6e0a3f10bb
1.【需求描述】：
L0-L1 支持Perf，提供2种模式的配置， 及3大类型的事件配置：
2种模式：计数模式（仅统计事件发生次数）、采样模式（收集上下文如任务ID、pc、backtrace等）。
3种事件类型：CPU硬件事件（cycle、branch、icache、dcache等）、OS软件事件（task switch、mux pend、irq等）、高精度周期事件（cpu clock）。
2.【方案描述】：
L0:
基于事件采样原理，以性能事件为基础，当事件发生时，相应的事件计数器溢出发生中断，在中断处理函数中记录事件信息，包括当前的pc、当前运 行的任务ID以及调用栈等信息。
L1:
新增perf字符设备，位于“dev/perf”，通过对设备节点的read\ioctl,实现用户态perf
BREAKING CHANGE:
1.新增一系列perf的对外API，位于los_perf.h中.
LOS_PerfInit配置采样数据缓冲区
LOS_PerfStart开启Perf采样
LOS_PerfStop停止Perf采样
LOS_PerfConfig配置Perf采样事件
LOS_PerfDataRead读取采样数据
LOS_PerfNotifyHookReg 注册采样数据缓冲区的钩子函数
LOS_PerfFlushHookReg 注册缓冲区刷cache的钩子
2. 用户态新增perf命令
【Usage】:
./perf [start] /[start id] Start perf.
./perf [stop] Stop perf.
./perf [read nBytes] Read nBytes raw data from perf buffer and print out.
./perf [list] List events to be used in -e.
./perf [stat] or [record] <option> <command>
-e, event selector. use './perf list' to list available events.
-p, event period.
-o, perf data output filename.
-t, taskId filter(whiltelist), if not set perf will sample all tasks.
-s, type of data to sample defined in PerfSampleType los_perf.h.
-P, processId filter(whiltelist), if not set perf will sample all processes.
-d, whether to prescaler (once every 64 counts), which only take effect on cpu cycle hardware event.
Close #I47I9A
Signed-off-by: LiteOS2021 <dinglu@huawei.com>
Change-Id: Ieb9b7483c85d1495df7c55bc0027f4309dff9814
38 lines
870 B
Plaintext
38 lines
870 B
Plaintext
config KERNEL_PERF
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bool "Enable Perf Feature"
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default n
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depends on KERNEL_EXTKERNEL
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select KERNEL_SMP_CALL if KERNEL_SMP
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help
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If you wish to build LiteOS with support for perf.
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choice
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prompt "Time-consuming Calc Methods"
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depends on KERNEL_PERF
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config PERF_CALC_TIME_BY_TICK
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bool "By Tick"
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config PERF_CALC_TIME_BY_CYCLE
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bool "By Cpu Cycle"
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endchoice
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config PERF_BUFFER_SIZE
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int "Perf Sampling Buffer Size"
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default 20480
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depends on KERNEL_PERF
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config PERF_HW_PMU
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bool "Enable Hardware Pmu Events for Sampling"
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default n
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depends on KERNEL_PERF
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config PERF_TIMED_PMU
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bool "Enable Hrtimer Period Events for Sampling"
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default n
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depends on KERNEL_PERF && HRTIMER_ENABLE
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config PERF_SW_PMU
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bool "Enable Software Events for Sampling"
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default y
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depends on KERNEL_PERF && KERNEL_HOOK |