margin-removal/20220621-170631
head: 2059fff7a5a2b6016ef5843c673845283a00a646
commit: a4a1ec79913664ac49b72cda8c3756c4da7c16b4 sched/fair: Rename select_idle_mask to select_rq_mask
date: 19 hours ago
config: s390-randconfig-r044-20220622 (https://download.01.org/0day-ci/archive/20220622/202206221253.ZVyGQvPX-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 8b8d126598ce7bd5243da7f94f69fa1104288bee)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install s390 cross compiling tool for clang build
# apt-get install binutils-s390x-linux-gnu
# https://github.com/intel-lab-lkp/linux/commit/a4a1ec79913664ac49b72cda8c3756c4da7c16b4
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Vincent-Donnefort/feec-energy-margin-removal/20220621-170631
git checkout a4a1ec79913664ac49b72cda8c3756c4da7c16b4
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=s390 SHELL=/bin/bash kernel/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All errors (new ones prefixed by >>):

In file included from kernel/sched/fair.c:38:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:464:31: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __raw_readb(PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:477:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le16_to_cpu((__le16 __force)__raw_readw(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:37:59: note: expanded from macro '__le16_to_cpu'
#define __le16_to_cpu(x) __swab16((__force __u16)(__le16)(x))
^
include/uapi/linux/swab.h:102:54: note: expanded from macro '__swab16'
#define __swab16(x) (__u16)__builtin_bswap16((__u16)(x))
^
In file included from kernel/sched/fair.c:38:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:490:61: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
val = __le32_to_cpu((__le32 __force)__raw_readl(PCI_IOBASE + addr));
~~~~~~~~~~ ^
include/uapi/linux/byteorder/big_endian.h:35:59: note: expanded from macro '__le32_to_cpu'
#define __le32_to_cpu(x) __swab32((__force __u32)(__le32)(x))
^
include/uapi/linux/swab.h:115:54: note: expanded from macro '__swab32'
#define __swab32(x) (__u32)__builtin_bswap32((__u32)(x))
^
In file included from kernel/sched/fair.c:38:
In file included from include/linux/sched/isolation.h:6:
In file included from include/linux/tick.h:8:
In file included from include/linux/clockchips.h:14:
In file included from include/linux/clocksource.h:22:
In file included from arch/s390/include/asm/io.h:75:
include/asm-generic/io.h:501:33: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writeb(value, PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:511:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writew((u16 __force)cpu_to_le16(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:521:59: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
__raw_writel((u32 __force)cpu_to_le32(value), PCI_IOBASE + addr);
~~~~~~~~~~ ^
include/asm-generic/io.h:609:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:617:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:625:20: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
readsl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:634:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesb(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:643:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesw(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
include/asm-generic/io.h:652:21: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
writesl(PCI_IOBASE + addr, buffer, count);
~~~~~~~~~~ ^
kernel/sched/fair.c:5614:6: warning: no previous prototype for function 'init_cfs_bandwidth' [-Wmissing-prototypes]
void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
^
kernel/sched/fair.c:5614:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void init_cfs_bandwidth(struct cfs_bandwidth *cfs_b) {}
^
static
>> kernel/sched/fair.c:9246:53: error: use of undeclared identifier 'select_idle_mask'
struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_idle_mask);
^
>> kernel/sched/fair.c:9246:53: error: use of undeclared identifier 'select_idle_mask'
>> kernel/sched/fair.c:9246:53: error: use of undeclared identifier 'select_idle_mask'
>> kernel/sched/fair.c:9246:21: error: initializing 'struct cpumask *' with an expression of incompatible type 'void'
struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_idle_mask);
^ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/sched/fair.c:11151:6: warning: no previous prototype for function 'task_vruntime_update' [-Wmissing-prototypes]
void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi)
^
kernel/sched/fair.c:11151:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void task_vruntime_update(struct rq *rq, struct task_struct *p, bool in_fi)
^
static
kernel/sched/fair.c:11771:6: warning: no previous prototype for function 'free_fair_sched_group' [-Wmissing-prototypes]
void free_fair_sched_group(struct task_group *tg) { }
^
kernel/sched/fair.c:11771:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void free_fair_sched_group(struct task_group *tg) { }
^
static
kernel/sched/fair.c:11773:5: warning: no previous prototype for function 'alloc_fair_sched_group' [-Wmissing-prototypes]
int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
^
kernel/sched/fair.c:11773:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
^
static
kernel/sched/fair.c:11778:6: warning: no previous prototype for function 'online_fair_sched_group' [-Wmissing-prototypes]
void online_fair_sched_group(struct task_group *tg) { }
^
kernel/sched/fair.c:11778:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void online_fair_sched_group(struct task_group *tg) { }
^
static
kernel/sched/fair.c:11780:6: warning: no previous prototype for function 'unregister_fair_sched_group' [-Wmissing-prototypes]
void unregister_fair_sched_group(struct task_group *tg) { }
^
kernel/sched/fair.c:11780:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
void unregister_fair_sched_group(struct task_group *tg) { }
^
static
18 warnings and 4 errors generated.

vim +/select_idle_mask +9246 kernel/sched/fair.c

57abff067a08488 Vincent Guittot 2019-10-18 9103
57abff067a08488 Vincent Guittot 2019-10-18 9104 /*
57abff067a08488 Vincent Guittot 2019-10-18 9105 * find_idlest_group() finds and returns the least busy CPU group within the
57abff067a08488 Vincent Guittot 2019-10-18 9106 * domain.
57abff067a08488 Vincent Guittot 2019-10-18 9107 *
57abff067a08488 Vincent Guittot 2019-10-18 9108 * Assumes p is allowed on at least one CPU in sd.
57abff067a08488 Vincent Guittot 2019-10-18 9109 */
57abff067a08488 Vincent Guittot 2019-10-18 9110 static struct sched_group *
45da27732b0b9b7 Valentin Schneider 2020-04-15 9111 find_idlest_group(struct sched_domain *sd, struct task_struct *p, int this_cpu)
57abff067a08488 Vincent Guittot 2019-10-18 9112 {
57abff067a08488 Vincent Guittot 2019-10-18 9113 struct sched_group *idlest = NULL, *local = NULL, *group = sd->groups;
57abff067a08488 Vincent Guittot 2019-10-18 9114 struct sg_lb_stats local_sgs, tmp_sgs;
57abff067a08488 Vincent Guittot 2019-10-18 9115 struct sg_lb_stats *sgs;
57abff067a08488 Vincent Guittot 2019-10-18 9116 unsigned long imbalance;
57abff067a08488 Vincent Guittot 2019-10-18 9117 struct sg_lb_stats idlest_sgs = {
57abff067a08488 Vincent Guittot 2019-10-18 9118 .avg_load = UINT_MAX,
57abff067a08488 Vincent Guittot 2019-10-18 9119 .group_type = group_overloaded,
57abff067a08488 Vincent Guittot 2019-10-18 9120 };
57abff067a08488 Vincent Guittot 2019-10-18 9121
57abff067a08488 Vincent Guittot 2019-10-18 9122 do {
57abff067a08488 Vincent Guittot 2019-10-18 9123 int local_group;
57abff067a08488 Vincent Guittot 2019-10-18 9124
57abff067a08488 Vincent Guittot 2019-10-18 9125 /* Skip over this group if it has no CPUs allowed */
57abff067a08488 Vincent Guittot 2019-10-18 9126 if (!cpumask_intersects(sched_group_span(group),
57abff067a08488 Vincent Guittot 2019-10-18 9127 p->cpus_ptr))
57abff067a08488 Vincent Guittot 2019-10-18 9128 continue;
57abff067a08488 Vincent Guittot 2019-10-18 9129
97886d9dcd86820 Aubrey Li 2021-03-24 9130 /* Skip over this group if no cookie matched */
97886d9dcd86820 Aubrey Li 2021-03-24 9131 if (!sched_group_cookie_match(cpu_rq(this_cpu), p, group))
97886d9dcd86820 Aubrey Li 2021-03-24 9132 continue;
97886d9dcd86820 Aubrey Li 2021-03-24 9133
57abff067a08488 Vincent Guittot 2019-10-18 9134 local_group = cpumask_test_cpu(this_cpu,
57abff067a08488 Vincent Guittot 2019-10-18 9135 sched_group_span(group));
57abff067a08488 Vincent Guittot 2019-10-18 9136
57abff067a08488 Vincent Guittot 2019-10-18 9137 if (local_group) {
57abff067a08488 Vincent Guittot 2019-10-18 9138 sgs = &local_sgs;
57abff067a08488 Vincent Guittot 2019-10-18 9139 local = group;
57abff067a08488 Vincent Guittot 2019-10-18 9140 } else {
57abff067a08488 Vincent Guittot 2019-10-18 9141 sgs = &tmp_sgs;
57abff067a08488 Vincent Guittot 2019-10-18 9142 }
57abff067a08488 Vincent Guittot 2019-10-18 9143
57abff067a08488 Vincent Guittot 2019-10-18 9144 update_sg_wakeup_stats(sd, group, sgs, p);
57abff067a08488 Vincent Guittot 2019-10-18 9145
57abff067a08488 Vincent Guittot 2019-10-18 9146 if (!local_group && update_pick_idlest(idlest, &idlest_sgs, group, sgs)) {
57abff067a08488 Vincent Guittot 2019-10-18 9147 idlest = group;
57abff067a08488 Vincent Guittot 2019-10-18 9148 idlest_sgs = *sgs;
57abff067a08488 Vincent Guittot 2019-10-18 9149 }
57abff067a08488 Vincent Guittot 2019-10-18 9150
57abff067a08488 Vincent Guittot 2019-10-18 9151 } while (group = group->next, group != sd->groups);
57abff067a08488 Vincent Guittot 2019-10-18 9152
57abff067a08488 Vincent Guittot 2019-10-18 9153
57abff067a08488 Vincent Guittot 2019-10-18 9154 /* There is no idlest group to push tasks to */
57abff067a08488 Vincent Guittot 2019-10-18 9155 if (!idlest)
57abff067a08488 Vincent Guittot 2019-10-18 9156 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9157
7ed735c33104f3c Vincent Guittot 2019-12-04 9158 /* The local group has been skipped because of CPU affinity */
7ed735c33104f3c Vincent Guittot 2019-12-04 9159 if (!local)
7ed735c33104f3c Vincent Guittot 2019-12-04 9160 return idlest;
7ed735c33104f3c Vincent Guittot 2019-12-04 9161
57abff067a08488 Vincent Guittot 2019-10-18 9162 /*
57abff067a08488 Vincent Guittot 2019-10-18 9163 * If the local group is idler than the selected idlest group
57abff067a08488 Vincent Guittot 2019-10-18 9164 * don't try and push the task.
57abff067a08488 Vincent Guittot 2019-10-18 9165 */
57abff067a08488 Vincent Guittot 2019-10-18 9166 if (local_sgs.group_type < idlest_sgs.group_type)
57abff067a08488 Vincent Guittot 2019-10-18 9167 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9168
57abff067a08488 Vincent Guittot 2019-10-18 9169 /*
57abff067a08488 Vincent Guittot 2019-10-18 9170 * If the local group is busier than the selected idlest group
57abff067a08488 Vincent Guittot 2019-10-18 9171 * try and push the task.
57abff067a08488 Vincent Guittot 2019-10-18 9172 */
57abff067a08488 Vincent Guittot 2019-10-18 9173 if (local_sgs.group_type > idlest_sgs.group_type)
57abff067a08488 Vincent Guittot 2019-10-18 9174 return idlest;
57abff067a08488 Vincent Guittot 2019-10-18 9175
57abff067a08488 Vincent Guittot 2019-10-18 9176 switch (local_sgs.group_type) {
57abff067a08488 Vincent Guittot 2019-10-18 9177 case group_overloaded:
57abff067a08488 Vincent Guittot 2019-10-18 9178 case group_fully_busy:
5c339005f854fa7 Mel Gorman 2020-11-20 9179
5c339005f854fa7 Mel Gorman 2020-11-20 9180 /* Calculate allowed imbalance based on load */
5c339005f854fa7 Mel Gorman 2020-11-20 9181 imbalance = scale_load_down(NICE_0_LOAD) *
5c339005f854fa7 Mel Gorman 2020-11-20 9182 (sd->imbalance_pct-100) / 100;
5c339005f854fa7 Mel Gorman 2020-11-20 9183
57abff067a08488 Vincent Guittot 2019-10-18 9184 /*
57abff067a08488 Vincent Guittot 2019-10-18 9185 * When comparing groups across NUMA domains, it's possible for
57abff067a08488 Vincent Guittot 2019-10-18 9186 * the local domain to be very lightly loaded relative to the
57abff067a08488 Vincent Guittot 2019-10-18 9187 * remote domains but "imbalance" skews the comparison making
57abff067a08488 Vincent Guittot 2019-10-18 9188 * remote CPUs look much more favourable. When considering
57abff067a08488 Vincent Guittot 2019-10-18 9189 * cross-domain, add imbalance to the load on the remote node
57abff067a08488 Vincent Guittot 2019-10-18 9190 * and consider staying local.
57abff067a08488 Vincent Guittot 2019-10-18 9191 */
57abff067a08488 Vincent Guittot 2019-10-18 9192
57abff067a08488 Vincent Guittot 2019-10-18 9193 if ((sd->flags & SD_NUMA) &&
57abff067a08488 Vincent Guittot 2019-10-18 9194 ((idlest_sgs.avg_load + imbalance) >= local_sgs.avg_load))
57abff067a08488 Vincent Guittot 2019-10-18 9195 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9196
57abff067a08488 Vincent Guittot 2019-10-18 9197 /*
57abff067a08488 Vincent Guittot 2019-10-18 9198 * If the local group is less loaded than the selected
57abff067a08488 Vincent Guittot 2019-10-18 9199 * idlest group don't try and push any tasks.
57abff067a08488 Vincent Guittot 2019-10-18 9200 */
57abff067a08488 Vincent Guittot 2019-10-18 9201 if (idlest_sgs.avg_load >= (local_sgs.avg_load + imbalance))
57abff067a08488 Vincent Guittot 2019-10-18 9202 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9203
57abff067a08488 Vincent Guittot 2019-10-18 9204 if (100 * local_sgs.avg_load <= sd->imbalance_pct * idlest_sgs.avg_load)
57abff067a08488 Vincent Guittot 2019-10-18 9205 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9206 break;
57abff067a08488 Vincent Guittot 2019-10-18 9207
57abff067a08488 Vincent Guittot 2019-10-18 9208 case group_imbalanced:
57abff067a08488 Vincent Guittot 2019-10-18 9209 case group_asym_packing:
57abff067a08488 Vincent Guittot 2019-10-18 9210 /* Those type are not used in the slow wakeup path */
57abff067a08488 Vincent Guittot 2019-10-18 9211 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9212
57abff067a08488 Vincent Guittot 2019-10-18 9213 case group_misfit_task:
57abff067a08488 Vincent Guittot 2019-10-18 9214 /* Select group with the highest max capacity */
57abff067a08488 Vincent Guittot 2019-10-18 9215 if (local->sgc->max_capacity >= idlest->sgc->max_capacity)
57abff067a08488 Vincent Guittot 2019-10-18 9216 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9217 break;
57abff067a08488 Vincent Guittot 2019-10-18 9218
57abff067a08488 Vincent Guittot 2019-10-18 9219 case group_has_spare:
cb29a5c19d2d68a Mel Gorman 2022-05-20 9220 #ifdef CONFIG_NUMA
57abff067a08488 Vincent Guittot 2019-10-18 9221 if (sd->flags & SD_NUMA) {
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9222 int imb_numa_nr = sd->imb_numa_nr;
57abff067a08488 Vincent Guittot 2019-10-18 9223 #ifdef CONFIG_NUMA_BALANCING
57abff067a08488 Vincent Guittot 2019-10-18 9224 int idlest_cpu;
57abff067a08488 Vincent Guittot 2019-10-18 9225 /*
57abff067a08488 Vincent Guittot 2019-10-18 9226 * If there is spare capacity at NUMA, try to select
57abff067a08488 Vincent Guittot 2019-10-18 9227 * the preferred node
57abff067a08488 Vincent Guittot 2019-10-18 9228 */
57abff067a08488 Vincent Guittot 2019-10-18 9229 if (cpu_to_node(this_cpu) == p->numa_preferred_nid)
57abff067a08488 Vincent Guittot 2019-10-18 9230 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9231
57abff067a08488 Vincent Guittot 2019-10-18 9232 idlest_cpu = cpumask_first(sched_group_span(idlest));
57abff067a08488 Vincent Guittot 2019-10-18 9233 if (cpu_to_node(idlest_cpu) == p->numa_preferred_nid)
57abff067a08488 Vincent Guittot 2019-10-18 9234 return idlest;
cb29a5c19d2d68a Mel Gorman 2022-05-20 9235 #endif /* CONFIG_NUMA_BALANCING */
57abff067a08488 Vincent Guittot 2019-10-18 9236 /*
2cfb7a1b031b0e8 Mel Gorman 2022-02-08 9237 * Otherwise, keep the task close to the wakeup source
2cfb7a1b031b0e8 Mel Gorman 2022-02-08 9238 * and improve locality if the number of running tasks
2cfb7a1b031b0e8 Mel Gorman 2022-02-08 9239 * would remain below threshold where an imbalance is
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9240 * allowed while accounting for the possibility the
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9241 * task is pinned to a subset of CPUs. If there is a
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9242 * real need of migration, periodic load balance will
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9243 * take care of it.
57abff067a08488 Vincent Guittot 2019-10-18 9244 */
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9245 if (p->nr_cpus_allowed != NR_CPUS) {
f5b2eeb49991047 K Prateek Nayak 2022-04-07 @9246 struct cpumask *cpus = this_cpu_cpumask_var_ptr(select_idle_mask);
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9247
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9248 cpumask_and(cpus, sched_group_span(local), p->cpus_ptr);
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9249 imb_numa_nr = min(cpumask_weight(cpus), sd->imb_numa_nr);
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9250 }
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9251
cb29a5c19d2d68a Mel Gorman 2022-05-20 9252 imbalance = abs(local_sgs.idle_cpus - idlest_sgs.idle_cpus);
cb29a5c19d2d68a Mel Gorman 2022-05-20 9253 if (!adjust_numa_imbalance(imbalance,
cb29a5c19d2d68a Mel Gorman 2022-05-20 9254 local_sgs.sum_nr_running + 1,
f5b2eeb49991047 K Prateek Nayak 2022-04-07 9255 imb_numa_nr)) {
57abff067a08488 Vincent Guittot 2019-10-18 9256 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9257 }
cb29a5c19d2d68a Mel Gorman 2022-05-20 9258 }
cb29a5c19d2d68a Mel Gorman 2022-05-20 9259 #endif /* CONFIG_NUMA */
57abff067a08488 Vincent Guittot 2019-10-18 9260
57abff067a08488 Vincent Guittot 2019-10-18 9261 /*
57abff067a08488 Vincent Guittot 2019-10-18 9262 * Select group with highest number of idle CPUs. We could also
57abff067a08488 Vincent Guittot 2019-10-18 9263 * compare the utilization which is more stable but it can end
57abff067a08488 Vincent Guittot 2019-10-18 9264 * up that the group has less spare capacity but finally more
57abff067a08488 Vincent Guittot 2019-10-18 9265 * idle CPUs which means more opportunity to run task.
57abff067a08488 Vincent Guittot 2019-10-18 9266 */
57abff067a08488 Vincent Guittot 2019-10-18 9267 if (local_sgs.idle_cpus >= idlest_sgs.idle_cpus)
57abff067a08488 Vincent Guittot 2019-10-18 9268 return NULL;
57abff067a08488 Vincent Guittot 2019-10-18 9269 break;
57abff067a08488 Vincent Guittot 2019-10-18 9270 }
57abff067a08488 Vincent Guittot 2019-10-18 9271
57abff067a08488 Vincent Guittot 2019-10-18 9272 return idlest;
57abff067a08488 Vincent Guittot 2019-10-18 9273 }
57abff067a08488 Vincent Guittot 2019-10-18 9274

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