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sched/topology: Enable EAS on SMP systems also

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Currently EAS gets disabled when the system has only symmetric CPUs.
For example, either the system is SMP or all big or little CPUs are
hotplugged out on a b.L system. EAS features are required for better
power and performance on systems with symmetric CPUs. So don't disable
EAS on symmetric systems. This is done by assigning sd_asym_cpucapacity
per-cpu pointer to the only available sched domain.

Change-Id: If08a162f652a6a73884481ebc60e940373dbf9e2
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>
This commit is contained in:
Pavankumar Kondeti 2019-07-03 13:54:04 +05:30 • committed by Satya Durga Srinivasu Prabhala
commit bf868a6f04
1 changed files with 16 additions and 0 deletions
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16
kernel/sched/topology.c
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@ -653,6 +653,22 @@ static void update_top_cache_domain(int cpu)
rcu_assign_pointer(per_cpu(sd_asym_packing, cpu), sd);
sd = lowest_flag_domain(cpu, SD_ASYM_CPUCAPACITY);
/*
* EAS gets disabled when there are no asymmetric capacity
* CPUs in the system. For example, all big CPUs are
* hotplugged out on a b.L system. We want EAS enabled
* all the time to get both power and perf benefits. So,
* lets assign sd_asym_cpucapacity to the only available
* sched domain. This is also important for a single cluster
* systems which wants to use EAS.
*
* Setting sd_asym_cpucapacity() to a sched domain which
* has all symmetric capacity CPUs is technically incorrect but
* works well for us in getting EAS enabled all the time.
*/
if (!sd)
sd = cpu_rq(cpu)->sd;
rcu_assign_pointer(per_cpu(sd_asym_cpucapacity, cpu), sd);
}