2021-07-13 23:57:39 +08:00
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# Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved.
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# Copyright (c) 2020-2021 Huawei Device Co., Ltd. All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification,
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# are permitted provided that the following conditions are met:
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#
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# 1. Redistributions of source code must retain the above copyright notice, this list of
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# conditions and the following disclaimer.
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#
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# 2. Redistributions in binary form must reproduce the above copyright notice, this list
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# of conditions and the following disclaimer in the documentation and/or other materials
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# provided with the distribution.
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#
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# 3. Neither the name of the copyright holder nor the names of its contributors may be used
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# to endorse or promote products derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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# THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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import("//kernel/liteos_a/liteos.gni")
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group("drivers") {
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2021-07-27 16:46:30 +08:00
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deps = [
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"block/disk",
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"char/bch",
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"char/mem",
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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: LiteOS2021 <dinglu@huawei.com>
Change-Id: Ieb9b7483c85d1495df7c55bc0027f4309dff9814
2021-09-14 10:38:15 +08:00
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"char/perf",
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2021-07-27 16:46:30 +08:00
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"char/quickstart",
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"char/random",
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2021-08-31 16:36:04 +08:00
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"char/trace",
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2021-07-27 16:46:30 +08:00
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"char/video",
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"mtd/multi_partition",
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]
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2021-07-13 23:57:39 +08:00
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}
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config("public") {
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configs = [
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"block/disk:public",
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"char/bch:public",
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"char/mem:public",
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"char/quickstart:public",
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"char/random:public",
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"char/video:public",
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2021-08-31 16:36:04 +08:00
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"char/trace:public",
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2021-07-13 23:57:39 +08:00
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"mtd/multi_partition:public",
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]
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}
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