命令行参数方式

About 4 min

命令行参数方式

对用户态进程进行内存相关的检查时,除了接口调用方式还可以通过命令行方式进行内存统计、内存泄漏或内存完整性检查。

--mwatch:初始化内存调测功能,注册信号。内存调测信息将从串口输出;
--mrecord <f_path>:初始化内存调测功能,注册信号。内存调测信息将保存至f_path文件,若f_path创建失败,则内存调测信息将从串口输出
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在待调测的进程未退出时可使用信号机制获取对应信息:

kill -35 <pid> # 查看线程级堆内存占用
kill -36 <pid> # 检查是否存在堆内存泄漏
kill -37 <pid> # 检查堆内存头节点是否完整
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示例代码

代码功能:构造内存问题利用命令行方式进行内存调测。

#include <pthread.h>
#include <stdlib.h>
#include <stdio.h>

#define MALLOC_LEAK_SIZE  0x300

void func(void) {
    char *ptr = malloc(MALLOC_LEAK_SIZE);
    memset(ptr, '3', MALLOC_LEAK_SIZE);
}

int main()
{
    char *ptr = malloc(MALLOC_LEAK_SIZE);
    memset(ptr, '1', MALLOC_LEAK_SIZE);
    func();
    while (1);
}
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编译

参考接口调用一节

使用mwatch参数命令

OHOS # ./mem_check --mwatch // 利用task命令可以查到mem_check进程的pid为4
OHOS # 
OHOS # kill -35 4 // 查看堆内存统计信息
OHOS # 
==PID:4== Heap memory statistics(bytes):
    [Check point]:
        #00: <arm_signal_process+0x5c>[0x58dfc] -> /lib/libc.so

    [TID: 18, Used: 0x640]

==PID:4== Total heap: 0x640 byte(s), Peak: 0x640 byte(s)

OHOS # kill -36 4 // 检查是否存在堆内存泄漏
OHOS # 
==PID:4== Detected memory leak(s):
    [Check point]:
        #00: <check_leak+0x1c4>[0x2da4c] -> /lib/libc.so
        #01: <arm_signal_process+0x5c>[0x58dfc] -> /lib/libc.so

    [TID:18 Leak:0x320 byte(s)] Allocated from:
        #00: <main+0x14>[0x724] -> mem_check
        #01: <(null)+0x2555a9dc>[0x219dc] -> /lib/libc.so

    [TID:18 Leak:0x320 byte(s)] Allocated from:
        #00: <func+0x14>[0x6ec] -> mem_check
        #01: <main+0x30>[0x740] -> mem_check
        #02: <(null)+0x2555a9dc>[0x219dc] -> /lib/libc.so

==PID:4== SUMMARY: 0x640 byte(s) leaked in 2 allocation(s).

OHOS # kill -37 4 // 检查堆内存头节点的完整性
OHOS # 
Check heap integrity ok!
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调用栈解析

将调测信息保存至test.txt文件中,利用脚本进行解析,获取内存泄漏的具体行号。

$ ./parse_mem_info.sh test.txt mem_check
Compiler is [gcc/llvm]: llvm
Now using addr2line ...

==PID:4== Detected memory leak(s):
    [Check point]:
        #00: <check_leak+0x1c4>[0x2da4c] -> /lib/libc.so
        #01: <arm_signal_process+0x5c>[0x58dfc] -> /lib/libc.so

    [TID:18 Leak:0x320 byte(s)] Allocated from:
        #00: <main+0x14>[0x724] at /usr1/xxx/TEST_ELF/mem_check.c:14
        #01: <(null)+0x2555a9dc>[0x219dc] -> /lib/libc.so

    [TID:18 Leak:0x320 byte(s)] Allocated from:
        #00: <func+0x14>[0x6ec] at /usr1/xxx/TEST_ELF/mem_check.c:8
        #01: <main+0x30>[0x740] at /usr1/xxx/TEST_ELF/mem_check.c:19
        #02: <(null)+0x2555a9dc>[0x219dc] -> /lib/libc.so

==PID:4== SUMMARY: 0x640 byte(s) leaked in 2 allocation(s).
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使用mrecord参数命令

  1. 执行用户程序并指定记录内存调测信息的文件路径

    OHOS # ./mem_check --mrecord /storage/check.txt
    
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  2. 利用kill -35 <pid>统计内存信息,该信息将会输出到文件中,使用cat命令查看

    OHOS # kill -35 4
    OHOS # Memory statistics information saved in /storage/pid(4)_check.txt
    
    OHOS # cat /storage/pid(4)_check.txt
    
    ==PID:4== Heap memory statistics(bytes):
        [Check point]:
            #00: <arm_signal_process+0x5c>[0x5973c] -> /lib/libc.so
    
        [TID: 18, Used: 0x640]
    
    ==PID:4== Total heap: 0x640 byte(s), Peak: 0x640 byte(s)
    
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  3. 利用kill -36 <pid>校验内存完整性,该信息将会输出到文件中,使用cat命令查看

    OHOS # kill -36 4
    OHOS # Leak check information saved in /storage/pid(4)_check.txt
    
    OHOS # cat /storage/pid(4)_check.txt
    
    ==PID:4== Heap memory statistics(bytes):
        [Check point]:
            #00: <arm_signal_process+0x5c>[0x5973c] -> /lib/libc.so
    
        [TID: 18, Used: 0x640]
    
    ==PID:4== Total heap: 0x640 byte(s), Peak: 0x640 byte(s)
    
    ==PID:4== Detected memory leak(s):
        [Check point]:
            #00: <check_leak+0x1c4>[0x2e38c] -> /lib/libc.so
            #01: <arm_signal_process+0x5c>[0x5973c] -> /lib/libc.so
    
        [TID:18 Leak:0x320 byte(s)] Allocated from:
            #00: <main+0x14>[0x724] -> mem_check
            #01: <(null)+0x1fdd231c>[0x2231c] -> /lib/libc.so
    
        [TID:18 Leak:0x320 byte(s)] Allocated from:
            #00: <func+0x14>[0x6ec] -> mem_check
            #01: <main+0x30>[0x740] -> mem_check
            #02: <(null)+0x1fdd231c>[0x2231c] -> /lib/libc.so
    
    ==PID:4== SUMMARY: 0x640 byte(s) leaked in 2 allocation(s).
    
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  4. 利用kill -9 <pid>杀掉当前进程,进程退出后会默认校验内存完整性,该信息将会输出到文件中,使用cat命令查看

    OHOS # kill -9 4
    OHOS # Leak check information saved in /storage/pid(4)_check.txt
    
    Check heap integrity ok!
    
    OHOS # cat /storage/pid(4)_check.txt
    OHOS # 
    ==PID:4== Heap memory statistics(bytes):
        [Check point]:
            #00: <arm_signal_process+0x5c>[0x5973c] -> /lib/libc.so
    
        [TID: 18, Used: 0x640]
    
    ==PID:4== Total heap: 0x640 byte(s), Peak: 0x640 byte(s)
    
    ==PID:4== Detected memory leak(s):
        [Check point]:
            #00: <check_leak+0x1c4>[0x2e38c] -> /lib/libc.so
            #01: <arm_signal_process+0x5c>[0x5973c] -> /lib/libc.so
    
        [TID:18 Leak:0x320 byte(s)] Allocated from:
            #00: <main+0x14>[0x724] -> mem_check
            #01: <(null)+0x1fdd231c>[0x2231c] -> /lib/libc.so
    
        [TID:18 Leak:0x320 byte(s)] Allocated from:
            #00: <func+0x14>[0x6ec] -> mem_check
            #01: <main+0x30>[0x740] -> mem_check
            #02: <(null)+0x1fdd231c>[0x2231c] -> /lib/libc.so
    
    ==PID:4== SUMMARY: 0x640 byte(s) leaked in 2 allocation(s).
    
    ==PID:4== Detected memory leak(s):
        [Check point]:
            #00: <check_leak+0x1c4>[0x2e38c] -> /lib/libc.so
            #01: <exit+0x28>[0x11b2c] -> /lib/libc.so
    
        [TID:18 Leak:0x320 byte(s)] Allocated from:
            #00: <main+0x14>[0x724] -> mem_check
            #01: <(null)+0x1fdd231c>[0x2231c] -> /lib/libc.so
    
        [TID:18 Leak:0x320 byte(s)] Allocated from:
            #00: <func+0x14>[0x6ec] -> mem_check
            #01: <main+0x30>[0x740] -> mem_check
            #02: <(null)+0x1fdd231c>[0x2231c] -> /lib/libc.so
    
    ==PID:4== SUMMARY: 0x640 byte(s) leaked in 2 allocation(s).
    
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说明: 上述连续记录的信息会逐步追加到初始化时所指定的文件中,故最后cat文件时,文件中还包含历史记录的信息内容。