feat: L0-L1 支持Perf
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: NLiteOS2021 <dinglu@huawei.com>
Change-Id: Ieb9b7483c85d1495df7c55bc0027f4309dff9814
Showing
apps/perf/BUILD.gn
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apps/perf/Makefile
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apps/perf/include/option.h
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apps/perf/include/perf.h
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apps/perf/include/perf_list.h
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apps/perf/include/perf_record.h
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apps/perf/include/perf_stat.h
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apps/perf/src/main.c
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apps/perf/src/option.c
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apps/perf/src/perf.c
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apps/perf/src/perf_list.c
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apps/perf/src/perf_record.c
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apps/perf/src/perf_stat.c
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arch/arm/arm/src/pmu/armv7_pmu.c
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arch/arm/include/perf.h
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drivers/char/perf/BUILD.gn
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drivers/char/perf/Kconfig
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drivers/char/perf/Makefile
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drivers/char/perf/src/perf.c
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kernel/extended/perf/BUILD.gn
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kernel/extended/perf/Kconfig
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kernel/extended/perf/Makefile
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kernel/extended/perf/los_perf.c
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kernel/extended/perf/perf_pmu.c
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kernel/include/los_perf.h
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