非技术区
关于字节对齐的问题
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我也要 关注 + 加入社区/*
* Structures for I/O stats.
* These are now dynamically allocated.
*/
struct io_stats {
/* # of sectors read */
unsigned long rd_sectors __attribute__ ((aligned (8)));
/* # of sectors written */
unsigned long wr_sectors __attribute__ ((packed));
/* # of sectors discarded */
unsigned long dc_sectors __attribute__ ((packed));
/* # of read operations issued to the device */
unsigned long rd_ios __attribute__ ((packed));
/* # of read requests merged */
unsigned long rd_merges __attribute__ ((packed));
/* # of write operations issued to the device */
unsigned long wr_ios __attribute__ ((packed));
/* # of write requests merged */
unsigned long wr_merges __attribute__ ((packed));
/* # of discard operations issued to the device */
unsigned long dc_ios __attribute__ ((packed));
/* # of discard requests merged */
unsigned long dc_merges __attribute__ ((packed));
/* # of flush requests issued to the device */
unsigned long fl_ios __attribute__ ((packed));
/* Time of read requests in queue */
unsigned int rd_ticks __attribute__ ((packed));
/* Time of write requests in queue */
unsigned int wr_ticks __attribute__ ((packed));
/* Time of discard requests in queue */
unsigned int dc_ticks __attribute__ ((packed));
/* Time of flush requests in queue */
unsigned int fl_ticks __attribute__ ((packed));
/* # of I/Os in progress */
unsigned int ios_pgr __attribute__ ((packed));
/* # of ticks total (for this device) for I/O */
unsigned int tot_ticks __attribute__ ((packed));
/* # of ticks requests spent in queue */
unsigned int rq_ticks __attribute__ ((packed));
};
看代码的时候看到这种结构体，我不太明白这能起到什么作用，为什么要在这里设置字节对齐，以及在这个结构体中这个设置起到的作用是什么？？ 有什么特殊的意义吗。。。 平时写程序使用结构体基本上没有用过这种字节对齐，不太理解
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