| menu "MTK runqueue statistic calculation and CPU affinity" |
| |
| config MTK_SCHED_RQAVG_KS |
| bool "Enable runqueue statistic calculation used in kernel space operation" |
| depends on SMP |
| help |
| MTK ruqueue statistic kernel space CPUfreq governors, e.g., hotplug |
| TLP estimation, |
| heavy task detection and |
| per CPU load for kernel space CPUfreq governors |
| |
| config MTK_SCHED_RQAVG_US |
| bool "Enable runqueue staticsic calculation used in user space operation" |
| depends on SMP && HIGH_RES_TIMERS |
| help |
| TLP estimation for user space CPUfreq governors |
| |
| config MT_CPU_AFFINITY |
| bool "Enhance CPU affinity in hotplug" |
| depends on HOTPLUG_CPU |
| help |
| The CPU affinity library for Hotplug enhancement is to achieve set CPU |
| affinity without take care kernel behavior and to avoid affect the original |
| Linux design. |
| |
| endmenu |
| |
| menu "MT load balance and schedule enhancement" |
| config MT_LOAD_BALANCE_ENHANCEMENT |
| bool "mt load balance enhancement" |
| depends on SMP |
| default n |
| help |
| Mediatek aggressive load balance, include 1. wake up load balance, |
| 2. shorten the schedule migration cost and let the idle balance more aggregative, |
| 3. force ignore the cache hot when current rq is idle and src cpu have more |
| than 2 tasks, |
| 4. migrate heavy load_weight task as long as RT tasks exist in busy cpu |
| 5. when move tasks fil, force migration no matter cache-hot, |
| use mt_ignore_cachehot_in_idle. |
| |
| config MT_RT_SCHED |
| bool "mt RT scheduling enhancement for big.LITTLE" |
| depends on SCHED_HMP |
| default n |
| help |
| Mediatek big.LITTLE MP Scheduling for RT-class. Linux big.LITTLE MP Scheduling |
| for RT-class don’t aware the different processor power (A15/A7). That would |
| lead to priority inversion. We want to provide a solution to solve above problem |
| and let the user experience, and system performance to achieve the best condition |
| under the consideration with power-saving and following the policy of hotplug and |
| DVFS (do not UP processor forcedly). |
| |
| config MT_SCHED_INTEROP |
| bool "mtk scheduling interopation enhancement" |
| default n |
| help |
| Original Linux Design, RT & CFS do load balance seperatedly, |
| and let would result in unload balance. |
| that is, one CPU has more than 2 tasks, however, one CPU is IDLE |
| We make RT & CFS to check each other and make load more balance. |
| |
| config MT_SCHED_TRACE |
| bool "mt scheduling trace, output mtk schedule trace into FTRACE" |
| default n |
| help |
| Provide RT info via ftrace, |
| mt_sched_printf for scheduling module to output info and |
| RT scheduling info to ftrace, |
| including select_task_rq, check_preempt, find_lowest_rq. |
| Say no if not sure. |
| |
| config MT_SCHED_DEBUG |
| bool "mt scheduling log, also output the scheduling log into Kernel log" |
| depends on MT_SCHED_TRACE |
| default n |
| help |
| MTK scheduling log, add scheduling log into Kernel log. |
| Including print scheduler debug information at KE and print load balance |
| information at kernel log. |
| Say no if not sure. |
| |
| config MT_DEBUG_PREEMPT |
| bool "debug preempt, output the preempt enable/disable to FTRACE" |
| default n |
| help |
| Provide preempt debug. |
| Dump preempt disable/enable backtrace into ftrace. |
| Dump preempt count in kernel log. |
| Say no if not sure. |
| |
| endmenu |
| |
| menu "MTK Cluster MultiProcessor Scheduler" |
| config MTK_CPU_TOPOLOGY |
| bool "MTK cpu topology infrastructure" |
| depends on (64BIT && OF && SMP) || (ARM_CPU_TOPOLOGY && OF) |
| default n |
| help |
| Say N if you want to build up another wheel |
| sched_init -> cmp_cputopo_domain_seutp() |
| rest_init -> fork kernel_init -> kernel_init_freeable ... -> parse_dt_topology |
| we focus to build up cpu topology and domain before scheduler runs. |
| |
| config MTK_SCHED_CMP |
| bool "Enable CMP scheduler" |
| depends on SMP && SCHED_MC && MTK_CPU_TOPOLOGY |
| default n |
| help |
| CMP Scheduler Enhancement for MTK SoC. |
| Attempts to introspectively select tasks to optimize |
| energy and performance. |
| say no if not sure. |
| |
| config MTK_SCHED_CMP_TGS |
| bool "Enable thread group scheduling" |
| depends on MTK_SCHED_CMP |
| default n |
| help |
| CMP Scheduler Enhancement for MTK SoC. |
| To utilize the nature of tasks in the same thread group, which eager |
| to share data (pages) essentially. Balance the same parent’s tasks to |
| the same CPU cluster Would get improvement with L2-cache Read-Hit/Miss |
| and Write. |
| |
| config MTK_SCHED_CMP_TGS_WAKEUP |
| bool "Enable thread group scheduling" |
| depends on MTK_SCHED_CMP_TGS |
| default n |
| help |
| CMP Scheduler Enhancement for MTK SoC. |
| If the wakeup task is single thread, it will try to find idlest group |
| and find idlest CPU. Else if the wakeup task has thread group, prefer |
| the cluster which has idle CPU with most tasks in the same thread group. |
| |
| endmenu |
| |
| menu "MTK Heterogenous MultiProcessor Scheduler" |
| config DISABLE_CPU_SCHED_DOMAIN_BALANCE |
| bool "(EXPERIMENTAL) Disable CPU level scheduler load-balancing" |
| help |
| Disables scheduler load-balancing at CPU sched domain level. |
| In hmp scheduler, use hmp global balance, a.k.a. force up/down |
| migration, instead. |
| If unsure say N here. |
| |
| config SCHED_HMP |
| bool "(EXPERIMENTAL) Heterogenous multiprocessor scheduling" |
| depends on SCHED_MC && FAIR_GROUP_SCHED && !SCHED_AUTOGROUP |
| help |
| Experimental scheduler optimizations for heterogeneous platforms. |
| Attempts to introspectively select task affinity to optimize power |
| and performance. Basic support for multiple (>2) cpu types is in place, |
| but it has only been tested with two types of cpus. |
| There is currently no support for migration of task groups, hence |
| !SCHED_AUTOGROUP. |
| |
| config SCHED_HMP_PRIO_FILTER |
| bool "(EXPERIMENTAL) Filter HMP migrations by task priority" |
| help |
| Enables task priority based HMP migration filter. Any task with |
| a NICE value above the threshold will always be on low-power cpus |
| with less compute capacity. |
| If unsure say N here. |
| |
| config SCHED_HMP_PRIO_FILTER_VAL |
| int "NICE priority threshold" |
| default 5 |
| depends on SCHED_HMP_PRIO_FILTER |
| |
| config HMP_FREQUENCY_INVARIANT_SCALE |
| bool "(EXPERIMENTAL) Frequency-Invariant Tracked Load for HMP" |
| depends on !ARCH_SCALE_INVARIANT_CPU_CAPACITY |
| help |
| Scales the current load contribution in line with the frequency |
| of the CPU that the task was executed on. |
| In this version, we use a simple linear scale derived from the |
| maximum frequency reported by CPUFreq. |
| Restricting tracked load to be scaled by the CPU's frequency |
| represents the consumption of possible compute capacity |
| (rather than consumption of actual instantaneous capacity as |
| normal) and allows the HMP migration's simple threshold |
| migration strategy to interact more predictably with CPUFreq's |
| asynchronous compute capacity changes. |
| |
| config HMP_TRACER |
| bool "(EXPERIMENTAL) Profile HMP scheduler" |
| help |
| Profile HMP scheduler |
| Trace the update of cfs rq, load, and hmp_statisics to evaluate if |
| the schedule decision is as expected. |
| If unsure say N here. |
| |
| config HMP_PACK_SMALL_TASK |
| bool "(EXPERIMENTAL) Packing Small Tasks" |
| depends on SCHED_HMP |
| help |
| This option enables Packing Small Tasks |
| Packing small task mechanism is try to limit small tasks to run |
| on as little CPUs as possible and meke better power efficiency. |
| If unsure say N here. |
| |
| config SCHED_HMP_PLUS |
| bool "(EXPERIMENTAL) Corepilot enhancement" |
| depends on SCHED_HMP |
| default n |
| help |
| Corepilot hmp enhancement. |
| 1. Do hmp_idle_pull at idle_balance |
| 2. At global balance, consider the tasks in rq, move heaviest/lightest |
| of first 5 tasks in rq. |
| 3. Enhance down migration rule: Do not migrate task when big core |
| is idle |
| endmenu |
