参考内核5.x, 主要关注下资源释放。/**
* device_register - register a device with the system.
* @dev: pointer to the device structure
*
* This happens in two clean steps - initialize the device
* an...阅读全文
参考内核5.x,代码路径是在drivers/devfreq/,devfreq的代码定义是:Generic Dynamic Voltage and Frequency Scaling (DVFS) Framework for Non-CPU Devices。而CPU动态调频是drivers/cpufreq,devfreq是基于cpufreq而来。第一次引入这个特性描述: ...阅读全文
Android P环境,mkfs.erofs is required firstly. Let's build vendor.img with erofs format.build process for vendor with ext4看下vendor image with ext4过程:core/main.mk:1111:vendorimage: $(INSTALLE...阅读全文
参考staging erofs,on-disk inode layout相关实现是erofs_fs.h + super.c + inode.c。data mappings先看文档介绍:- Metadata & data could be mixed by design;Different from other read-only file systems, an EROF...阅读全文
mkfs.erofs is a user-space tool to create erofs filesystem images.erofs是华为为了增强安卓性能提出的自研文件系统,其内核文档提到用户态工具:The following git tree provides the file system user-spacetools under development ...阅读全文