Keisuke Nishimura 47a3075109 sched/fair: Fix the decision for load balance ... [ Upstream commit 6d7e4782bc ] should_we_balance is called for the decision to do load-balancing. When sched ticks invoke this function, only one CPU should return true. However, in the current code, two CPUs can return true. The following situation, where b means busy and i means idle, is an example, because CPU 0 and CPU 2 return true. [0, 1] [2, 3] b b i b This fix checks if there exists an idle CPU with busy sibling(s) after looking for a CPU on an idle core. If some idle CPUs with busy siblings are found, just the first one should do load-balancing. Fixes: b1bfeab9b0 ("sched/fair: Consider the idle state of the whole core for load balance") Signed-off-by: Keisuke Nishimura <keisuke.nishimura@inria.fr> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Chen Yu <yu.c.chen@intel.com> Reviewed-by: Shrikanth Hegde <sshegde@linux.vnet.ibm.com> Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org> Link: https://lkml.kernel.org/r/20231031133821.1570861-1-keisuke.nishimura@inria.fr Signed-off-by: Sasha Levin <sashal@kernel.org>		2023-12-03 07:33:02 +01:00
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autogroup.c
autogroup.h
build_policy.c
build_utility.c
clock.c	Locking changes for v6.5:	2023-06-27 14:14:30 -07:00
completion.c	sched: add a few helpers to wake up tasks on the current cpu	2023-07-17 16:08:08 -07:00
core_sched.c
core.c	sched/core: Fix RQCF_ACT_SKIP leak	2023-11-28 17:19:59 +00:00
cpuacct.c
cpudeadline.c
cpudeadline.h
cpufreq_schedutil.c	cpufreq: schedutil: Update next_freq when cpufreq_limits change	2023-10-05 22:09:50 +02:00
cpufreq.c
cpupri.c	sched/rt: Fix live lock between select_fallback_rq() and RT push	2023-09-28 22:58:13 +02:00
cpupri.h
cputime.c
deadline.c	sched: Fix stop_one_cpu_nowait() vs hotplug	2023-11-20 11:58:52 +01:00
debug.c	sched/debug: Rename sysctl_sched_min_granularity to sysctl_sched_base_slice	2023-07-19 09:43:59 +02:00
fair.c	sched/fair: Fix the decision for load balance	2023-12-03 07:33:02 +01:00
features.h	sched/eevdf: Curb wakeup-preemption	2023-08-17 17:07:07 +02:00
idle.c	kernel/sched: Modify initial boot task idle setup	2023-09-19 10:48:04 +02:00
isolation.c
loadavg.c
Makefile
membarrier.c
pelt.c
pelt.h
psi.c	Linux 6.5-rc2	2023-07-19 09:43:25 +02:00
rt.c	sched: Fix stop_one_cpu_nowait() vs hotplug	2023-11-20 11:58:52 +01:00
sched-pelt.h
sched.h	Misc x86 cleanups.	2023-08-28 17:05:58 -07:00
smp.h	sched, smp: Trace smp callback causing an IPI	2023-03-24 11:01:29 +01:00
stats.c
stats.h
stop_task.c
swait.c	sched: add a few helpers to wake up tasks on the current cpu	2023-07-17 16:08:08 -07:00
topology.c	sched/topology: Fix sched_numa_find_nth_cpu() in CPU-less case	2023-11-20 11:58:51 +01:00
wait_bit.c
wait.c	sched: add a few helpers to wake up tasks on the current cpu	2023-07-17 16:08:08 -07:00