alivepea.me
那一颗花生一个程序员的博客
http://www.alivepea.me/
一个程序员的博客
http://www.alivepea.me/
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那一颗花生 | alivepea.me Reviews
https://alivepea.me
一个程序员的博客
alivepea.me
检测内核的堆栈溢出
http://www.alivepea.me/kernel/kernel-overflow
阅读 / 编程 / 内核 / GENTOO. Mount -t debugfs none /d # echo OVERFLOW /d/ provoke-crash/DIRECT. Echo 10 /sys/module/lkdtm/parameters/recur count # echo 1 /proc/sys/kernel/stack tracer enabled # cat stack trace. Echo CORRUPT STACK /d/provoke-crash/DIRECT [ 1320.195246] lkdtm: Performing direct entry CORRUPT STACK [ 1320.195681] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: c03383dc. EOF 2013.12.20.
内核Alsa之pcm
http://www.alivepea.me/kernel/alsa-pcm
阅读 / 编程 / 内核 / GENTOO. 常用的采样率如8KHz的人声， 44.1KHz的mp3音乐, 96Khz的蓝光音频。 Ioctl(SNDRV PCM IOCTL SW PARAMS). 设定参数pcm config.配置 runtime 的 sw para.切换到. Ioctl(SNDRV PCM IOCTL PREPARE). Ioctl(SNDRV PCM IOCTL WRITEI FRAMES). Ioctl(SNDRV PCM IOCTL PREPARE). Ioctl(SNDRV PCM IOCTL START). Ioctl(SNDRV PCM IOCTL DROP). Hw ptr appl ptr. Snd pcm update hw ptr0(). 它是将hw ofs转换成FIFO中 hw ptr的过程，同时处理环形缓冲区的回绕，没有中断，中断丢失等情况。 Snd pcm hw refine(substream, params). CONFIG SND VERBOSE PROCFS/CONFIG SND PCM XRUN DEBUG.
内核ASoC之path
http://www.alivepea.me/kernel/asoc-path
阅读 / 编程 / 内核 / GENTOO. ASoC的DAPM是怎么做到需要用户空间参与功耗最小的呢 以codec为例，它运行时的功耗 主要取决于 1. codec供电电压越低，功耗越低; 2. 将codec中没有使用的部件widget 下电禁用。 如上图，speaker右声道播放音频流时，流经与DAPM相关的widget snd soc dapm dai in. snd soc dapm dac. snd soc dapm mixer. snd soc dapm pga. snd soc dapm spk. Speaker播放音频时的通路Route . 在这条通路上的widget上电， 不在这条通路上的widget，即没有使用到的，都需要下电禁用。 上图中widget snd soc dapm pga. snd soc hp. 在耳机播放播放右声道音频流的通路Route . 在给widget 和 上 电之前，还要先让widget 和 下电。 Is connect output ep(). Is connect input ep(). EOF 2014.01.20.
Git管理多个远程仓库
http://www.alivepea.me/linux/git-subtree
阅读 / 编程 / 内核 / GENTOO. 640k ought to be enough for anybody. Bill Gates. Git remote add -f github https:/ github.com/tinyalsa/tinyalsa.git $ git remote add -f android https:/ android.googlesource.com/platform/external/tinyalsa. 主分支不显示远程分支的日志 $ git subtree add -P github - squash github/master # 为远程分支创建本地分支，可基于本地分支开发 $ git subtree split -P github -b github - annotate="(github)" $ git subtree add -P android - squash android/master $ git subtree split -P android -b android - annotate="(android)".
Gentoo下调试libc
http://www.alivepea.me/linux/gentoo-debug-libc
阅读 / 编程 / 内核 / GENTOO. 机器出现几次libc抛出 ‘heap corruption’ 的异常。 CFLAGS="$CFLAGS -ggdb3" CXXFLAGS="$CXXFLAGS -ggdb3" FEATURES="$FEATURES splitdebug installsources". Emerge debugedit # installsources 依赖debugedit # emerge -1 -q sys-libs/glibc file # /usr/lib/debug/lib64/libc-2.18.so.debug /usr/lib/debug/lib64/libc-2.18.so.debug: ELF 64-bit LSB shared object, x86-64, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.16, not stripped. Features后，portage将为 unstripped 的 glibc 保存到.
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